An experimental device and method for visualizing monitoring particle flow field distribution

Abstract

This invention relates to an experimental apparatus and method for visually monitoring particle flow field distribution. The apparatus includes a stirring unit, a zoned heating unit, a visual monitoring unit, an online concentration detection unit, a temperature monitoring unit, and a data processing and control unit. The data processing and control unit is electrically connected to the zoned heating unit, the visual monitoring unit, the online concentration detection unit, and the temperature monitoring unit, respectively, and is used to receive video data, solution concentration data, and temperature data, perform fusion analysis, determine the real-time mixing / dissolution state of the solid-liquid multiphase mixture, and dynamically adjust the stirring speed and / or zoned heating power according to the real-time mixing / dissolution state. This apparatus dynamically adjusts the stirring speed and zoned heating power based on video data, solution concentration data, and temperature data, improving energy utilization efficiency while ensuring mixing effect, avoiding misjudgments caused by single-point detection, and improving the reliability of process monitoring.

Description

Technical Field

[0001] This invention relates to the field of fluid mixing equipment technology, and in particular to an experimental apparatus and method for visually monitoring the distribution of particle flow fields. Background Technology

[0002] In numerous fields such as chemical engineering, pharmaceuticals, food processing, environmental protection, and materials preparation, solid-liquid mixing and dissolution processes are among the most common unit operations. As a core piece of equipment, the internal flow field of the stirring device directly determines the mixing efficiency, product quality, and energy consumption. However, traditional stirring devices are typically in a "black box" state during operation, meaning operators cannot intuitively and in real-time understand the movement trajectory, spatial distribution, suspension height, and sedimentation of solid particles inside the device.

[0003] To monitor the dissolution process, existing technologies typically install online concentration detection instruments (such as conductivity meters, refractometers, or densitometers) inside the device (e.g., at the bottom or sidewalls) to determine whether dissolution is complete by detecting the physicochemical properties of the solution at specific locations. However, existing technologies have drawbacks, including the inability to directly observe the movement of solid particles inside the device, the existence of mixing blind spots, and reliance on single-point detection, which can easily lead to misjudgments of the process endpoint. Summary of the Invention

[0004] This invention provides an experimental apparatus and method for visually monitoring the distribution of particle flow fields, in order to overcome at least one of the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions: In a first aspect, the present invention provides an experimental apparatus for visually monitoring the distribution of particle flow fields, comprising: The stirring device body is used to contain solid-liquid multiphase mixtures and provide a mixing space; The zoned heating unit includes multiple independently controllable heating zones arranged along the axial direction of the stirring device body, which are used to construct multiple flow field regions with different temperature characteristics within the stirring device body. A visual monitoring unit, facing the flow field area, is used to collect video data in real time of the motion trajectory, spatial distribution density, suspension height and deposition state of particles or tracer particles in the flow field area. An online concentration detection unit is installed inside the stirring device to collect solution concentration data at different locations in the flow field area in real time. The temperature monitoring unit includes multiple temperature sensors arranged along the axial direction of the stirring device body, used to collect temperature data at different locations in the flow field region in real time; The data processing and control unit is electrically connected to the partitioned heating unit, the visual monitoring unit, the online concentration detection unit, and the temperature monitoring unit, respectively. It is used to receive the video data, the solution concentration data, and the temperature data, extract the image features in the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of the particles or tracer particles, and perform fusion analysis with the solution concentration data and the temperature data to determine the real-time mixing / dissolution state of the solid-liquid multiphase mixture. It also dynamically adjusts the stirring speed and / or partitioned heating power according to the real-time mixing / dissolution state.

[0006] In one possible implementation of the first aspect, the stirring device body is a stirrer comprising multiple layers of stirring blades, and the partitioned heating unit is integrated into the multiple layers of stirring blade structure.

[0007] In one possible implementation of the first aspect, the stirring device body is a coaxial cylindrical rotating device comprising an inner cylinder and an outer cylinder, with an annular gap formed between the inner cylinder and the outer cylinder; the partitioned heating unit is integrated in the inner cylinder, and the visual monitoring unit faces the annular gap between the inner cylinder and the outer cylinder.

[0008] In one possible implementation of the first aspect, a supplementary lighting unit is also included for providing supplementary lighting to the flow field region.

[0009] In one possible implementation of the first aspect, the supplementary lighting unit is a brightness-adjustable light source and is located on the opposite side of the visual monitoring unit.

[0010] In one possible implementation of the first aspect, the online concentration detection unit includes multiple concentration sensors arranged at different heights along the side wall of the stirring device body for collecting solution concentration data at different locations in the flow field region.

[0011] In one possible implementation of the first aspect, the data processing and control unit includes an image processing module for extracting image features from the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of particles or tracer particles.

[0012] In one possible implementation of the first aspect, the data processing and control unit further includes a data fusion module for time-synchronizing and spatially aligning the image features, the solution concentration data, and the temperature data to evaluate the real-time mixing / dissolution state of the solid-liquid multiphase mixture.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention provides an experimental device for visually monitoring particle flow field distribution. By setting up a visual monitoring unit, it can capture and monitor the movement trajectory, spatial distribution density, suspension height and deposition state of solid particles inside the stirring device in real time, in situ and intuitively, filling the gap in the prior art where the movement state of solid particles inside the stirring device cannot be intuitively observed.

[0014] Furthermore, the experimental device for visually monitoring particle flow field distribution provided by this invention can construct multiple flow field regions with different temperature characteristics within the stirring device body by setting up a partitioned heating unit. This can be used to simulate and study the thermal stratification phenomenon that is widely present in nature and industrial processes, providing an experimental platform for multi-physics coupling research. Moreover, partitioned heating can accurately deliver heat to the area that needs to be heated, avoiding energy waste caused by overall heating, and can effectively shorten the overall process time by accelerating the rate-limiting step through local high temperature.

[0015] Furthermore, the experimental device for visually monitoring particle flow field distribution provided by this invention dynamically adjusts the stirring speed and zone heating power based on video data, solution concentration data, and temperature data to achieve closed-loop optimized control, thereby improving energy utilization efficiency while ensuring mixing effect. Moreover, by integrating video data, solution concentration data, and temperature data to construct a comprehensive judgment model, it avoids misjudgments caused by single-point detection and improves the reliability of process monitoring.

[0016] In a second aspect, the present invention also provides a method for visually monitoring the distribution of particulate flow fields, applicable to the experimental apparatus for visually monitoring the distribution of particulate flow fields in any implementation of the first aspect, the method comprising: Add the materials to be mixed into the mixing device, start the mixing and heating; The system utilizes a visual monitoring unit to collect video data of the flow field area in real time, an online concentration detection unit to collect solution concentration data at different locations in the flow field area in real time, and a temperature monitoring unit to collect temperature data at different locations in the flow field area in real time. The data processing and control unit extracts image features from the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of particles or tracer particles, and performs fusion analysis with the solution concentration data and the temperature data to determine the real-time mixing / dissolving state of the materials to be mixed. Based on the real-time mixing / dissolving state, the stirring speed and / or the zone heating power are dynamically adjusted.

[0017] In one possible implementation of the second aspect, the dynamic adjustment of stirring speed and / or zone heating power based on the real-time mixing / dissolving state includes: When the real-time mixing / dissolving state indicates uneven stirring or particle deposition, the stirring speed and / or the zone heating power of the corresponding area are increased. When the real-time mixing / dissolving state indicates that the materials to be mixed have been uniformly mixed, or the liquid in the flow field region has reached a predetermined solution concentration or the dissolution is complete, stirring and heating shall be stopped.

[0018] Understandably, the beneficial effects that the above-described method for visually monitoring particle flow field distribution can achieve can be found in the first aspect and any of its possible design methods, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an experimental device for visually monitoring the distribution of particle flow fields, provided in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the structure of an experimental device for visually monitoring the distribution of particle flow fields, provided in Embodiment 2 of the present invention. Figure 3 This is a flowchart illustrating a method for visually monitoring particle flow field distribution, provided as an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached diagram: 1-1, Stirring cylinder; 1-2, Stirring rod; 1-3, Stirring blade; 1-4, First speed-regulating motor; 1-5, Inner cylinder; 1-6, Outer cylinder; 1-7, Second speed-regulating motor; 2, Temperature control unit; 3, Visual monitoring unit; 4, Supplemental lighting unit; 5, Online concentration detection unit; 6, Temperature monitoring unit; 7, Data processing and control unit. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. In the description of the present invention, unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship. For example, A / B can represent A or B. The "or" in the present invention is merely a description of the relationship between the related objects, indicating that three relationships can exist. For example, A or B can represent: A alone, A and B simultaneously, and B alone. A and B can be singular or plural. Furthermore, in the description of the present invention, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items.

[0023] Furthermore, to facilitate a clear description of the technical solutions of the embodiments of the present invention, the terms "first" and "second" are used in the embodiments of the present invention to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0024] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as superior or more advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner for ease of understanding.

[0025] In numerous fields such as chemical engineering, pharmaceuticals, food processing, environmental protection, and materials preparation, solid-liquid mixing and dissolution processes are among the most common unit operations. As a core piece of equipment, the internal flow field of the stirring device directly determines the mixing efficiency, product quality, and energy consumption. However, traditional stirring devices are typically in a "black box" state during operation, meaning operators cannot intuitively and in real-time understand the movement trajectory, spatial distribution, suspension height, and sedimentation of solid particles inside the device.

[0026] To monitor the dissolution process, existing technologies typically install online concentration detection instruments (such as conductivity meters, refractometers, or densitometers) inside the device (e.g., at the bottom or sidewalls) to determine whether dissolution is complete by detecting the physicochemical properties of the solution at specific locations. However, existing technologies have drawbacks, including the inability to directly observe the movement of solid particles inside the device, the existence of mixing blind spots, and reliance on single-point detection, which can easily lead to misjudgments of the process endpoint.

[0027] In view of this, on the one hand, embodiments of the present invention provide an experimental device for visually monitoring particle flow field distribution, comprising: a stirring device body for accommodating a solid-liquid multiphase mixture and providing a mixing space; a zoned heating unit including multiple independently controllable heating zones arranged along the axial direction of the stirring device body for constructing multiple flow field regions with different temperature characteristics within the stirring device body; a visual monitoring unit facing the flow field regions for real-time acquisition of video data of the flow field regions; an online concentration detection unit disposed within the stirring device body for real-time acquisition of solution concentration data at different locations within the flow field regions; and a temperature monitoring unit including [missing information - likely a component or component] arranged along the axial direction of the stirring device body. Multiple temperature sensors are used to collect temperature data at different locations in the flow field region in real time. A data processing and control unit is electrically connected to the partitioned heating unit, the visual monitoring unit, the online concentration detection unit, and the temperature monitoring unit, respectively. It is used to receive the video data, the solution concentration data, and the temperature data, extract image features from the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of particles or tracer particles, and perform fusion analysis with the concentration data and the temperature data to determine the real-time mixing / dissolution state of the solid-liquid multiphase mixture. Based on the real-time mixing / dissolution state, the stirring speed and / or partitioned heating power are dynamically adjusted.

[0028] This invention provides an experimental device for visually monitoring particle flow field distribution. By setting up a visual monitoring unit, it can capture and monitor the movement trajectory, spatial distribution density, suspension height, and deposition state of solid particles inside the stirring device in real time, in situ, and intuitively, filling the gap in the prior art where the movement state of solid particles inside the stirring device cannot be directly observed. By setting up a zoned heating unit, multiple flow field regions with different temperature characteristics can be constructed within the stirring device. This can be used to simulate and study the thermal stratification phenomenon that is widely present in nature and industrial processes, providing an experimental platform for multi-physics coupling research. Moreover, zoned heating can accurately deliver heat to the areas that need to be heated, avoiding energy waste caused by overall heating. By accelerating the rate-limiting steps through local high temperatures, the overall process time can be effectively shortened. Based on video data, solution concentration data, and temperature data, the stirring speed and zoned heating power are dynamically adjusted to achieve closed-loop optimization control, improving energy utilization efficiency while ensuring mixing effect. Furthermore, by using integrated video data, solution concentration data, and temperature data to construct a comprehensive judgment model, it avoids misjudgment caused by single-point detection and improves the reliability of process monitoring.

[0029] The following description, in conjunction with the accompanying drawings, illustrates an experimental apparatus for visually monitoring particle flow field distribution provided by an embodiment of the present invention.

[0030] Example 1 like Figure 1 As shown, this embodiment of the invention provides an experimental apparatus for visually monitoring the distribution of particle flow fields, which may include, but is not limited to: The stirring device body is used to contain solid-liquid multiphase mixtures and provide a mixing space.

[0031] The stirring device body is specifically a stirrer structure, including a stirrer cylinder 1-1. Inside the stirrer cylinder 1-1 are a stirring rod 1-2 and stirring blades 1-3. The stirring blades 1-3 employ a multi-layer blade combination structure, and each layer of blades can be of different types, such as radial flow blades and axial flow blades from top to bottom, to generate a complex macroscopic flow field. One end of the stirring rod 1-2 is connected to a first speed-regulating motor 1-4, which drives the stirring blades 1-3 to rotate.

[0032] The zoned heating unit includes multiple independently controllable heating zones arranged along the axial direction of the stirring device body, used to construct multiple flow field regions with different temperature characteristics within the stirring device body.

[0033] Specifically, in this embodiment of the invention, the partitioned heating unit is integrated inside the stirring blade 1-3. For example, an insulated resistance wire can be encapsulated in the hollow stirring blade 1-3 and powered through the hollow stirring rod 1-2; alternatively, steam heating can be used, with the hollow stirring rod 1-2 and the stirring blade 1-3 forming a steam passage through which a heat medium (such as steam) flows to transfer heat, etc., without limitation. In this embodiment of the invention, the partitioned heating unit is divided into three independent heating zones (bottom heating zone, middle heating zone, and upper heating zone) along the axial direction of the stirrer cylinder 1-1. Each heating zone is regulated by an independent temperature control unit 2 (such as an SCR power regulator, bidirectional PID controller, etc.).

[0034] The visual monitoring unit 3 is oriented toward the flow field area and is used to collect video data of the flow field area in real time.

[0035] Specifically, the visual monitoring unit 3 in this embodiment of the invention may include, but is not limited to, a high-definition industrial camera, especially a high-definition industrial camera with automatic focusing and aperture optimization functions that can adapt to different lighting conditions. The number and setting position of the high-definition industrial camera are determined according to the size, shape and flow field monitoring requirements of the agitator cylinder 1-1. As long as its layout can fully cover the key flow field area of ​​the agitator cylinder 1-1, such as areas where there may be mixing dead corners or deposition risks, it is not limited here.

[0036] It should be noted that the high-definition industrial camera in this embodiment of the invention can be fixedly mounted on the agitator cylinder 1-1 or on other mounting brackets, as long as the high-definition industrial camera can cover the key flow field area of ​​the agitator cylinder 1-1. For example, when the agitator cylinder 1-1 is made of highly transparent glass, a mounting bracket can be set near the agitator cylinder 1-1, the high-definition industrial camera can be mounted on the mounting bracket, and the shooting angle of the high-definition industrial camera can be adjusted to cover the key flow field area of ​​the agitator cylinder 1-1. This split-type structural design facilitates the maintenance of the high-definition industrial camera.

[0037] In one feasible implementation, in order to ensure that the visual monitoring unit 3 can acquire clearer images / videos, the present invention embodiment further includes a supplementary lighting unit 4 for providing supplementary lighting to the flow field area.

[0038] In specific implementation, the supplementary lighting unit 4 in this embodiment of the invention may, but is not limited to, employ a high-brightness LED surface light source or a fiber optic cold light source. The brightness of the light source is adjustable to adapt to the imaging requirements of different solution turbidity, particle color, and lighting conditions. In a feasible implementation, the supplementary lighting unit 4 in this embodiment of the invention is preferably positioned on the opposite side of the visual monitoring unit 3. By positioning the supplementary lighting unit 4 on the opposite side of the visual monitoring unit 3, the contrast between particles and liquid can be enhanced using the shading method, making the particle edges more clearly distinguishable.

[0039] The online concentration detection unit 5 is installed inside the stirring device and is used to collect solution concentration data at different locations in the flow field area in real time.

[0040] Specifically, the online concentration detection unit 5 in this embodiment of the invention may include, but is not limited to, multiple concentration sensors. These multiple concentration sensors are arranged at different heights along the side wall of the stirrer cylinder 1-1 to collect solution concentration data at different locations within the flow field region. The concentration sensors in this embodiment of the invention are existing conventional sensors; the specific model and type are selected based on the characteristics of the mixture to be stirred, and are not limited here.

[0041] The temperature monitoring unit 6 includes multiple temperature sensors arranged along the axial direction of the stirring device body, used to collect temperature data at different locations in the flow field region in real time.

[0042] It should be noted that the temperature sensor in the embodiments of the present invention may be, but is not limited to, a thermistor, such as a PT100 platinum resistance thermometer, or a thermocouple, such as a K-type thermocouple, an S-type thermocouple, or an R-type thermocouple, etc., and is not limited thereto. Furthermore, the embodiments of the present invention provide at least one temperature sensor in each heating zone to obtain the real-time temperature of different heating zones.

[0043] The data processing and control unit 7 is electrically connected to the first speed-regulating motor 1-4, the zone heating unit (temperature control unit 2), the visual monitoring unit 3, the online concentration detection unit 5, and the temperature monitoring unit 6, respectively. It is used to receive the video data, the solution concentration data, and the temperature data, extract the image features in the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of the particles or tracer particles, and perform fusion analysis with the solution concentration data and the temperature data to determine the real-time mixing / dissolution state of the solid-liquid multiphase mixture. Based on the real-time mixing / dissolution state, it dynamically adjusts the stirring speed and / or the zone heating power.

[0044] In specific implementation, the data processing and control unit 7 in the embodiments of the present invention may, but is not limited to, adopt an integrated intelligent controller (such as a programmable automation controller, PAC), a high-performance industrial control computer (such as the AcceedNuvo-11000 series), etc., and is not limited here.

[0045] Based on the experimental apparatus for visually monitoring particle flow field distribution described above, this embodiment of the invention also provides a method for visually monitoring particle flow field distribution, such as... Figure 3 As shown, the method may include, but is not limited to: S1: Add the materials to be mixed into the mixing device, start the mixing and heating.

[0046] In the specific implementation process, the embodiments of the present invention can put a certain amount of materials to be mixed, such as salt particles and water, into the agitator cylinder 1-1. Then, the first speed-regulating motor 1-4 and the temperature control unit 2 are started, the stirring blades 1-3 begin to rotate, and the partition heating unit begins to heat.

[0047] S2: The visual monitoring unit collects video data of the flow field area in real time, the online concentration detection unit collects solution concentration data of the material to be mixed in real time, and the temperature monitoring unit collects temperature data of the flow field area in real time.

[0048] S3: Utilize the data processing and control unit to extract image features from the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of particles or tracer particles, and perform fusion analysis with the solution concentration data and the temperature data to determine the real-time mixing / dissolving state of the materials to be mixed, and dynamically adjust the stirring speed and / or zone heating power according to the real-time mixing / dissolving state.

[0049] In specific implementation, the data processing and control unit 7 in this embodiment of the invention can use edge detection and threshold segmentation algorithms to extract the contours of undissolved salt particles, calculate the spatial distribution density, suspension height, and bottom deposition area of ​​the particles, and obtain image features. Then, the image features are synchronized in time and aligned spatially with solution concentration data and temperature data, and input into a comprehensive judgment model for analysis to determine the real-time mixing / dissolution state of the materials to be mixed. Based on the real-time mixing / dissolution state, the stirring speed and / or zone heating power are dynamically adjusted.

[0050] In one feasible implementation, the dynamic adjustment of stirring speed and / or zone heating power based on the real-time mixing / dissolving state in this embodiment of the invention may include, but is not limited to: When the real-time mixing / dissolving state indicates uneven stirring or particle deposition, the stirring speed and / or the zone heating power of the corresponding area are increased. When the real-time mixing / dissolving state indicates that the materials to be mixed have been uniformly mixed or dissolved into the flow field region to reach a predetermined solution concentration or dissolution is complete, stirring and heating shall be stopped.

[0051] In specific implementation, the stirring speed adjustment logic in the embodiments of the present invention can be understood, but is not limited to, as follows: If the image features indicate that the bottom deposition area is greater than the set deposition area threshold A1 (e.g., 5% of the cylinder bottom area), indicating the presence of particle deposition, the data processing and control unit 7 outputs a command to increase the speed of the first speed-regulating motor 1-4 by 10% from the current value, and continuously monitors the change in deposition area. If the deposition area does not decrease within 30 seconds, the speed is increased by another 10% until the deposition area is less than A1.

[0052] If the rate of change of solution concentration (dc / dt) is lower than the preset rate of change of solution concentration C1 (e.g., 0.1% / min), and the image features show that there are still many suspended particles, then it is judged to be in the diffusion control stage, and the rotation speed is appropriately increased by 5-15% to enhance turbulent diffusion.

[0053] If the particle distribution uniformity index is greater than the set uniformity threshold U1 (e.g., 0.9), the current rotation speed will be maintained to avoid unnecessary energy consumption.

[0054] The adjustment logic for zoned heating in the embodiments of the invention can be understood, but is not limited to, as follows: If the bottom area concentration sensor reading is lower than 90% of the predetermined solution concentration, and the image features show obvious deposition at the bottom, then the bottom heating zone is activated, the temperature is set to be 5°C higher than the current solution temperature, and maintained until the bottom solution concentration reaches 95% of the predetermined solution concentration.

[0055] If the particles in the middle or upper region are not dissolved sufficiently (based on the image features, the particle size is greater than the set value or the detection concentration is not up to standard), the heating zone in the corresponding region will be activated, and the set temperature will be increased by 3-8°C to improve the local dissolution rate.

[0056] Once the solution concentration in all areas has reached the predetermined concentration, gradually reduce the heating power to avoid overshoot.

[0057] The synchronization control strategy in the embodiments of the present invention can be understood, but is not limited to, as follows: When the particle dissolution efficiency does not meet the requirements, the stirring speed is adjusted first to promote particle suspension (physical effect). If adjusting the speed still does not significantly improve the situation, the local temperature is then adjusted (chemical / thermodynamic effect). For example, the stirring speed and temperature in the target area can be increased simultaneously, but the increase in stirring speed should precede the increase in temperature. This decoupled control avoids product denaturation or energy waste caused by overheating.

[0058] In the specific implementation process, the data fusion analysis in the embodiments of the present invention can be understood as follows: The data processing and control unit 7 collects the following data at fixed time intervals (e.g., 0.5 seconds): Image features: number of particles, average particle size, suspension height, deposition area, and distribution uniformity index; Solution concentration data: Concentration values ​​at three heights: bottom, middle, and top; Temperature data: Temperature values ​​at three heights: bottom, middle, and top.

[0059] The data fusion module first aligns the timestamps of various data types and uses linear interpolation to unify data from different sampling rates onto the same time axis. Then, it spatially correlates the solution concentration and temperature values ​​measured by each sensor with the image features of the corresponding height regions.

[0060] The comprehensive judgment model in this embodiment of the invention adopts a weighted scoring method: Visual score V: When the area of ​​undissolved particles detected is <0.1%, V=1; when the area is between 0.1% and 1%, V=0.5; when the area is >1%, V=0.

[0061] Concentration stability score C: Calculate the standard deviation of the concentration sensor readings at each altitude over the most recent 5 minutes. If the standard deviation is <0.2% (w / w), then C=1; if the standard deviation is between 0.2% and 0.5%, then C=0.5; if the standard deviation is >0.5%, then C=0.

[0062] Concentration compliance score S: S=1 when the readings of all high-concentration sensors reach more than 98% of the predetermined solution concentration; otherwise, S=0.

[0063] The data processing and control unit 7 determines that dissolution is complete and outputs a stop signal if and only if V=1, C=1 and S=1.

[0064] During the dissolution process, the data processing and control unit 7 displays the change curves of the above indicators in real time and stores the original images and sensor data for subsequent process optimization and analysis.

[0065] Example 2 This invention provides an experimental apparatus for visually monitoring the distribution of particulate flow fields, which may include, but is not limited to: The stirring device body is used to contain solid-liquid multiphase mixtures and provide a mixing space.

[0066] The stirring device body is specifically a coaxial cylindrical rotating device, including an inner cylinder 1-5 and an outer cylinder 1-6. The inner cylinder 1-5 is driven to rotate by a second speed-regulating motor 1-7, and the outer cylinder 1-6 is fixed. An annular gap is formed between the inner cylinder 1-5 and the outer cylinder 1-6.

[0067] The zoned heating unit includes multiple independently controllable heating zones arranged along the axial direction of the stirring device body, used to construct multiple flow field regions with different temperature characteristics within the stirring device body.

[0068] Specifically, in this embodiment of the invention, the partitioned heating unit is integrated into the inner cylinder 1-5, for example, by mounting a heating plate on the inner or outer wall of the inner cylinder 1-5, which is not limited here. In this embodiment of the invention, the partitioned heating unit is divided into three independent heating zones (zone I, zone II, and zone III) along the axial direction of the inner cylinder 1-5, and each heating zone is regulated by an independent temperature control unit 2 (such as an SCR power regulator, a bidirectional PID controller, etc.).

[0069] The visual monitoring unit 3 faces the annular gap between the inner cylinder 1-5 and the outer cylinder 1-6, and is used to capture in real time the formation and evolution of fluid flow within the annular gap, as well as the movement trajectory of particles with the fluid flow.

[0070] Specifically, the visual monitoring unit 3 in this embodiment of the invention may include, but is not limited to, a high-definition industrial camera, especially a high-definition industrial camera with autofocus and aperture optimization functions that can adapt to different lighting conditions. The number and setting position of the high-definition industrial camera are determined according to the size, shape and flow field monitoring requirements of the outer cylinder 1-6 and the inner cylinder 1-5. As long as its layout can fully cover the annular gap, it is not limited here.

[0071] It should be noted that the high-definition industrial camera in this embodiment of the invention can be fixedly mounted on the outer cylinder 1-6 or on other mounting brackets, as long as the high-definition industrial camera can cover the annular gap between the outer cylinder 1-6 and the inner cylinder 1-5. For example, when the outer cylinder 1-6 is made of highly transparent glass, a mounting bracket can be set near the outer cylinder 1-6, the high-definition industrial camera can be mounted on the mounting bracket, and the shooting angle of the high-definition industrial camera can be adjusted to cover the annular gap between the outer cylinder 1-6 and the inner cylinder 1-5. This split-type structural design facilitates the maintenance of the high-definition industrial camera.

[0072] In one feasible implementation, in order to ensure that the visual monitoring unit 3 can acquire clearer images / videos, the present invention embodiment further includes a supplementary lighting unit 4 for providing supplementary lighting to the flow field area.

[0073] In specific implementation, the supplementary lighting unit 4 in this embodiment of the invention may, but is not limited to, employ a high-brightness LED surface light source or a fiber optic cold light source. The brightness of the light source is adjustable to adapt to the imaging requirements of different solution turbidity, particle color, and lighting conditions. In a feasible implementation, the supplementary lighting unit 4 in this embodiment of the invention is preferably positioned on the opposite side of the visual monitoring unit 3. By positioning the supplementary lighting unit 4 on the opposite side of the visual monitoring unit 3, the contrast between particles and liquid can be enhanced using the shading method, making the particle edges more clearly distinguishable.

[0074] The online concentration detection unit 5 is installed inside the stirring device and is used to collect solution concentration data at different locations in the flow field area in real time.

[0075] Specifically, the online concentration detection unit 5 in this embodiment of the invention may include, but is not limited to, multiple concentration sensors. These multiple concentration sensors are arranged at different heights along the inner sidewall of the outer cylinder 1-6 to acquire solution concentration distribution information. The concentration sensors in this embodiment of the invention are existing conventional sensors; the specific model and type are selected according to the characteristics of the mixture to be stirred, and are not limited here.

[0076] The temperature monitoring unit 6 includes multiple temperature sensors arranged along the axial direction of the stirring device body, used to collect temperature data at different locations in the flow field region in real time.

[0077] It should be noted that the temperature sensor in the embodiments of the present invention may be, but is not limited to, a thermistor, such as a PT100 platinum resistance thermometer, or a thermocouple, such as a K-type thermocouple, an S-type thermocouple, or an R-type thermocouple, etc., and is not limited thereto. Furthermore, the embodiments of the present invention provide at least one temperature sensor in each heating zone to obtain the real-time temperature of different heating zones.

[0078] The data processing and control unit 7 is electrically connected to the second speed-regulating motor 1-7, the partitioned heating unit (temperature control unit 2), the visual monitoring unit 3, the online concentration detection unit 5, and the temperature monitoring unit 6, respectively. It is used to receive the video data, the solution concentration data, and the temperature data, extract the image features in the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of the particles or tracer particles, and perform fusion analysis with the solution concentration data and the temperature data to determine the real-time mixing / dissolution state of the solid-liquid multiphase mixture. Based on the real-time mixing / dissolution state, it dynamically adjusts the stirring speed and / or the partitioned heating power.

[0079] In specific implementation, the data processing and control unit 7 in the embodiments of the present invention may, but is not limited to, adopt an integrated intelligent controller (such as a programmable automation controller, PAC), a high-performance industrial control computer (such as the AcceedNuvo-11000 series), etc., and is not limited here.

[0080] The working process of the experimental device for visually monitoring particle flow field distribution provided in this embodiment of the invention is as follows: Fluid containing tracer particles is introduced into the annular gap between the inner cylinder 1-5 and the outer cylinder 1-6. The second speed-regulating motor 1-7 is started to rotate the inner cylinder 1-5, and the trajectory of the tracer particles is observed. At the same time, the temperature of the three heating zones is independently controlled according to experimental needs, creating a vertical temperature gradient within the annular gap.

[0081] The visual monitoring unit 3 acquires images of the annular gap in real time, and the data processing and control unit 7 uses the particle image velocimetry (PIV) algorithm to analyze the particle's trajectory and velocity field. The online concentration detection unit 5 and the temperature monitoring unit 6 acquire solution concentration data and temperature data, respectively.

[0082] When particle deposition is observed, the data processing and control unit 7 can automatically adjust the rotation speed of the inner cylinders 1-5 or adjust the heating power of the zones to promote particle suspension. All monitoring data is stored for subsequent analysis.

[0083] The embodiments of this invention can not only intuitively study the effect of temperature gradient on particle dissolution, but also analyze the suspension, transport and deposition behavior of particles through particle tracking technology, providing flow field visualization monitoring and intelligent control means for industrial applications such as rotating motor heat dissipation optimization, rotating filter performance improvement and bioreactor process enhancement.

[0084] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An experimental apparatus for visually monitoring the distribution of particle flow fields, characterized in that, include: The stirring device body is used to contain solid-liquid multiphase mixtures and provide a mixing space; The zoned heating unit includes multiple independently controllable heating zones arranged along the axial direction of the stirring device body, which are used to construct multiple flow field regions with different temperature characteristics within the stirring device body. A visual monitoring unit, facing the flow field area, is used to collect video data of the flow field area in real time; An online concentration detection unit is installed inside the stirring device to collect solution concentration data at different locations in the flow field area in real time. The temperature monitoring unit includes multiple temperature sensors arranged along the axial direction of the stirring device body, used to collect temperature data at different locations in the flow field region in real time; The data processing and control unit is electrically connected to the partitioned heating unit, the visual monitoring unit, the online concentration detection unit, and the temperature monitoring unit, respectively. It is used to receive the video data, the solution concentration data, and the temperature data, extract the image features in the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of the particles or tracer particles, and perform fusion analysis with the solution concentration data and the temperature data to determine the real-time mixing / dissolution state of the solid-liquid multiphase mixture. Based on the real-time mixing / dissolution state, it dynamically adjusts the stirring speed and / or the partitioned heating power.

2. The experimental apparatus for visually monitoring particle flow field distribution according to claim 1, characterized in that, The stirring device body is a stirrer including a multi-layer stirring blade structure, and the zoned heating unit is integrated into the multi-layer stirring blade structure.

3. The experimental apparatus for visually monitoring particle flow field distribution according to claim 1, characterized in that, The stirring device body is a coaxial cylindrical rotating device including an inner cylinder and an outer cylinder, with an annular gap formed between the inner cylinder and the outer cylinder; the partition heating unit is integrated in the inner cylinder, and the visual monitoring unit faces the annular gap between the inner cylinder and the outer cylinder.

4. The experimental apparatus for visually monitoring particle flow field distribution according to claim 1, characterized in that, It also includes a supplementary lighting unit for providing supplementary lighting to the flow field region.

5. The experimental apparatus for visually monitoring particle flow field distribution according to claim 4, characterized in that, The supplementary lighting unit is an adjustable light source and is located on the opposite side of the visual monitoring unit.

6. The experimental apparatus for visually monitoring particle flow field distribution according to claim 1, characterized in that, The online concentration detection unit includes multiple concentration sensors arranged at different heights along the side wall of the stirring device body, used to collect solution concentration data at different locations in the flow field region.

7. The experimental apparatus for visually monitoring particle flow field distribution according to claim 1, characterized in that, The data processing and control unit includes an image processing module for extracting image features from the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of particles or tracer particles.

8. The experimental apparatus for visually monitoring particle flow field distribution according to claim 7, characterized in that, The data processing and control unit also includes a data fusion module, which is used to synchronize and align the image features, solution concentration data and temperature data in time and space to evaluate the real-time mixing / dissolution state of the solid-liquid multiphase mixture.

9. A method for visually monitoring the distribution of particulate flow fields, applied to the experimental apparatus for visually monitoring the distribution of particulate flow fields as described in any one of claims 1 to 8, characterized in that, include: Add the materials to be mixed into the mixing device, start the mixing and heating; The system utilizes a visual monitoring unit to collect video data of the flow field area in real time, an online concentration detection unit to collect solution concentration data at different locations in the flow field area in real time, and a temperature monitoring unit to collect temperature data at different locations in the flow field area in real time. The data processing and control unit extracts image features from the video data that characterize the motion trajectory, spatial distribution density, suspension height, and deposition state of particles or tracer particles, and performs fusion analysis with the concentration data and the temperature data to determine the real-time mixing / dissolving state of the materials to be mixed. Based on the real-time mixing / dissolving state, the stirring speed and / or the zone heating power are dynamically adjusted.

10. The method for visually monitoring particle flow field distribution according to claim 9, characterized in that, The step of dynamically adjusting the stirring speed and / or the zone heating power based on the real-time mixing / dissolving state includes: When the real-time mixing / dissolving state indicates uneven stirring or particle deposition, the stirring speed and / or the zone heating power of the corresponding area are increased. When the real-time mixing / dissolving state indicates that the materials to be mixed have been uniformly mixed or dissolved into the flow field region to reach a predetermined solution concentration or dissolution is complete, stirring and heating shall be stopped.

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