Device and method for simulating mass transfer of bubbles in fluid based on micro-fluidic chip

Abstract

The invention discloses an in-fluid bubble mass transfer simulation device and method based on a micro-fluidic chip. The micro-fluidic chip is installed on the micro-fluidic chip fixing module, an inlet and an outlet of the micro-fluidic chip are communicated with the gas-liquid mixed injection module and the waste liquid collecting tank respectively, the microscope is used for observing the bubble preparation process in fluid in the micro-fluidic chip, and the bubble mass transfer experiment process is subjected to real-time imaging observation by adopting the industrial camera; the method comprises the following steps: processing the micro-fluidic chip; injecting gas and liquid into the micro-fluidic chip by using a gas-liquid mixed injection module; fixing the micro-fluidic chip carrying the bubbles on a micro-fluidic chip fixing module; and observing the redistribution evolution process of the bubbles in the micro-fluidic chip influenced by the unstable gravity to obtain the curing mass transfer rule of the bubbles under the microgravity or supergravity condition. The method can reduce the residual capture state of carbon dioxide bubbles in rock pores, and has important significance for evaluating long-term safety and stability of a carbon dioxide geological sequestration project.

Description

Technical Field

[0001] The present invention belongs to the field of experimental research on fluid mass transfer models in porous media, and particularly relates to a device and method for simulating bubble mass transfer in fluids based on a microfluidic chip. Background Art

[0002] In recent years, with the commencement of major projects such as underground carbon dioxide geological storage, underground oil and gas exploitation, underground hydrogen storage, and seabed gas hydrate exploitation, the long-term redistribution process of bubbles in pores under the influence of gravity has received extensive attention. Taking carbon dioxide geological storage as an example, carbon dioxide bubbles stored in the pore structure of the reservoir in a residual capture state will undergo mass transfer upward in the form of thermal diffusion under the influence of gravity, which poses a threat to the long-term safety and stability of carbon dioxide geological storage projects. Therefore, it is of great significance to evaluate the long-term evolution process of bubbles in a porous medium system.

[0003] However, in simulation experiments, it is difficult to study this process using rock samples because it is impossible to directly observe the migration process of bubbles in pores. In addition, the preparation of the model at the initial stage of the experiment and the sealing during the experiment are also important problems. Therefore, how to simply and conveniently prepare a model for the experiment on the redistribution and evolution of bubbles in the pore structure has become a technical problem. At present, the research and analysis of this process at home and abroad are mostly limited to the theoretical level, and a set of experimental devices and methods are urgently needed for verification. Summary of the Invention

[0004] In order to solve the problems existing in the background art, the purpose of the present invention is to provide a device and method for simulating bubble mass transfer in fluids based on a microfluidic chip. The present invention prepares a model under a microscope, seals bubbles in a microfluidic chip with double-depth pores through a gas-liquid co-injection method, fixes the bubbles in the pore structure using a microfluidic chip fixing module, and conducts an experiment on the redistribution and evolution of bubbles affected by gravity instability through the above preparation process, analyzes the law of bubble ripening mass transfer under the influence of gravity, and is of great significance for evaluating the long-term safety and stability of carbon dioxide geological storage projects.

[0005] The technical solution adopted by the present invention is as follows:

[0006] 1. A device for simulating bubble mass transfer in fluids based on a microfluidic chip:

[0007] It includes a gas-liquid co-injection module, a microfluidic chip, a microfluidic chip fixing module, a waste liquid collection tank, a microscope, and a control machine; the microfluidic chip is installed on the microfluidic chip fixing module, the inlet and outlet of the microfluidic chip are respectively communicated with the outlet of the gas-liquid co-injection module and the inlet of the waste liquid collection tank, both the gas-liquid co-injection module and the microscope are connected to the control machine, and the microscope is used for real-time imaging of the bubble preparation process in the fluid within the microfluidic chip.

[0008] The described gas-liquid injection module includes a carbon dioxide collection bottle, a stop valve, a drainage tube, a pressure controller, an organic solvent collection tube, and a diversion tube. The outlets of the carbon dioxide collection bottle and the organic solvent collection tube are both connected to one end of the pressure controller through the drainage tube. A stop valve is provided on the drainage tube from the carbon dioxide collection bottle to the pressure controller. The other end of the pressure controller is connected to the injection port of the microfluidic chip through the diversion tube, and a stop valve is provided on the diversion tube. The carbon dioxide collection bottle is used to provide carbon dioxide, the organic solvent collection tube is used to provide fluid, and the pressure controller is connected to the control machine.

[0009] The pore depth of the described microfluidic chip is greater than the pore throat depth. The pore depth of the microfluidic chip is 30μm - 35μm, and the pore throat depth of the microfluidic chip is 10μm - 12μm.

[0010] The described microfluidic chip fixing module includes an aluminum fixing fixture, a fixing groove, and a sealing clamp block; the microfluidic chip is fixedly installed on the fixing groove of the aluminum fixing fixture. The sealing clamp block is installed on the side of the aluminum fixing fixture through bolts, and there is a gap between the aluminum fixing fixture and the sealing clamp block. The sealing clamp block is used to seal and fix the diversion tube. One end of the diversion tube is connected to the injection port of the microfluidic chip, and the other end of the diversion tube passes through the gap between the aluminum fixing fixture and the sealing clamp block and is connected to the pressure controller.

[0011] The described microfluidic chip includes an injection port, a discharge port, and a porous medium region; the injection port and the discharge port are respectively arranged on both sides of the porous medium region. The porous medium region is mainly formed by arranging a number of double-depth pore units in a rectangular spaced array. Both the injection port and the discharge port are connected to the porous medium region through a number of shunt pipelines evenly distributed along the length direction of the microfluidic chip. The discharge port of the microfluidic chip is connected to the waste liquid collection tank.

[0012] The described microfluidic chip is manufactured by an etching process.

[0013] II. A method for simulating bubble mass transfer in a fluid based on a microfluidic chip, comprising the following steps:

[0014] Step S1: First, a microfluidic chip is manufactured by an etching process, and a dyed organic solvent is prepared.

[0015] Step S2: Then, a gas-liquid injection module is used to inject gas and liquid into the microfluidic chip to form bubbles in the microfluidic chip.

[0016] Step S3: Then, the microfluidic chip is fixed on the microfluidic chip fixing module.

[0017] Step S4: Observe the process of the redistribution and evolution of bubbles in the microfluidic chip affected by gravity instability under microgravity or hypergravity conditions, and obtain the law of bubble ripening and mass transfer under microgravity or hypergravity conditions.

[0018] The specific content of the said Step S2 is as follows:

[0019] First, place the processed microfluidic chip on the stage of the microscope, inject the dyed organic solvent into the organic solvent collection tube, and use the pressure controller in the gas-liquid injection module to make the carbon dioxide collection bottle and the organic solvent collection tube input gases and liquids with stable air pressure into the microfluidic chip. After the two-way liquids and one-way gas are mixed in the pipeline, bubbles are formed and injected into the microfluidic chip through the shunt pipeline. Use the microscope to monitor the existence state of the bubbles in the microfluidic chip in real time. When the bubbles exist in the pores of the microfluidic chip in the form of residual capture, the preparation of the microfluidic chip is completed.

[0020] The specific content of the said Step S3 is as follows:

[0021] Take the prepared microfluidic chip off the stage of the microscope and install it on the microfluidic chip fixing module. Seal and clamp the diversion tube connected to the injection port of the microfluidic chip through the sealing clamp block, so that the inside of the microfluidic chip is in a closed environment. After a preset time, cut off the diversion tube between the sealing clamp block and the pressure controller.

[0022] Under microgravity conditions, the specific steps of the said Step S4 are as follows:

[0023] Adjust the microfluidic chip to a preset tilt angle, observe the mass transfer law of the bubbles in the microfluidic chip under microgravity conditions, and then obtain the law of bubble ripening and mass transfer affected by microgravity under actual working conditions;

[0024] Under hypergravity conditions, the specific steps of the said Step S4 are as follows:

[0025] Place the microfluidic chip fixing module installed with the microfluidic chip on the hanging basket of the centrifuge, start the centrifuge. When the centrifugal acceleration reaches N times the gravitational acceleration and stabilizes, observe the mass transfer law of the bubbles in the microfluidic chip under the Ng hypergravity condition, and then obtain the law of bubble ripening and mass transfer affected by hypergravity under actual working conditions.

[0026] The present invention uses a microscope to prepare a model, seals bubbles in a microfluidic chip with dual-depth pores through a gas-liquid co-injection method, fixes the bubbles in the pore structure using a microfluidic chip fixing module, and conducts an experiment on the redistribution and evolution of bubbles affected by gravity instability through the above preparation process to analyze the law of bubble ripening and mass transfer under the influence of gravity. The present invention can change the pore distribution in the microfluidic chip to prepare and seal bubble or multiphase biological reaction flows, providing a guarantee for subsequent mass transfer / reaction experiments, and is of great significance for evaluating the long-term safety and stability of carbon dioxide geological storage projects.

[0027] The present invention can stably mix and inject gas and liquid into a microfluidic chip using a pressure controller under a microscope to form bubbles in the pores of the microfluidic chip, and conduct an experiment on the ripening process of multiphase bubbles under a specific environment after sealing; it can also inject fluid into the microfluidic chip using a pressure controller under a microscope to complete a single-phase displacement test or inject biological reaction fluid to complete a multiphase biological reaction flow experiment. The device is used to realize the preparation and sealing functions of single-phase and multiphase fluids in the pore structure of the microfluidic chip, providing a guarantee for subsequent observation experiments, which is very helpful for evaluating the long-term safety and stability of carbon dioxide geological storage projects.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. The present invention adopts a structural design of dual-depth pore units, which can restore the residual capture state of bubbles in rock pores.

[0030] 2. The present invention can change the pore distribution in the microfluidic chip, inject different fluids, and conduct different single / multiphase fluid tests.

[0031] 3. The present invention seals the microfluidic chip and provides a stable guarantee for bubble experiments.

[0032] 4. The present invention is very helpful for subsequent observation of the long-term evolution process of bubbles in porous media and is of great significance for evaluating the long-term safety and stability of carbon dioxide geological storage projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a diagram of the bubble model preparation device of the present invention;

[0034] Figure 2 is a schematic diagram of the structure of the microfluidic chip of the present invention;

[0035] Figure 3 is a schematic diagram of the microfluidic chip sealing and fixing module.

[0036] In the figure: 1 - carbon dioxide collection bottle; 2 - stop valve; 3 - drainage tube; 4 - pressure controller; 5 - organic solvent collection tube; 6 - microfluidic chip; 7 - waste liquid collection tank; 8 - microscope; 9 - gas-liquid injection module; 10 - control machine; 11 - shunt pipeline; 12 - injection port; 13 - outlet; 14 - pore; 15 - pore throat; 16 - double-depth pore unit; 17 - microfluidic chip fixing module; 18 - bolt; 19 - diversion tube; 20 - fixing groove; 21 - sealing clip block. Specific implementation manner

[0037] The present invention will be described in detail below in combination with specific implementation cases. The following implementation cases will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form.

[0038] As Figure 1 shown, the device includes a gas-liquid injection module 9, a microfluidic chip 6, a microfluidic chip fixing module 17, a waste liquid collection tank 7, a microscope 8 and a control machine 10; the microfluidic chip 6 is installed on the microfluidic chip fixing module 17, and the inlet and outlet of the microfluidic chip 6 are respectively communicated with the outlet of the gas-liquid injection module 9 and the inlet of the waste liquid collection tank 7. Both the gas-liquid injection module 9 and the microscope 8 are connected to the control machine 10, and the microscope 8 is used to perform real-time imaging on the bubble preparation process in the fluid in the microfluidic chip 6.

[0039] When performing a bubble mass transfer simulation experiment under hypergravity conditions, the simulation device of the present invention is placed on the hanging basket of a centrifuge. The gas-liquid injection module 9 is used to stably inject gas and liquid into the microfluidic chip 6 to generate bubbles in the microfluidic chip 6; the microfluidic chip 6 is provided with a double-depth pore unit 16, and the double-depth pore unit 16 is used to independently enclose the bubbles in the pore structure of the microfluidic chip 6 in the form of residual closure; the microfluidic chip fixing module 17 is used to clamp and seal the diversion tube 19 of the gas-liquid injection module 9 after the bubbles are enclosed in the pore structure, so that the bubbles exist in a closed environment. The microfluidic chip 6 is placed in the fixing groove 20 of the microfluidic chip fixing module 17; the waste liquid collection tank 7 is used to collect the excess liquid flowing out during the bubble preparation process; the microscope 8 is used for real-time observation of the input and existence states of the bubbles during the bubble preparation process; the control machine 10 is used to regulate the input pressure of the pressure controller 4 and simultaneously receive the real-time images transmitted by the microscope 8.

[0040] The gas-liquid injection module 9 includes a carbon dioxide collection bottle 1, a stop valve 2, a drainage pipe 3, a pressure controller 4, an organic solvent collection pipe 5, and a diversion pipe 19. The outlets of the carbon dioxide collection bottle 1 and the organic solvent collection pipe 5 are both connected to one end of the pressure controller 4 through the drainage pipe 3. A stop valve 2 is provided on the drainage pipe 3 from the carbon dioxide collection bottle 1 to the pressure controller 4. The other end of the pressure controller 4 is communicated with the injection port 12 of the microfluidic chip 6 through the diversion pipe 19, and a stable pressure is input in the form of two liquids and one gas into the microfluidic chip (6). A stop valve 2 is provided on the diversion pipe 19. The carbon dioxide collection bottle 1 is used to provide carbon dioxide, the organic solvent collection pipe 5 is used to provide fluid, and the pressure controller 4 is connected to the control machine 10.

[0041] The pressure controller 4 is used to input the gas and liquid with stable pressure into the inlet of the microfluidic chip 6 in the form of two liquids and one gas. One-way gas of the carbon dioxide collection bottle 1 is input into the inlet of the microfluidic chip 6 with stable pressure after passing through the pressure controller 4. Two-way liquids of the organic solvent collection pipe 5 are input into the inlet of the microfluidic chip 6 with stable pressure after passing through the pressure controller 4. The outlets of the three pipelines of one-way gas and two-way liquids form a narrow channel. One-way gas and two-way liquids are mixed at the outlets of the three pipelines and then input into the microfluidic chip 6, aiming to continuously input bubbles into the microfluidic chip 6.

[0042] As Figure 2 shown, the inside of the microfluidic chip 6 adopts a double-depth pore structure design, the depth of the pore 14 is greater than the depth of the pore throat 15. The depth of the pore 14 of the microfluidic chip 6 is 30μm - 35μm, and the depth of the pore throat 15 of the microfluidic chip 6 is 10μm - 12μm.

[0043] The microfluidic chip 6 of the present invention adopts a double-depth pore unit 16, and the double-depth pore unit 16 is composed of pores 14 and pore throats 15 with different depths. Compared with the setting where the depths of pores and pore throats in traditional microfluidic chips are the same, the depth of the pore 14 of the microfluidic chip 6 of the present invention is much greater than the depth of the pore throat 15. This near-three-dimensional pore pattern can make the bubbles stably and independently retained in the pore structure of the microfluidic chip.

[0044] As Figure 3 shown, the microfluidic chip fixing module 17 includes an aluminum fixing fixture, a fixing groove 20, and a sealing clamp block 21; the microfluidic chip 6 is fixedly installed on the fixing groove 20 of the aluminum fixing fixture. The sealing clamp block 21 is installed on the side of the aluminum fixing fixture through a bolt 18, and there is a gap between the aluminum fixing fixture and the sealing clamp block 21. The sealing clamp block 21 is used to seal and fix the diversion pipe 19. One end of the diversion pipe 19 is connected to the injection port 12 of the microfluidic chip 6, and the other end of the diversion pipe 19 passes through the gap between the aluminum fixing fixture and the sealing clamp block 21 and is then connected to the pressure controller 4.

[0045] In specific implementation, after the bubbles are independently enclosed in the microfluidic chip 6 in the form of residual capture, the aluminum fixing fixture fixes the microfluidic chip 6, and the diversion tube 19 for injection passes through between the aluminum fixing fixture and the sealing clamp block 21. The sealing clamp block 21 is tightened with the bolt 18 to seal the diversion tube 19, so that the inside of the microfluidic chip 6 is in a closed environment. After stabilizing for a period of time, the diversion tube 19 between the sealing clamp block 21 and the pressure controller 4 is cut off.

[0046] The microfluidic chip 6 includes an injection port 12, a diversion port 13 and a porous medium region; the injection port 12 and the diversion port 13 are respectively arranged on both sides of the porous medium region. The porous medium region is mainly formed by arranging a plurality of double-depth pore units 16 in a rectangular spaced array. Both the injection port 12 and the diversion port 13 are communicated with the porous medium region through a plurality of shunt pipelines 11 uniformly distributed along the length direction of the microfluidic chip 6. The diversion port 13 of the microfluidic chip 6 is communicated with the waste liquid collection tank 7.

[0047] Eight shunt pipelines 11 are arranged on each side of the porous medium region to better retain the bubbles in each pore of the microfluidic chip 6, that is, the bubble saturation degree of the microfluidic chip 6 is the same from top to bottom. The sixteen shunt pipelines 11, the injection port 12, the diversion port 13 and the double-depth pore units 16 of the microfluidic chip 6 are all processed by etching technology.

[0048] The microfluidic chip 6 is processed by etching technology.

[0049] The embodiment of the present invention includes the following steps:

[0050] Step S1: First, a microfluidic chip 6 provided with double-depth pore units 16 is processed by etching technology, and a dyed organic solvent is prepared: an organic solvent with a density close to that of brine is prepared, and the organic solvent is dyed with a dye to facilitate the observation of the presence of bubbles in the microfluidic chip 6;

[0051] Step S2: Then, a gas-liquid injection module 9 is used to inject gas and liquid into the microfluidic chip 6;

[0052] Step S3: Then, the microfluidic chip 6 is fixed on the microfluidic chip fixing module 17;

[0053] Step S4: Under microgravity or hypergravity conditions, observe the process of the redistribution and evolution of the bubbles in the microfluidic chip 6 affected by the instability of gravity, and obtain the law of bubble ripening and mass transfer under microgravity or hypergravity conditions.

[0054] Step S2 is specifically as follows:

[0055] First, place the processed microfluidic chip 6 on the stage of the microscope 8. Connect the carbon dioxide collection bottle 1 and the organic solvent collection tube 5 to the input end of the pressure controller 4 through the drainage tube 3 respectively. Connect the output end of the pressure controller 4 to the injection port 12 of the microfluidic chip 6 through the diversion tube 19. Connect the outlet 13 of the microfluidic chip 6 to the waste liquid collection tank 7. Inject the dyed organic solvent into the organic solvent collection tube 5. Use the pressure controller 4 in the gas-liquid injection module 9 to make the carbon dioxide collection bottle 1 and the organic solvent collection tube 5 input gas and liquid with stable air pressure into the microfluidic chip 6 respectively. The two-way liquid and one-way gas are mixed in the pipeline to form bubbles and are injected into the microfluidic chip 6 through the shunt pipeline 11. Use the microscope 8 to monitor the existence state of the bubbles in the microfluidic chip 6 in real time. The controller 10 receives the image information transmitted back by the microscope 8. When the bubbles are close to saturation and exist in the pores of the microfluidic chip 6 in the form of residual capture, the preparation of the microfluidic chip 6 carrying bubbles is completed.

[0056] Step S3 is specifically as follows:

[0057] Remove the prepared microfluidic chip 6 carrying bubbles from the stage of the microscope 8 and install it on the aluminum fixing fixture of the microfluidic chip fixing module 17. To minimize the disturbance to the bubbles in the chip, seal and clamp the diversion tube 19 connected to the injection port 12 of the microfluidic chip 6 through the sealing clamp block 21 to form a flow-stopping effect, so that the inside of the microfluidic chip 6 is in a closed environment. After stabilizing for a period of time, cut the diversion tube 19 between the sealing clamp block 21 and the pressure controller 4.

[0058] Under microgravity conditions, the specific steps of step S4 are as follows:

[0059] Use the microfluidic chip fixing module 17 to adjust the microfluidic chip 6 to a preset inclination angle, observe the mass transfer law of the bubbles in the microfluidic chip 6 under microgravity conditions, and then obtain the law of bubble ripening and mass transfer under the influence of microgravity under actual working conditions.

[0060] Specifically, the acceleration under microgravity conditions is less than the normal gravitational acceleration g, which can be achieved by tilting the microfluidic chip 6 at a certain angle.

[0061] Under hypergravity conditions, the specific steps of step S4 are as follows:

[0062] Place the microfluidic chip fixing module 17 installed with the microfluidic chip 6 on the hanging basket of the centrifuge. Start the centrifuge. When the centrifugal acceleration reaches N times the gravitational acceleration and stabilizes, observe the mass transfer law of the bubbles in the microfluidic chip 6 under the Ng hypergravity conditions, and then obtain the law of bubble ripening and mass transfer under the influence of hypergravity under actual working conditions.

[0063] The present invention prepares a model using a microscope 8, seals air bubbles in a microfluidic chip 6 of a double-depth pore unit 16 by means of gas-liquid co-injection, closes the air bubbles in a pore structure using a microfluidic chip fixing module 17, and conducts an experiment on the redistribution and evolution of air bubbles affected by gravity instability through the above preparation process to analyze the law of mass transfer during the ripening of air bubbles under the influence of gravity. The present invention can change the pore distribution in the microfluidic chip to conduct single-phase displacement or multi-phase bubble ripening, preparation and encapsulation of multi-phase bioreaction flows, providing a guarantee for subsequent mass transfer / reaction experiments, and is of great significance for evaluating the long-term safety and stability of carbon dioxide geological storage projects.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fluid bubble mass transfer simulation device based on a microfluidic chip, characterized in that: It includes a gas-liquid injection module (9), a microfluidic chip (6), a microfluidic chip fixing module (17), a waste liquid collection tank (7), a microscope (8) and a control machine (10); the microfluidic chip (6) is installed on the microfluidic chip fixing module (17), the inlet and outlet of the microfluidic chip (6) are respectively communicated with the outlet of the gas-liquid injection module (9) and the inlet of the waste liquid collection tank (7), both the gas-liquid injection module (9) and the microscope (8) are connected to the control machine (10), and the microscope (8) is used for real-time imaging of the bubble preparation process in the fluid in the microfluidic chip (6).

2. The fluid bubble mass transfer simulation device based on a microfluidic chip according to claim 1, wherein: The gas-liquid injection module (9) includes a carbon dioxide collection bottle (1), a stop valve (2), a drainage tube (3), a pressure controller (4), an organic solvent collection tube (5) and a diversion tube (19). The outlets of the carbon dioxide collection bottle (1) and the organic solvent collection tube (5) are both connected to one end of the pressure controller (4) through the drainage tube (3). A stop valve (2) is provided on the drainage tube (3) from the carbon dioxide collection bottle (1) to the pressure controller (4). The other end of the pressure controller (4) is communicated with the injection port (12) of the microfluidic chip (6) through the diversion tube (19). A stop valve (2) is provided on the diversion tube (19). The carbon dioxide collection bottle (1) is used to provide carbon dioxide, the organic solvent collection tube (5) is used to provide fluid, and the pressure controller (4) is connected to the control machine (10).

3. The fluid bubble mass transfer simulation device based on a microfluidic chip according to claim 1, characterized in that: The depth of the pores (14) of the microfluidic chip (6) is greater than the depth of the pore throats (15). The depth of the pores (14) of the microfluidic chip (6) is 30 μm to 35 μm, and the depth of the pore throats (15) of the microfluidic chip (6) is 10 μm to 12 μm.

4. A fluid bubble mass transfer simulation device based on a microfluidic chip according to claim 2, characterized in that: The microfluidic chip fixing module (17) includes an aluminum fixing fixture, a fixing groove (20) and a sealing clamp block (21); the microfluidic chip (6) is fixedly installed in the fixing groove (20) of the aluminum fixing fixture. The sealing clamp block (21) is installed on the side of the aluminum fixing fixture through a bolt (18), and there is a gap between the aluminum fixing fixture and the sealing clamp block (21). The sealing clamp block (21) is used to seal and fix the diversion tube (19). One end of the diversion tube (19) is connected to the injection port (12) of the microfluidic chip (6), and the other end of the diversion tube (19) passes through the gap between the aluminum fixing fixture and the sealing clamp block (21) and is connected to the pressure controller (4).

5. The flow - in - fluid bubble mass transfer simulation device based on a microfluidic chip according to claim 2, characterized in that: The microfluidic chip (6) includes an injection port (12), an outlet port (13) and a porous medium region; the injection port (12) and the outlet port (13) are respectively arranged on both sides of the porous medium region. The porous medium region is mainly formed by arranging a number of double-depth pore units (16) in a rectangular spaced array. The injection port (12) and the outlet port (13) are both communicated with the porous medium region through a number of shunt pipelines (11). The outlet port (13) of the microfluidic chip (6) is communicated with the waste liquid collection tank (7).

6. According to claim 2, a fluid bubble mass transfer simulation device based on a microfluidic chip, characterized in that: The microfluidic chip (6) described above is fabricated by etching process.

7. A method for simulating mass transfer of bubbles in a fluid based on a microfluidic chip using the device according to any one of claims 1-6, characterized in that, It includes the following steps: Step S1: First, fabricate the microfluidic chip (6) using the etching process and prepare a dyed organic solvent. Step S2: Then, use the gas-liquid injection module (9) to inject gas and liquid into the microfluidic chip (6) to form bubbles inside the microfluidic chip (6). Step S3: Next, fix the microfluidic chip (6) on the microfluidic chip fixing module (17). Step S4: Observe the process of the redistribution and evolution of the bubbles affected by gravity instability inside the microfluidic chip (6) under microgravity or hypergravity conditions, and obtain the law of bubble ripening mass transfer under microgravity or hypergravity conditions.

8. A method for simulating bubble mass transfer in a fluid based on a microfluidic chip according to claim 7, characterized in that: The specific content of step S2 is as follows: First, place the fabricated microfluidic chip (6) on the stage of the microscope (8), inject the dyed organic solvent into the organic solvent collection tube (5), and use the carbon dioxide collection bottle (1) and the organic solvent collection tube (5) in the gas-liquid injection module (9) to input gas and liquid with stable air pressure into the microfluidic chip (6). After the liquid and gas are mixed to form bubbles, they are injected into the microfluidic chip (6) through the shunt pipeline (11). Use the microscope (8) to monitor the existence state of the bubbles inside the microfluidic chip (6) in real time. When the bubbles exist in the pores of the microfluidic chip (6) in the form of residual capture, the preparation of the microfluidic chip (6) is completed.

9. A method for simulating the mass transfer of bubbles in a fluid based on a microfluidic chip according to claim 7, characterized in that: The specific content of step S3 is as follows: Remove the prepared microfluidic chip (6) from the stage of the microscope (8) and install it on the microfluidic chip fixing module (17). Seal and clamp the diversion tube (19) connected to the injection port (12) of the microfluidic chip (6) through the sealing clamp block (21) so that the inside of the microfluidic chip (6) is in a closed environment. After a preset time, cut the diversion tube (19) between the sealing clamp block (21) and the pressure controller (4).

10. A method for simulating mass transfer of bubbles in a fluid based on a microfluidic chip according to claim 7, characterized in that: Under microgravity conditions, the specific steps of step S4 are as follows: Adjust the microfluidic chip (6) to a preset tilt angle, observe the mass transfer law of the bubbles inside the microfluidic chip (6) under microgravity conditions, and thus obtain the law of bubble ripening mass transfer affected by microgravity under actual working conditions. Under hypergravity conditions, the specific steps of step S4 are as follows: Place the microfluidic chip fixing module (17) equipped with the microfluidic chip (6) on the hanging basket of the centrifuge. Start the centrifuge. When the centripetal acceleration reaches N times the gravitational acceleration and stabilizes, observe the mass transfer law of the bubbles inside the microfluidic chip (6) under the Ng hypergravity condition, and thus obtain the law of bubble ripening mass transfer affected by hypergravity under actual working conditions.

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