Multiphase flow microscopic imaging measurement system based on particle imaging technology

Abstract

The utility model relates to the technical field of multiphase flow measurement, and discloses a multiphase flow microscopic imaging measurement system based on a particle imaging technology, which comprises a multiphase flow injection system, a microscopic chip, a waste collection system, an optical system, an image acquisition system and an image processing system, the optical system is arranged below the microchip, the image acquisition system is arranged above the microchip, and the image processing system is connected with the image acquisition system. According to the utility model, through illumination of the optical system, multi-channel synchronous control of the microcosmic chip and shooting of the accurate image acquisition system, high-resolution nano particle images can be obtained, and the system is suitable for accurate measurement and analysis of multiphase flow in scientific research and industrial application, and has the advantages of high precision and high efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to multiphase flow measurement technical field, concretely relates to a kind of multiphase flow microscopic imaging measurement system based on particle imaging technology. BACKGROUND

[0002] Multiphase flow widely exists in nature and industrial system, its flow characteristics are complex, and the interaction between each phase makes accurate measurement difficult, such as the interface interaction of gas-liquid two-phase, solid-liquid two-phase particle sedimentation, etc. In the fields of petroleum, chemical industry, environmental engineering, pharmaceutical and biomedical, understanding and controlling multiphase flow are crucial, for example, in oil and gas transportation, the phase distribution and flow rate of gas-liquid mixed flow have a significant impact on pipeline design. Microscopic imaging measurement is widely used in multiphase flow research, especially in microfluidics and nanotechnology fields. With the emergence of high-resolution microscopic imaging systems, researchers can observe the internal structure, interface changes and detailed particle motion of multiphase fluid at the microscopic scale, thus obtaining the microscopic flow characteristics of multiphase fluid. This provides reliable basic data for revealing the flow mechanism, interaction law of fluid and optimizing design. Particle imaging velocimetry (PIV) and particle tracking velocimetry (PTV) are optical imaging-based measurement methods that provide a non-contact flow field measurement method. Among them, PIV technology adds tiny particles to the fluid, uses high-resolution imaging equipment to capture particle motion, and thus obtains the velocity distribution of the fluid. PTV technology tracks the motion trajectory of a single particle and is suitable for more sparse multiphase flow systems. These technologies can provide higher resolution and higher accuracy flow field data compared to traditional methods. These technologies can measure the velocity and flow pattern of particles in the fluid to some extent, but are limited by optical resolution and measurement accuracy at the microscopic scale. In addition, many multiphase flow systems often exhibit high speed and non-linear characteristics, making it difficult for traditional methods and systems to obtain clear and continuous particle motion data, affecting the accuracy of measurement. In view of the above problems, a new type of multiphase flow microscopic imaging measurement system based on particle imaging technology is designed to overcome the problems existing in the prior art. SUMMARY

[0003] To solve the problem that the existing multiphase flow microscopic imaging measurement system cannot obtain clear and continuous particle motion data, affecting the accuracy of measurement, the utility model provides a kind of multiphase flow microscopic imaging measurement system based on particle imaging technology.

[0004] The utility model discloses a kind of multi-phase flow microscopic imaging measurement systems based on particle imaging technology, including multi-phase flow injection system, microchip, waste collection system, optical system, image acquisition system and image processing system, the multi-phase flow injection system, microchip and waste collection system are sequentially connected, the multi-phase flow injection system is used to mix different phase fluid to obtain multi-phase flow, and multi-phase flow is mixed with nano particle and then injected into the microchip, the microchip is used to carry the mixture of multi-phase flow and nano particle, the waste collection system is used to collect waste, the optical system is arranged below the microchip, for irradiating the microchip, the image acquisition system is arranged above the microchip, for collecting the movement trajectory of nano particle in multi-phase flow, the image processing system is connected with the image acquisition system, for identifying nano particle and tracking the movement trajectory of nano particle, obtain the microscopic full-field flow velocity distribution, phase distribution, interface characteristic and transient flow characteristic of multi-phase flow.

[0005] According to some embodiments of the utility model, a kind of multi-phase flow microscopic imaging measurement systems based on particle imaging technology, the multi-phase flow injection system includes first fluid storage tank, second fluid storage tank, fluid injection device, mixing device and nano particle generator, the output of the first fluid storage tank is connected with first pipeline by first branch, the output of the second fluid storage tank is connected with first pipeline by second branch, the output of the fluid injection device is connected with first pipeline by third branch, first pipeline is connected with the input of the microchip by second pipeline, first pipeline is connected with the input of the mixing device by third pipeline, the output of the mixing device is connected with the input of the microchip by fourth pipeline, the output of the nano particle generator is connected with the input of the mixing device by fifth pipeline.

[0006] According to some embodiments of the utility model, a kind of multi-phase flow microscopic imaging measurement systems based on particle imaging technology, first pipeline is connected with the first branch and second branch by three-way connector, first pipeline is connected with second pipeline and third pipeline by three-way connector.

[0007] According to some embodiments of the utility model, a kind of multi-phase flow microscopic imaging measurement systems based on particle imaging technology, valve is equipped on the first branch, valve is equipped on the second branch.

[0008] According to some embodiments of the utility model, a kind of multi-phase flow microscopic imaging measurement systems based on particle imaging technology, first buffer tank is equipped on the second pipeline, valve is equipped between first pipeline and the first buffer tank, valve is equipped between the first buffer tank and the microchip.

[0009] According to some embodiments of the utility model discloses a kind of multi-phase flow microscopic imaging measurement system based on particle imaging technology, second buffer tank is equipped on the third pipeline, valve is equipped between the first pipeline and the second buffer tank, valve is equipped between the second buffer tank and the mixing device.

[0010] According to some embodiments of the utility model discloses a kind of multi-phase flow microscopic imaging measurement system based on particle imaging technology, the microchip includes one of glass chip or polydimethylsiloxane chip.

[0011] According to some embodiments of the utility model discloses a kind of multi-phase flow microscopic imaging measurement system based on particle imaging technology, the optical system includes high-power laser emitter.

[0012] According to some embodiments of the utility model discloses a kind of multi-phase flow microscopic imaging measurement system based on particle imaging technology, the image acquisition system includes high-speed camera.

[0013] According to some embodiments of the utility model discloses a kind of multi-phase flow microscopic imaging measurement system based on particle imaging technology, further include high-temperature high-pressure reaction kettle, the high-temperature high-pressure reaction kettle is used to heat the microchip.

[0014] The utility model discloses a kind of multi-phase flow microscopic imaging measurement system based on particle imaging technology, nanometer or micron grade particle is as tracer particle, through multi-phase flow injection system, nanometer particle and multi-phase flow fluid are introduced into microchip, are illuminated by optical system, under the illumination of strong light source and microchip multi-channel synchronous control, utilize accurate image acquisition system to shoot, obtain high-resolution nanometer particle image, so that these nanometer particles can be clearly presented on image, to provide high-quality basic data for subsequent image processing and motion trajectory analysis, the position change of these nanometer particles in fluid is recorded and handled by image processing system, the utility model combines high-resolution optical imaging, nanometer particle imaging and advanced image processing algorithm, can accurately capture nanometer particle in fluid in the distribution of nanometer structure in multi-phase flow.This system can realize the measurement to microcosmic full-field flow velocity distribution, phase distribution, interface characteristic, transient flow characteristic etc. of multi-phase flow without interfering with fluid.The system is applicable to the accurate measurement and analysis of multi-phase flow in scientific research and industrial application, with the advantages of high precision, high efficiency, the system has extensive application potential in the research and industrial process control of multi-phase flow characteristic, is a promising measurement system, it combines fluid mechanics, optical imaging, image processing and other multidisciplinary technologies, provides an innovative platform for nanometer and microscale observation and analysis of multi-phase flow. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1It is a structure schematic view of a multiphase flow microscopic imaging measurement system based on particle imaging technology.

[0016] In the figure: 1, optical system, 2, microscopic chip, 3, image acquisition system, 4, nano-particle generator, 5, mixing device, 6, fluid injection device, 7, first fluid storage tank, 8, second fluid storage tank, 9, waste collection system, 10, image processing system, 11, first pipeline, 12, second pipeline, 13, third pipeline, 14, fourth pipeline, 15, fifth pipeline, 16, first branch, 17, second branch, 18, third branch, 19, first buffer tank, 20, second buffer tank. DETAILED DESCRIPTION

[0017] The embodiment of the utility model will be described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0018] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model, and the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0019] The multiphase flow microscopic imaging measurement system based on particle imaging technology of the embodiment is as follows, Figure 1As shown, it comprises a multiphase flow injection system, a microchip 2, a waste collection system 9, an optical system 1, an image acquisition system 3 and an image processing system 10. The multiphase flow injection system, the microchip 2 and the waste collection system 9 are connected in sequence. The multiphase flow injection system is used to mix different phase fluids to obtain a multiphase flow, and to inject the mixture of the multiphase flow and nanoparticles into the microchip 2. The multiphase flow injection system can also inject the multiphase flow into the microchip 2. The multiphase flow injection system is the power source for realizing the flow of the multiphase flow in the entire measurement system. The microchip 2 is used to carry the mixture of the multiphase flow and nanoparticles, and is the core area of the multiphase flow experiment. The waste collection system 9 is used to collect waste and ensure the cleanliness of the experimental environment. The optical system 1 is arranged below the microchip 2 and is used to irradiate the microchip 2, so that the position change of the nanoparticles during movement is clearly presented. The image acquisition system 3 is arranged above the microchip 2 and is used to acquire the movement trajectory of the nanoparticles in the multiphase flow. The image processing system 10 is connected with the image acquisition system 3 and is used to identify the nanoparticles and track the movement trajectory of the nanoparticles, so as to obtain the micro full-field flow velocity distribution, phase distribution, interface characteristics and transient flow characteristics of the multiphase flow. Based on the mixing and injection of the nanoparticles and the multiphase flow fluid into the microchip 2, the clear imaging of the nanoparticles is realized by irradiation of the optical system 1. The image acquisition system 3 captures the trajectory of the nanoparticles and transmits it to the image processing system 10. The image processing system 10 records the image sequence, identifies the nanoparticles by using the image processing algorithm, and tracks the position change of the nanoparticles to calculate the velocity and acceleration. The system can analyze the movement of the nanoparticles in high-speed flow in real time, comprehensively measure the nanoparticle distribution, velocity and movement trajectory, and provide high-resolution support for multiphase flow dynamics research.

[0020] It should be noted that, as a preferred embodiment of the present application, the multiphase flow injection system comprises a first fluid storage tank 7, a second fluid storage tank 8, a fluid injection device 6, a mixing device 5 and a nanoparticle generator 4, the output end of the first fluid storage tank 7 is connected to the first pipeline 11 through a first branch 16, the output end of the second fluid storage tank 8 is connected to the first pipeline 11 through a second branch 17, preferably, the first pipeline 11 is connected to the first branch 16 and the second branch 17 through a three-way connector, a valve is arranged on the first branch 16, and a valve is arranged on the second branch 17, so as to realize injection of different fluids by adjusting the opening and closing of the valves, and the valves are one-way valves. The output end of the fluid injection device 6 is connected to the first pipeline 11 through a third branch 18, the first pipeline 11 is connected to the input end of the microchip 2 through a second pipeline 12, preferably, a first buffer tank 19 is arranged on the second pipeline 12, a valve is arranged between the first pipeline 11 and the first buffer tank 19, and a valve is arranged between the first buffer tank 19 and the microchip 2, so as to realize injection of different fluids by adjusting the opening and closing of the valves, and the valves are one-way valves. The first pipeline 11 is connected to the input end of the mixing device 5 through a third pipeline 13, preferably, the first pipeline 11 is connected to the second pipeline 12 and the third pipeline 13 through a three-way connector, a second buffer tank 20 is arranged on the third pipeline 13, a valve is arranged between the first pipeline 11 and the second buffer tank 20, and a valve is arranged between the second buffer tank 20 and the mixing device 5, so as to realize injection of different fluids by adjusting the opening and closing of the valves, and the valves are one-way valves. The output end of the mixing device 5 is connected to the input end of the microchip 2 through a fourth pipeline 14, and the output end of the nanoparticle generator 4 is connected to the input end of the mixing device 5 through a fifth pipeline 15.

[0021] It should be noted that, as a preferred embodiment of the present application, the microchip 2 comprises one of a glass chip or a polydimethylsiloxane chip, in addition, the material of the microchip 2 can also be silicon, polymer or other transparent materials, the material of the microchip 2 needs to be a material with high transparency and low light scattering characteristics, so as to ensure that light can pass through the microchip 2 without interference for imaging, the transparent flow channel structure of the microchip 2 controls the flow of fluid in the micro space of the microchip 2 to generate a specific flow pattern, such as laminar flow, turbulent flow, etc., so as to observe the motion state of the nanoparticles under different flow conditions. The size of the nanoparticles is less than 10 nm, which ensures that the multiphase flow fluid will not be affected and can flow in the flow channel of the microchip 2 without blocking.

[0022] It should be noted that, as a preferred embodiment of the present embodiment, the optical system 1 comprises a high-power laser emitter, which emits laser light that can irradiate the mixed area in the microchip 2. The wavelength, power and incident angle of the laser light can be adjusted according to the fluid properties and the size of the nanoparticles under study to enhance the clarity of the particles in the image. During laser irradiation, scattering and reflection control should also be considered to avoid affecting the image quality. The optical system 1 can improve the visibility of the nanoparticles and ensure that the motion of the nanoparticles is clearly visible in the image, facilitating the capture by the image acquisition system 3. The optical system 1 can also be other strong light source emitters.

[0023] It should be noted that, as a preferred embodiment of the present embodiment, the image acquisition system 3 comprises a high-speed camera, which can record the motion trajectory of the nanoparticles in multiphase flow by high-speed imaging and by shooting the mixed area of the fluid and the nanoparticles in the microchip 2, providing a data basis for subsequent image processing. The image processing system 10 uses edge detection and threshold segmentation algorithm to identify the particle contour, and calculates the motion trajectory of the particle through the position change rate.

[0024] It should be noted that, as a preferred embodiment of the present embodiment, it also comprises a high-temperature and high-pressure reactor, which is used to heat the microchip 2. The high-temperature and high-pressure reactor can realize imaging measurement under high-temperature and high-pressure environment. The specific operation mode is to clamp the microchip 2 into the high-temperature and high-pressure reactor, pass pressurized gas into the high-temperature and high-pressure reactor, and use the heating belt function of the high-temperature and high-pressure reactor to heat and pressurize the microchip 2 to the required pressure and temperature, so as to realize micro-imaging measurement under high-temperature and high-pressure environment. A synchronous control module can also be provided, which is connected with the optical system 1 and the image acquisition system 3 through a flip-flop, and is used for accurately controlling the imaging time point. The system adopts modular design, and the components can be flexibly combined and detached to adapt to different types of multiphase flow experimental requirements.

[0025] The specific experimental steps of the multiphase flow micro-imaging measurement system based on particle imaging technology include the following steps:

[0026] S1. Assemble the test system;

[0027] S2. System leak detection;

[0028] S3. Inject the mixed multiphase flow containing reflective nanoparticles or fluorescent nanoparticles into the microchip 2;

[0029] S4. The optical system 1 illuminates the microchip 2, and the image acquisition system 3 captures the mixing area of the nanoparticles and the multiphase flow fluid, capturing the dynamic changes of the nanoparticles. The frame rate and exposure time of the optical system 1 can be adjusted according to the flow rate of the fluid and the movement speed of the nanoparticles to ensure that the fine motion trajectory of the nanoparticles can be captured. Through high-speed imaging, the optical system 1 can record the instantaneous position and motion state of the nanoparticles in the fluid on a microscale, thereby generating a complete image sequence;

[0030] S5. Image processing and analysis, time series analysis, which can be combined with machine learning or deep learning techniques, can infer the flow characteristics and distribution rules of the fluid in the microchip according to the distribution and migration of the particles. After the image sequence is collected, the image processing system 10 processes and analyzes the data through image processing software. The image processing software uses image processing algorithms to identify the outline and position of each nanoparticle and extracts the motion trajectory of the nanoparticle during the multiphase flow process. Subsequently, through data analysis of the trajectory, the dynamic parameters of the nanoparticles can be obtained, thereby generating a two-dimensional motion model of the nanoparticles in the multiphase flow.

[0031] In addition, before each experiment, the measurement system needs to be calibrated, including adjustment of the optical path, adjustment of the focal length of the optical system 1, and control of the microchannel flow rate in the microchip 2 to ensure that each parameter is in the best state. Through an automatic or semi-automatic control system, the light source, optical system 1, and multiphase flow fluid injection rate can be accurately adjusted to achieve the best imaging effect.

[0032] The measurement system of the present embodiment can be used to study the dynamic behavior of multiphase flow during oil well production, to study the flow in particle reactors and mixers, to study the flow and distribution of particles in sewage during water pollution treatment, to analyze the motion of cells or microparticles in microfluidic devices, to analyze the motion state of particles during spraying and deposition to improve coating quality and uniformity, to study combustion and particle emission processes in rocket and turbine engines, to study the motion and distribution of droplets in air, and to improve spraying effect and irrigation efficiency, etc.

[0033] The measurement system of the embodiment can solve the problems of insufficient space-time resolution, particle interference, insufficient data extraction, and measurement probe interference in traditional microscopic particle imaging in nanometer and micrometer scales. The embodiment provides an innovative technology related to fluid mechanics and particle dynamics, and the main goal is to obtain and analyze the particle motion characteristics in multiphase flow in real time to infer the micro-imaging measurement system of the characteristics of multiphase fluid phase distribution and interface characteristics. In the multiphase flow system based on the microchip, the nanoparticles are mixed with the multiphase flow fluid and injected into the microchip to form a multiphase flow field in a controlled environment. A laser or other high-intensity light source is used to irradiate the mixed area of the fluid and the nanoparticles to enhance the visibility of the nanoparticles during the flow process, so that the nanoparticles show clear position and contour on the flow path. In order to record the motion trajectory of the particles in real time, a high-speed camera is provided to continuously shoot the mixed area at a high frame rate, and the generated image sequence records the motion behavior of each nanoparticle in the multiphase flow in detail. With the help of image processing algorithms, such as edge detection and threshold segmentation, the particles in each frame of image are identified and segmented, and the accurate position of the particles is extracted. Subsequently, particle tracking algorithms such as cross-correlation algorithm or particle image velocimetry algorithm are used to track the position change of the particles in the time sequence, and the dynamic motion trajectory of the particles is reconstructed. Based on the space-time change of the position of the particles in the image sequence, the instantaneous velocity and acceleration of the particles can be further calculated. Through statistical analysis, the velocity distribution, acceleration distribution and overall motion trajectory of the nanoparticles in the flow field and other multiphase flow characteristic parameters can be obtained. In addition, the uniformity of the distribution of the nanoparticles in the microchip, the stability of the flow pattern and the relative motion between the nanoparticles can be evaluated by using the embodiment, thereby providing comprehensive data support for the nanoparticle dynamics. This multiphase flow analysis technology based on image processing and dynamic tracking provides an efficient and accurate means for the behavior research of nanoparticles in complex fluids, and helps to deeply understand the micro-movement mechanism and flow characteristics of nanoparticles.

[0034] Embodiments of the present application are given by way of example and illustration only, and are not intended to limit the present application to the forms disclosed. Many modifications and variations of the described embodiments are possible in light of the above teachings. The embodiments were chosen and described in order to best illustrate the principles of the present application and its practical application and to thereby enable one of ordinary skill in the art to best utilize the present application in various embodiments and with various modifications being suited to the particular use contemplated.

Claims

1. A multiphase flow micro- imaging measurement system based on particle imaging technology, characterized in that, The system comprises a multiphase flow injection system, a microchip (2), a waste collection system (9), an optical system (1), an image acquisition system (3) and an image processing system (10), the multiphase flow injection system, the microchip (2) and the waste collection system (9) are sequentially connected, the multiphase flow injection system is used for mixing different phase fluids to obtain a multiphase flow, and the multiphase flow is mixed with nanoparticles and then injected into the microchip (2), the microchip (2) is used for carrying the mixture of the multiphase flow and the nanoparticles, the waste collection system (9) is used for collecting waste, the optical system (1) is arranged below the microchip (2) and is used for irradiating the microchip (2), the image acquisition system (3) is arranged above the microchip (2) and is used for acquiring the motion trajectory of the nanoparticles in the multiphase flow, and the image processing system (10) is connected with the image acquisition system (3) and is used for identifying the nanoparticles and tracking the motion trajectory of the nanoparticles to obtain the microcosmic full-field flow velocity distribution, phase distribution, interface characteristics and transient flow characteristics of the multiphase flow.

2. The multiphase flow microscopic imaging measurement system based on particle imaging technology according to claim 1, wherein, The multiphase flow injection system comprises a first fluid storage tank (7), a second fluid storage tank (8), a fluid injection device (6), a mixing device (5) and a nanoparticle generator (4), the output end of the first fluid storage tank (7) is connected with a first pipeline (11) through a first branch (16), the output end of the second fluid storage tank (8) is connected with the first pipeline (11) through a second branch (17), the output end of the fluid injection device (6) is connected with the first pipeline (11) through a third branch (18), the first pipeline (11) is connected with the input end of the microchip (2) through a second pipeline (12), the first pipeline (11) is connected with the input end of the mixing device (5) through a third pipeline (13), the output end of the mixing device (5) is connected with the input end of the microchip (2) through a fourth pipeline (14), and the output end of the nanoparticle generator (4) is connected with the input end of the mixing device (5) through a fifth pipeline (15).

3. The multiphase flow microscopic imaging measurement system based on particle imaging technology according to claim 2, wherein, The first pipeline (11) is connected with the first branch (16) and the second branch (17) through a three-way connector, and the first pipeline (11) is connected with the second pipeline (12) and the third pipeline (13) through a three-way connector.

4. The multiphase flow microscopic imaging measurement system based on particle imaging technology of claim 2, wherein, Valves are arranged on the first branch (16) and the second branch (17).

5. The multiphase flow microscopic imaging measurement system based on particle imaging technology of claim 2, wherein, A first buffer tank (19) is arranged on the second pipeline (12), valves are arranged between the first pipeline (11) and the first buffer tank (19) and between the first buffer tank (19) and the microchip (2).

6. The multiphase flow microscopic imaging measurement system based on particle imaging technology of claim 2, wherein, A second buffer tank (20) is arranged on the third pipeline (13), valves are arranged between the first pipeline (11) and the second buffer tank (20) and between the second buffer tank (20) and the mixing device (5).

7. The multi-phase flow microscopic imaging measurement system based on particle imaging technology according to claim 1, wherein, The microchip (2) comprises one of a glass chip and a polydimethylsiloxane chip.

8. The multiphase flow microscopic imaging measurement system based on particle imaging technology of claim 1, wherein, The optical system (1) comprises a high-power laser emitter.

9. The multi-phase flow microscopic imaging measurement system based on particle imaging technology according to claim 1, wherein, The image acquisition system (3) comprises a high-speed camera.

10. The multiphase flow microscopic imaging measurement system based on particle imaging technology of claim 1, wherein, A high-temperature and high-pressure reaction kettle is further included, and the high-temperature and high-pressure reaction kettle is used for heating the micro chip (2).

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