Vacuum cooling method and system based on phase difference double helix and dynamic cooperative control

Abstract

The invention discloses a vacuum cooling method based on phase difference double helix and dynamic cooperative control, which comprises the following steps: fluid is placed in a rotationally symmetrical vacuum roller, and the inner wall of the roller is provided with a double helix structure with a specific phase difference; keeping the pressure in the vacuum cavity lower than the saturated vapor pressure of the fluid at the current temperature; the roller is driven to rotate to generate a combined flow field of axial migration and radial shearing; collecting global temperature data through temperature measurement sensors fixed on a plurality of non-parallel mounting rods of an end cover; querying a preset temperature-viscosity mapping table according to the temperature data, and determining a critical transition point of the fluid rheological behavior; when the temperature reaches the critical point, dynamically adjusting the rotating speed of the roller to an optimization interval; meanwhile, the actual shear rate of the flow field is dynamically calculated and maintained to be not lower than a critical value based on real-time rheological characteristics. The invention further discloses a vacuum cooling system corresponding to the vacuum cooling method. The problems of splashing and non-uniform temperature in the vacuum cooling process of the high-viscosity fluid are effectively solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fluid vacuum cooling, and particularly relates to a vacuum cooling method and system based on phase difference double helix and dynamic cooperative control. BACKGROUND

[0002] The vacuum cooling technology places the cooled material in a vacuum cavity, reduces the pressure in the vacuum cavity, lowers the boiling point of water vapor, absorbs a large amount of evaporation heat from the material through a small amount of water vapor evaporation in the material, and thus realizes rapid cooling of the material. The vacuum cooling technology has the advantages of rapid cooling, uniform cooling of the inside and outside of the material, controllable temperature, etc.

[0003] However, the traditional vacuum cooling technology has a serious flashing and splashing when cooling the fluid, not only a large amount of the cooled material is lost, but also the vacuum cavity and the vacuum system are often seriously polluted, and the cooling uniformity is poor. The traditional method for suppressing splashing usually covers the material container to prevent splashing from escaping, or controls the pressure drop to slow down the evaporation speed to reduce splashing. However, these methods cannot solve the problem from the essence of splashing, and thus the effect is very poor. Fluid vacuum cooling has become a forbidden area of traditional vacuum cooling. In fact, fluid vacuum cooling is very different from general solid vacuum cooling. In the cooking process, general solid food forms a steam escape channel from the inside to the outside, so that the steam can quickly escape from the inside to the outside in the vacuum cooling process, and a large amount of evaporation heat is taken away to realize rapid cooling of the material. However, in the fluid vacuum cooling process, the fluid surface can realize rapid evaporation to rapidly reduce the temperature, and the steam in the deep part of the fluid has no escape channel and can only escape through the surface by breaking through the surface in the form of flashing and splashing.

[0004] For fluid with low viscosity, stirring can better solve the splashing problem and speed up the cooling speed, but for high-viscosity fluid, the shear force distribution is uneven due to high shear at the end of the paddle and low shear at the center of the paddle, and the high-viscosity fluid is easy to form a dead zone with a large temperature difference between the inside and the outside. Moreover, the high-viscosity fluid has a large resistance to stirring, and the dramatic increase in resistance will cause a sharp drop in operating efficiency or even failure.

[0005] Therefore, for the vacuum cooling of fluid, especially the vacuum cooling of high-viscosity fluid, the traditional method cannot solve the problem of flashing kinetics control and structural design defects, and a new idea is needed to solve the problem of splashing in fluid vacuum cooling, especially the vacuum cooling of high-viscosity fluid. SUMMARY

[0006] To solve the above problems in the prior art, the application provides a vacuum cooling method and system based on phase difference double helix and dynamic cooperative control, which solves a series of problems that a traditional fluid vacuum cooling splash, stirring equipment is difficult to handle high viscosity fluid, and a single helix structure only realizes axial migration and insufficient radial mixing, resulting in excessive temperature difference between the inside and outside.

[0007] The technical solution for achieving the above object is: The vacuum cooling method based on phase difference double helix and dynamic cooperative control according to one of the application comprises the following steps: Step S1, placing a fluid in a rotationally symmetrical vacuum drum, and fixing a double helix structure capable of generating a composite flow field of axial migration and radial shear on the inner wall of the drum; Step S2, establishing and maintaining a vacuum environment, so that the pressure in the vacuum cavity is lower than the saturation vapor pressure of the fluid at the current temperature; Step S3, driving the drum to rotate to make the double helix structure in the drum generate a composite flow field of axial migration and radial shear to the fluid; Step S4, collecting global temperature data through temperature measuring sensors installed on a plurality of non-parallel mounting rods fixed to the end cover and processing the temperature data; Step S5, querying a preset temperature-viscosity mapping table according to the temperature data to determine a critical transition point of the fluid rheological behavior; Step S6, when the temperature reaches the critical transition point, adjusting the drum speed to a preset optimal speed interval; Step S7, based on the real-time state parameters of the fluid, calculating and updating the critical shear rate required to suppress flashing, and adjusting the drum speed to make the actual shear rate of the flow field not lower than the critical value.

[0008] Preferably, in step S5, the preset temperature-viscosity mapping relationship is determined by pre-experiment.

[0009] Preferably, in step S7, the actual shear rate is obtained by at least one of calculation based on equipment operating parameters, torque back calculation or direct measurement.

[0010] Preferably, in step S7, the real-time state parameters of the fluid are obtained by at least one of back calculation based on equipment operating parameters, temperature-viscosity relationship query or online measurement.

[0011] The vacuum cooling system based on phase difference double helix and dynamic cooperative control according to the second aspect of the application comprises: The rotationally symmetrical vacuum drum is sealed, and the inner wall of the drum is provided with the double helix structure; A vacuum generating device is used to establish and maintain the vacuum environment in the drum; a control module for receiving system sensor data and executing control logic of the vacuum cooling method; a vapor removal unit for condensing and removing vapor generated by evaporation; a vacuum pressure sensor for monitoring vacuum pressure within the drum; a temperature monitoring unit comprising the temperature sensors mounted on a plurality of non-parallel mounting rods fixed to the end cap; a drum driving device for driving the drum to rotate and receiving speed command from the control module.

[0012] Preferably, the drum is designed with rotational symmetry, and the drum serves as both a vacuum chamber and a material container, with the inner wall designed as an interface suitable for the backflow of splashing materials.

[0013] Preferably, the double helix structure comprises an outer helix and an inner helix arranged coaxially, and the outer helix and the inner helix are fixed to the inner wall of the drum, and the initial phase difference of the outer helix and the inner helix is set to optimize the range of the composite flow field effect as the drum rotates coaxially.

[0014] Preferably, the outer helix and the inner helix are provided with a functional coating on the surface for reducing material adhesion.

[0015] Preferably, the temperature sensors are mounted on a plurality of non-parallel mounting rods fixed to the end cap, and are ensured to be continuously immersed in the fluid during the operation of the drum.

[0016] Preferably, the control module is configured to perform fusion processing on the data of a plurality of temperature sensors to obtain a representative temperature value for control decision, and the data fusion processing includes but is not limited to arithmetic mean or weighted mean algorithm.

[0017] Preferably, the control module pre-stores temperature-viscosity mapping data of one or more fluids.

[0018] Preferably, the control module dynamically calculates the critical shear rate based on the real-time acquired fluid state parameters according to the pre-set fluid dynamics model.

[0019] Compared with the prior art, the beneficial effects of the present application are: the present application has an optimized structure design of inner and outer double helical blades fixed on the inner wall of the rotationally symmetrical vacuum drum, the rotation of the vacuum drum causes the axial migration and radial shear of the high-viscosity fluid in the drum, which makes the internal steam of the high-viscosity fluid migrate to the surface efficiently, changes the original evaporation in the deep material into surface evaporation, changes the uncontrollable phase change area into stable surface evaporation, and converts the internal evaporation pressure energy into surface evaporation kinetic energy; at the same time, the present application creatively collects global temperature data through a plurality of non-parallel mounting rods fixed on the end cover and processes the temperature data to obtain more accurate guiding temperature, which solves the problem of temperature measurement during the dynamic rotation of the drum; according to the viscosity change of the material fluid, the double-layer control is used to adjust the drum speed in time, which fully suppresses the risk of flashing during the viscosity mutation period and ensures that the system can maintain high performance under both transient and steady state conditions. The present application fundamentally solves the causes of flashing and splashing, makes the internal and external temperatures of the fluid more uniform, and greatly shortens the cooling time; in addition, the present application designs the vacuum cavity as a rotationally symmetrical structure and uses the vacuum cavity as a material container, that is, the vacuum cavity and the material container are combined into one, so that even if there is a small amount of splashing during the cooling process, the splashing material can still be centrifugally recovered through the backflow on the inner surface of the cavity. This structure design also completely solves the problems of splashing escape loss and pollution caused by the separation of the vacuum cavity and the material container in traditional vacuum cooling. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, but do not constitute a limitation of the present application. In the drawings: Fig. 1 is a flowchart of the vacuum cooling method based on the phase difference double helix and dynamic cooperative control of the present application; Fig. 2 is another flowchart of the vacuum cooling method based on the phase difference double helix and dynamic cooperative control in the present application; Fig. 3 is a structural diagram of the vacuum cooling system based on the phase difference double helix and dynamic cooperative control in the present application. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] As shown in Figs. 1-3 , the vacuum cooling method based on the phase difference double helix and dynamic cooperative control comprises: Step S1, place the fluid in a rotationally symmetric vacuum drum 1, the inner wall of the drum 1 is fixed with a double helix structure 2 capable of generating a composite flow field of axial migration and radial shear.

[0023] Step S2, establish and maintain a vacuum environment, so that the pressure in the vacuum cavity is lower than the saturation vapor pressure of the fluid at the current temperature.

[0024] In the embodiment, the establishment and maintenance of the vacuum environment is achieved by extracting the gas in the vacuum cavity through the vacuum generating device 3 (such as a vacuum pump set), and monitoring the pressure in the cavity in real time through the pressure sensor 6. The control module 4 dynamically controls the start and stop of the vacuum generating device 3 according to the preset cooling curve or target temperature, so that the pressure in the cavity is always maintained below the saturation vapor pressure corresponding to the current temperature of the fluid, so as to ensure that the moisture in the fluid can continue to boil and evaporate, taking away the heat. The evaporated steam is mostly removed by condensation in the steam removal unit 5 (such as a condenser), and the remaining non-condensable gas is removed by the vacuum generating device 3, thereby maintaining a stable vacuum environment.

[0025] Step S3, drive the drum 1 to rotate to make the double helix structure 2 in it generate a composite flow field of axial migration and radial shear to the fluid.

[0026] Step S4, collect global temperature data through the temperature measuring sensor 7 installed on the multiple non-parallel mounting rods fixed on the end cover and process the temperature data.

[0027] Step S5, according to the temperature data, query the preset temperature-viscosity mapping table to determine the critical transition point of the fluid rheological behavior.

[0028] In the embodiment, the preset temperature-viscosity mapping relationship is determined by pre-experiment; as the temperature of the fluid decreases, the viscosity of the fluid increases nonlinearly, and at a certain temperature point, the viscosity of the fluid will jump by orders of magnitude near the mutation point, resulting in a qualitative change in the rheological behavior of the fluid, which is significantly manifested as the appearance or sharp increase of the yield stress. Therefore, the critical transition point of the fluid rheological behavior needs to be closely monitored, and the mapping relationship between the temperature and the critical transition point of the rheological behavior is determined by pre-experiment.

[0029] Step S6, when the temperature reaches the critical transition point, adjust the speed of the drum 1 to a preset optimal speed interval; the reason is that if the original high speed of the drum 1 is maintained, excessive turbulence will be generated, which will destroy the ordered flow field of the steam directional migration, and will instead aggravate the risk of flashing; therefore, the present application dynamically adjusts the speed to a significantly lower optimal interval when the viscosity mutation is detected, aiming to achieve the following objectives: the shear stress (τ) provided is still much larger than the new yield stress (τ y), which is enough to destroy its internal network structure to form a migration channel for plastic extrusion of steam; at the same time, it avoids energy waste and flow field instability caused by too high rotating speed, and maintains a laminar flow field that can efficiently guide steam to orderly escape from the surface; the optimized rotating speed range is a key process parameter to achieve the above-mentioned 'efficient plastic perforation' rather than 'inefficient turbulent tearing', and its necessity is derived from the qualitative change of fluid rheological behavior at the viscosity mutation point.

[0030] Step S7, based on the real-time state parameters of the fluid, the critical shear rate required to suppress flash is calculated and updated, and the actual shear rate of the flow field is not less than the critical value by adjusting the rotating speed of the drum 1, to ensure efficient suppression of flash and promote steam escape.

[0031] In the embodiment, the physical nature of the critical shear rate is that for Newtonian fluid, the critical shear rate is the minimum shear rate at which the surface steam film breaks (when the shear force > steam film surface tension, the bubble is torn and broken); for non-Newtonian fluid, the critical shear rate is the critical shear rate at which the apparent viscosity changes, and for the viscosity mutation zone (such as the yield stress point of shear thinning fluid), the cohesive structure of the fluid is destroyed at this time, and the steam migration resistance drops sharply; maintaining the actual shear rate ≥ the critical shear rate can effectively break the pressure shell layer and effectively reduce energy consumption.

[0032] In the embodiment, the actual shear rate is obtained by at least one of calculation based on device operating parameters, torque back calculation or direct measurement.

[0033] In the embodiment, the real-time state parameters of the fluid are obtained by at least one of back calculation based on device operating parameters, temperature-viscosity relationship query or online measurement.

[0034] In the embodiment, step S6 is based on event-triggered rule control. When the temperature monitoring system detects that the material temperature reaches the preset viscosity mutation point, the rotating speed of the drum 1 is immediately adjusted to the pre-set safe range, realizing fast response and safety bottom line. The viscosity mutation is a major working condition change point, and the flash risk increases sharply; this layer of control, as a'safety switch', can quickly pull the system from a possibly unstable state (high rotating speed, high shear) into a known, safe operating window, effectively preventing flash during the control algorithm calculation gap. The range is a proven safe range, ensuring the immediacy and reliability of the control.

[0035] In the embodiment, step S7 is based on model adaptive control (actual shear rate ≥ critical shear rate control), which runs continuously throughout the cooling process. The core purpose is to achieve precise and optimal control. This layer of control is a fine "throttle" that ensures the system is always running in the most economical and gentle conditions that can suppress flashing within the safety window provided by the first layer of control, avoiding energy waste and excessive shear, achieving optimal energy efficiency and product quality. Rule-based control responds quickly, but is relatively rough; model control is accurate, but calculation and execution takes time. The combination of the two ensures that the system maintains high performance in both transient and steady-state conditions.

[0036] The above dynamic control process continues until the fluid material reaches the preset target cooling temperature. The target cooling temperature is pre-set by the process requirements and is confirmed by the temperature monitoring system. Alternatively, the control process can also be terminated according to the preset cooling time or the achievement of a specific vacuum pressure value. When the termination condition is reached, the control module 4 successively closes the drum driving device 8, the vacuum generating device 3 and the steam removal unit 5, completing the entire cooling process.

[0037] As shown in Fig. 3 the vacuum cooling system based on phase difference double helix and dynamic cooperative control includes: a rotationally symmetric vacuum sealed drum 1 with a double helix structure 2 on its inner wall; a vacuum generating device 3 for establishing and maintaining a vacuum environment in the drum 1; a control module 4 for receiving system sensor data and executing the control logic of the vacuum cooling method; a steam removal unit 5 for condensing and removing the steam generated by evaporation; a vacuum pressure sensor 6 for monitoring the vacuum pressure in the drum; a temperature monitoring unit including temperature measuring sensors 7 mounted on multiple non-parallel mounting rods fixed to the end cap; a drum driving device 8 for driving the drum 1 to rotate and receiving speed adjustment instructions from the control module 4.

[0038] In the embodiment, the drum 1 is rotationally symmetric, and the drum 1 serves as both a vacuum cavity and a material container, with its inner wall designed to accommodate the backflow of splashed material. In traditional vacuum cooling, the vacuum cavity and the material container are separate, so that during the cooling process, the material splashes from the container into the vacuum cavity, not only wasting material but also contaminating the vacuum cavity. The combination of the vacuum cavity and the material container completely solves the contamination of the vacuum cavity by splashing material, and the vacuum cavity has a rotationally symmetric structure, with its inner wall specially treated. Even if a small amount of material splashes onto the wall, it can still be recycled through backflow.

[0039] In the embodiment, the double helix structure 2 comprises an outer helix 21 and an inner helix 22 coaxially arranged, the outer helix 21 and the inner helix 22 are fixed on the inner wall of the roller barrel 1, and rotate coaxially with the roller barrel 1, and the initial phase difference of the outer helix 21 and the inner helix 22 is set to a range capable of optimizing the composite flow field effect, so as to ensure that the rotation of the roller barrel generates a composite flow field of axial migration and radial shear.

[0040] In the embodiment, the surfaces of the outer helix 21 and the inner helix 22 are provided with a functional coating for reducing material adhesion.

[0041] In the embodiment, the temperature measuring sensor 7 is installed on a plurality of non-parallel installation rods fixed on the end cover, and is ensured to be continuously immersed in the fluid during the operation of the roller barrel 1; since there is a temperature gradient in the fluid in the roller barrel 1, the data of a single probe cannot reliably represent the overall state, so it is necessary to collect temperature data at multiple points, the fluid in the roller barrel 1 is not 100% full, and the cavity part also changes with the rotation of the roller barrel 1, so it is necessary to fix a plurality of temperature probe installation rods, i.e., the temperature measuring sensor 7, on the fixed central end cover, so that the temperature probe does not rotate with the roller barrel 1; and the installation rods are at an angle and are always immersed in the fluid, so as to ensure that stable temperature data in the whole domain are obtained.

[0042] In the embodiment, the control module 4 is configured to perform fusion processing on the data of the plurality of temperature measuring sensors 7 to obtain a representative temperature value for control decision-making, and the data fusion processing includes but is not limited to an arithmetic mean or a weighted mean algorithm.

[0043] In the embodiment, the control module 4 pre-stores temperature-viscosity mapping relationship data of one or more fluids.

[0044] In the embodiment, the control module 4 dynamically calculates the critical shear rate based on the real-time acquired fluid state parameters according to a preset fluid dynamics model.

[0045] In order to verify the effect of the present application, the following embodiment selects a high-viscosity non-Newtonian fluid as the test object. It shows strong rheological property change during the whole cooling process, which is an ideal model for verifying the control strategy of the present application.

[0046] Embodiment 1: Complete scheme effect embodiment Objective: To show the comprehensive effect achieved by adopting all the technical features claimed in the present application.

[0047] Step S1, placing the fluid in a rotationally symmetrical vacuum roller barrel 1, and fixing a double helix structure 2 capable of generating a composite flow field of axial migration and radial shear on the inner wall of the roller barrel 1; Step S2, establishing and maintaining a vacuum environment, so that the pressure in the vacuum cavity is lower than the saturation vapor pressure of the fluid at the current temperature Step S3, drive the rotation of the roller 1 to make the double helix structure 2 inside it produce a composite flow field of axial migration and radial shear on the fluid; Step S4, collect global temperature data through a plurality of non-parallel temperature measurement sensors 7 fixed on the end cover and process the temperature data; Step S5, according to the temperature data, query the preset temperature-viscosity mapping table to determine the critical transition point of the fluid rheological behavior; Step S6, when the temperature reaches the critical transition point, adjust the roller 1 speed to a preset optimal speed interval; Step S7, based on the real-time state parameters of the fluid, calculate and update the critical shear rate required to suppress flashing, and adjust the roller 1 speed to make the actual shear rate of the flow field not lower than the critical value.

[0048] Results: The flashing occurrence rate is significantly reduced to a very low level; the average cooling time is greatly shortened; the uniformity of the internal and external temperatures of the material is significantly improved.

[0049] Example 2: Key feature necessity verification example In order to verify the synergistic contribution of each technical feature of the present application, three groups of comparative experiments are set up, as shown in Table 1: Table 1 ; The experimental results are shown in Table 2: Table 2

[0050] Finally, it should be pointed out that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A vacuum cooling method based on phase difference double helix and dynamic synergistic control, characterized in that, include: Step S1: The fluid is placed in a rotationally symmetric vacuum drum (1), and the inner wall of the drum (1) is fixed with a double helix structure (2) that can generate a composite flow field of axial migration and radial shear. Step S2: Establish and maintain a vacuum environment so that the pressure inside the vacuum chamber is lower than the saturated vapor pressure of the fluid at the current temperature. Step S3, drive the roller (1) to rotate so that the double helix structure (2) inside it generates a composite flow field of axial migration and radial shearing on the fluid; Step S4: Collect global temperature data and process the temperature data by using temperature sensors (7) installed on multiple non-parallel mounting rods fixed to the end cap; Step S5: Based on the temperature data, query the preset temperature-viscosity mapping table to determine the critical transition point of the fluid rheological behavior; Step S6: When the temperature reaches the critical transition point, the rotation speed of the drum (1) is adjusted to a preset optimized rotation speed range; Step S7: Based on the real-time state parameters of the fluid, calculate and update the critical shear rate required to suppress flashover, and adjust the rotational speed of the drum (1) so that the actual shear rate of the flow field is not lower than the critical value.

2. The method according to claim 1, characterized in that, In step S5, the preset temperature-viscosity mapping relationship is determined through preliminary experiments.

3. The method according to claim 1, characterized in that, In step S7, the actual shear rate is obtained by at least one of the following methods: calculation based on equipment operating parameters, torque back-calculation, or direct measurement.

4. The method according to claim 1, characterized in that, In step S7, the real-time state parameters of the fluid are obtained through at least one of the following methods: back-calculation based on equipment operating parameters, temperature-viscosity relationship query, or online measurement.

5. A vacuum cooling system based on the vacuum cooling method of phase difference double helix and dynamic coordinated control as described in claim 1, characterized in that, include: The roller (1) is rotate-symmetrically vacuum-sealed, and its inner wall is provided with the double helix structure (2). A vacuum generating device (3) is used to establish and maintain a vacuum environment inside the drum (1); The control module (4) is used to receive system sensor data and execute the control logic of the vacuum cooling method; A steam removal unit (5) is used to condense and remove steam generated during evaporation; Vacuum pressure sensor (6) is used to monitor the vacuum pressure inside the drum; Temperature monitoring unit, including the temperature sensor (7) mounted on a plurality of non-parallel mounting rods fixed to the end cap; The roller drive device (8) is used to drive the roller (1) to rotate and to receive speed adjustment commands from the control module (4).

6. The system according to claim 5, characterized in that, The roller (1) is a rotationally symmetrical design. The roller (1) serves as both a vacuum chamber and a material container. Its inner wall is designed to facilitate the backflow of splashed materials.

7. The system according to claim 5, characterized in that, The double helix structure (2) includes an outer helix (21) and an inner helix (22) arranged coaxially. The outer helix (21) and the inner helix (22) are fixed on the inner wall of the drum (1). As the drum (1) rotates coaxially, the initial phase difference between the outer helix (21) and the inner helix (22) is set to a range that can optimize the combined flow field effect.

8. The system according to claim 5, characterized in that, The outer spiral blade (21) and the inner spiral blade (22) are provided with functional coatings to reduce material adhesion.

9. The system according to claim 5, characterized in that, The temperature sensor (7) is mounted on multiple non-parallel mounting rods fixed to the end cap and ensures that it is continuously immersed in the fluid during the operation of the roller (1).

10. The system according to claim 5, characterized in that, The control module (4) is configured to perform data fusion processing on the data from multiple temperature sensors (7) to obtain a representative temperature value for control decision. The data fusion processing includes, but is not limited to, arithmetic average or weighted average algorithms.

11. The system according to claim 5, characterized in that, The control module (4) contains pre-stored temperature-viscosity mapping data for one or more fluids.

12. The system according to claim 5, characterized in that, The control module (4) dynamically calculates the critical shear rate based on the real-time acquired fluid state parameters and a preset fluid dynamics model.

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