CN117664508A - Visual pore-scale mixed convection test simulation device and method - Google Patents
Visual pore-scale mixed convection test simulation device and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000000007 visual effect Effects 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 title claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 164
- 238000002347 injection Methods 0.000 claims abstract description 65
- 239000007924 injection Substances 0.000 claims abstract description 65
- 239000011148 porous material Substances 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000002699 waste material Substances 0.000 claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 238000002474 experimental method Methods 0.000 claims description 10
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 9
- 238000003491 array Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- NGPZWOOKVNRELB-UHFFFAOYSA-N ethane-1,2-diol;methanol Chemical compound OC.OCCO NGPZWOOKVNRELB-UHFFFAOYSA-N 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 18
- 229910002092 carbon dioxide Inorganic materials 0.000 description 9
- 239000001569 carbon dioxide Substances 0.000 description 9
- 239000011435 rock Substances 0.000 description 6
- 239000012267 brine Substances 0.000 description 5
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- SGHZXLIDFTYFHQ-UHFFFAOYSA-L Brilliant Blue Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 SGHZXLIDFTYFHQ-UHFFFAOYSA-L 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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Abstract
The invention discloses a simulation device and a simulation method for a visual pore-scale mixed convection test. The microfluidic chip is arranged on the variable angle fixing system, the primary fluid supply system and the mixed fluid injection system are respectively communicated with two fluid injection ports of the microfluidic chip, the microfluidic chip is communicated with the waste liquid recovery system, the control machine is connected with the industrial camera, and the industrial camera and the control machine are used for collecting and analyzing flow field information of the microfluidic chip in the mixed convection process; the method comprises the steps of manufacturing and installing the micro-fluidic chip, sequentially injecting primary fluid and mixed fluid into the micro-fluidic chip, and acquiring and analyzing flow field information of the micro-fluidic chip in the mixed convection process in real time by utilizing an image acquisition system. The invention selects micro-fluidic chips with different mixed fluids, different pore characteristics and different inclination angles to realize different fluid density, different pore medium seepage characteristics and gravity effects and different viscosities, and has important significance for researching natural convection phenomenon of pore dimensions.
Description
Technical Field
The invention belongs to the field of microfluidic experiments, and particularly relates to a simulation device and a simulation method for a visual pore-scale mixed convection experiment.
Background
Density driven mixed convection in porous media is a fundamental physical phenomenon whose driving force is the high density fluid overlaying the low density fluid, and the system is provided with gravitational instability. The mass transfer phenomenon occurs in the fields of carbon dioxide geological sequestration, solute transport of groundwater aquifers, brine invasion of coastal aquifers, geothermal energy exploitation and the like. Taking carbon dioxide geological sequestration as an example. Carbon dioxide migrates upward under buoyancy after injection into the reservoir and moves horizontally along the top-capped cap layer, molecular diffusion occurs at the carbon dioxide-brine interface, and carbon dioxide dissolution causes the top brine density to increase, thus inducing gravity instability of the fluid system. The high density brine dissolving carbon dioxide is moved to the deep part of the aquifer by convection under the action of gravity, so that fresh brine upward gushes to be contacted with the carbon dioxide at the top, the efficiency of dissolving and capturing the carbon dioxide is greatly improved, and the risk of leakage of the carbon dioxide is reduced. Therefore, research on mass transfer mechanism of mixed convection in porous medium has important significance for judging the safety of carbon dioxide sequestration and improving geological problems such as geothermal energy exploitation efficiency.
Because the convective mixed mass transfer process which cannot be effectively observed by adopting a real rock mass for experiments is adopted, an experimental research method which is convenient for observation and is simple and easy to implement is urgently needed. The microfluidic chip has the advantages of pore structure, reference to real rock mass, repeatability, real-time observation and the like, and is often applied to simulating the underground fluid flow process. The problem of fluid flow based on micro-fluidic chip research on pore size is concentrated on multiphase flow displacement at present, and experimental research on micro-pore size mixed convection is not seen.
Disclosure of Invention
In order to solve the problems in the background technology, the invention aims to provide a visual pore-scale mixed convection test simulation device and method, which are used for realizing accurate capture of a pore-scale mixed convection plume dynamic evolution process and revealing a fluid mass transfer migration rule.
The technical scheme adopted by the invention is as follows:
1. visual pore size mixed convection test simulation device:
the device comprises a primary fluid supply system, a mixed fluid injection system, a variable angle fixing system, an image acquisition system, a waste liquid recovery system and a microfluidic chip;
the device comprises a microfluidic chip, a variable angle fixing system, a primary fluid supply system, a mixed fluid injection system, a waste liquid recovery system, an image acquisition system and an image acquisition system, wherein the variable angle fixing system is arranged on a test bed, the microfluidic chip is arranged on the variable angle fixing system, the primary fluid supply system and the mixed fluid injection system are respectively used for storing primary fluid and mixed fluid, injection ports for the primary fluid and the mixed fluid are respectively arranged at two ends of the microfluidic chip, the primary fluid supply system is communicated with the primary fluid injection ports of the microfluidic chip, the mixed fluid injection ports of the mixed fluid injection system and the microfluidic chip are communicated, an output port of the microfluidic chip is communicated with the waste liquid recovery system, the primary fluid supply system is electrically connected with the image acquisition system, the microfluidic chip is used for simulating a mixed convection process of porous media, and the image acquisition system is used for acquiring and analyzing image information of the microfluidic chip in the mixed convection process in real time.
The microfluidic chip comprises a flow inlet, a flow outlet, a mixed fluid injection port and a porous medium area; the inlet is arranged at one side of the porous medium area, the outlet and the mixed fluid injection port are arranged at the other side of the porous medium area, the porous medium area mainly comprises a plurality of porous medium arrays which are arranged along the length direction of the microfluidic chip, and each porous medium array is mainly formed by arranging circular columns with the same size in a rectangular interval array.
The primary fluid supply system comprises a gas cylinder, a pressure reducing valve, a pressure controller and an inflow control valve, wherein primary fluid is stored in the gas cylinder, an outlet of the gas cylinder is connected with an input end of the pressure controller through a pipeline, the pressure reducing valve is arranged on the pipeline from the gas cylinder to the pressure controller, an output end of the pressure controller is communicated with an inflow opening of the microfluidic chip, and the inflow control valve is arranged on the pipeline from the pressure controller to the microfluidic chip.
The mixed fluid injection system comprises an injection pump, a pressure sensor and a mixed fluid control valve, wherein mixed fluid is stored in the injection pump, an outlet of the injection pump is connected with a mixed fluid injection port of the microfluidic chip through a pipeline, the pressure sensor and the mixed fluid control valve are sequentially arranged on the pipeline from the injection pump to the microfluidic chip, and the pressure sensor and the mixed fluid control valve are respectively used for monitoring and controlling the pressure of the mixed fluid.
The variable angle fixing system comprises a chip fixing clamp, an adjusting knob, a backlight source plate and a supporting arm;
the chip fixing clamp mainly comprises an inclined plate and a horizontal base, the horizontal base is horizontally arranged on the test bed, the bottom end of the inclined plate is movably hinged with one end of the horizontal base through a mechanical shaft, the back surface of the inclined plate is movably connected with the upper surface of the horizontal base through a telescopic supporting arm, an adjusting knob is connected to the horizontal base and is rotationally connected with the supporting arm, and the supporting arm stretches out and draws back through rotating the adjusting knob, so that the angle between the inclined plate and the horizontal base is adjusted; the front of hang plate has offered the chip fixed slot that is used for placing micro-fluidic chip, and the back fixedly connected with back light source board of hang plate.
The image acquisition system comprises a control machine and an industrial camera; the control machine is respectively connected with the pressure controller and the industrial camera, the industrial camera is placed opposite to the microfluidic chip, the industrial camera is used for collecting image information of the microfluidic chip in the mixed convection process, the industrial camera transmits the collected image information to the control machine, and the control machine is used for analyzing flow field information of the mixed convection process in the microfluidic chip.
The waste liquid recovery system comprises an outflow control valve and a waste liquid collecting bottle, wherein an outflow port of the microfluidic chip is communicated with the waste liquid collecting bottle through a pipeline, the outflow control valve is arranged on the pipeline from the microfluidic chip to the waste liquid collecting bottle, and the waste liquid collecting bottle is used for containing fluid flowing out from the microfluidic chip.
The primary fluid injected by the primary fluid supply system adopts deionized water, and the mixed fluid injected by the mixed fluid injection system adopts dye-dyed methanol-ethylene glycol mixed solution or propylene glycol.
2. A visual pore size mixed convection test simulation method comprises the following steps:
s1, manufacturing a microfluidic chip; splicing a plurality of porous medium arrays to form a porous medium area so as to prepare a microfluidic chip with a pore structure;
s2, fixing the prepared microfluidic chip on a chip fixing clamp of a variable angle fixing system, adjusting the angle required by an experiment through an adjusting knob, and opening a backlight source plate to enable a visual field to be bright;
s3, starting the control machine and the industrial camera, and adjusting the focal length and the visual field of the industrial camera so that the microfluidic chip is positioned in the center of the visual field of the industrial camera;
s4, opening an inflow control valve and an outflow control valve, closing a mixed fluid control valve, controlling a primary fluid supply system to inject primary fluid into the microfluidic chip at constant pressure, and closing the inflow control valve and the outflow control valve after the microfluidic chip is full of the primary fluid to form a closed system inside the microfluidic chip;
s5, opening a mixed fluid control valve, controlling a mixed fluid injection system to inject dyed mixed fluid into the microfluidic chip at a constant flow rate, and simultaneously recording injection pressure by using a pressure sensor;
and S6, after the mixed fluid and the primary fluid are mixed, the mixed convection phenomenon occurs in the micro-fluidic chip, the industrial camera is utilized to acquire the image information of the micro-fluidic chip in the mixed convection process in real time, the industrial camera transmits the acquired image information to the controller, the controller analyzes the flow field information of the mixed convection process in the micro-fluidic chip, and the flow field information acquired by the simulation test is used for further analyzing the real flow field information of the fluid under the real working condition.
According to the invention, the microfluidic chip is taken as an experimental carrier and combined with the image analysis system, so that the pore structure in the real geologic body can be simulated and is convenient to observe, the effect of capturing the fluid convection mixing dynamic process in the pore medium system in real time is achieved, and a repeatable and low-cost experimental method is provided for researching the pore scale convection mixing mechanism. The invention is provided with the variable angle fixing system and the injection pump, can realize the accurate control of the boundary conditions of the mixed convection process in the porous medium system by changing the injection pressure and the flow, and can realize the change of the gravity field by changing the inclination angle of the fixing system so as to study the influence of different flow boundaries and different gravity fields on the mixed convection process.
The invention has the beneficial effects that:
1. the invention can realize the visualization of the mixed convection process in various porous medium systems such as rock mass, soil and the like, and captures the dynamic evolution of fluid by using the image acquisition system, thereby having strong operability.
2. The invention utilizes the advantages of strong plasticity and strong repeatability of the microfluidic chip, can personally set a porous medium system, and reduces the pore morphology in the real geologic body.
3. According to the invention, the boundary conditions of the microfluidic chip can be accurately controlled through the injection pump and the pressure sensor.
4. The invention can change the influence factors of a plurality of mixed convection, and realize the difference of fluid density and viscosity by selecting different mixed fluids; different angles are adjusted to realize different gravity conditions; the pore medium permeability is changed by designing different chip structures.
5. The invention has great significance for researching the mechanism of mixed convection mass transfer in the porous medium, and has guiding significance for improving the safety of carbon sequestration engineering and improving geothermal collection efficiency.
6. The experimental device and the method are simple and feasible, the design of the microfluidic chip can meet the personalized requirements, the precision is high, the manufacturing cost is low, and the operability is high.
7. The invention can change the influence factors of multiple mixed convection, realizes different fluid density, different seepage characteristics of pore media, different gravity effects and different viscosity by selecting microfluidic chips with different mixed fluids and different pore characteristics and different inclination angles, and has important significance for the study of natural convection phenomenon of pore dimensions.
Drawings
FIG. 1 is a schematic diagram of an analog device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a microfluidic chip according to an embodiment of the present invention;
FIG. 3 is a schematic view of a variable angle fixing system according to an embodiment of the present invention;
in the figure: a gas cylinder-1; a pressure reducing valve-2; a pressure controller-3; an inflow control valve-4; a syringe pump-5; a pressure sensor-6; a mixed fluid control valve-7; microfluidic chip-8; a fixed clamp-9; an adjusting knob-10; a backlight source plate-11; a control machine-12; an industrial camera-13; an outflow control valve-14 and a waste liquid collecting bottle-15; inlet port-16; an outflow port-17; a mixed fluid injection port-18; porous dielectric region-19; chip fixing groove-20; support arm-21.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the attached drawings and specific examples.
As shown in fig. 1, the device comprises a primary fluid supply system, a mixed fluid injection system, a variable angle fixing system, an image acquisition system, a waste liquid recovery system and a microfluidic chip 8;
the variable angle fixing system is arranged on the test bed, the microfluidic chip 8 is arranged on the variable angle fixing system, a primary fluid supply system and a mixed fluid injection system are respectively used for storing primary fluid and mixed fluid, two ends of the microfluidic chip 8 are respectively provided with a primary fluid injection port and a mixed fluid injection port of the microfluidic chip 8, the primary fluid supply system is communicated with the primary fluid injection port of the microfluidic chip 8, the mixed fluid injection system is communicated with the mixed fluid injection port of the microfluidic chip 8, an output port of the microfluidic chip 8 is communicated with the waste liquid recovery system, the primary fluid supply system is electrically connected with the image acquisition system, the microfluidic chip 8 is used for simulating a mixed convection process of porous media such as rock mass or soil, and the image acquisition system is used for acquiring and analyzing image information of the microfluidic chip 8 in the mixed convection process in real time.
As shown in fig. 2, the microfluidic chip 8 includes an inlet port 16, an outlet port 17, a mixed fluid injection port 18, and a porous medium region 19; the inflow port 16 is disposed at one side of the porous medium region 19 along the length direction, the outflow port 17 and the mixed fluid injection port 18 are disposed at the other side of the porous medium region 19 along the length direction, the porous medium region 19 mainly comprises a plurality of porous medium arrays arranged along the length direction of the microfluidic chip 8, each porous medium array is mainly formed by arranging circular columns with the same size in a rectangular interval array, the sizes of the circular columns in different porous medium arrays can be inconsistent, the porous medium region 19 can be designed into pore structures with the same/different sizes for seepage channels of homogeneous/heterogeneous stratum, and the real pore structures of rock can also be reduced through rock CT scanning. Fig. 2 is a schematic structural diagram of a microfluidic chip in an embodiment, where circles with different diameters represent particles with different diameters.
The primary fluid supply system comprises a gas cylinder 1, a pressure reducing valve 2, a pressure controller 3 and an inflow control valve 4, wherein primary fluid is stored in the gas cylinder 1, an outlet of the gas cylinder 1 is connected with an input end of the pressure controller 3 through a pipeline, the pressure reducing valve 2 is arranged on the pipeline from the gas cylinder 1 to the pressure controller 3, an output end of the pressure controller 3 is communicated with an inflow port 16 of the microfluidic chip 8, and the inflow control valve 4 is arranged on the pipeline from the pressure controller 3 to the microfluidic chip 8.
The primary fluid supply system is used for providing stable pressure, injecting primary fluid into the microfluidic chip 8, and enabling the microfluidic chip 8 to reach a saturated state
The mixed fluid injection system comprises an injection pump 5, a pressure sensor 6 and a mixed fluid control valve 7, mixed fluid is stored in the injection pump 5, an outlet of the injection pump 5 is connected with a mixed fluid injection port 18 of the microfluidic chip 8 through a pipeline, the pressure sensor 6 and the mixed fluid control valve 7 are sequentially arranged on the pipeline from the injection pump 5 to the microfluidic chip 8, and the pressure sensor 6 and the mixed fluid control valve 7 are respectively used for monitoring and controlling the pressure of the mixed fluid.
The mixed fluid injection system is used for injecting mixed fluid into the microfluidic chip 8 at a constant flow rate, inducing gravity instability of the fluid inside the microfluidic chip 8 and monitoring dynamic change of the pressure of the mixed fluid during injection.
As shown in fig. 3, the variable angle fixing system includes a chip fixing jig 9, an adjusting knob 10, and a backlight source plate 11 and a support arm 21;
the chip fixing clamp 9 mainly comprises an inclined plate and a horizontal base, the horizontal base is horizontally placed on the test bed, the bottom end of the inclined plate and one end of the horizontal base are movably hinged through a mechanical shaft, the back surface of the inclined plate and the upper surface of the horizontal base are movably connected through a telescopic supporting arm 21, an adjusting knob 10 is connected to the horizontal base, the adjusting knob 10 is rotationally connected with the supporting arm 21, and the supporting arm 21 can be telescopic through rotating the adjusting knob 10, so that the angle between the inclined plate and the horizontal base is adjusted; the front of the inclined plate is provided with a chip fixing groove 20 for placing the microfluidic chip 8, and the back of the inclined plate is fixedly connected with a backlight source plate 11.
The back of the inclined plate faces the surface of the horizontal base, and the front of the inclined plate faces the surface away from the horizontal base. The variable angle fixing system is used for fixing the micro-fluidic chip 8 in the center of the visual field range and adjusting the included angle between the micro-fluidic chip 8 and the ground. The chip fixing groove 20 is used for placing the microfluidic chip 8. The support arm 21 is stretched by adjusting the adjusting knob 10, so that the micro-fluidic chip 8 forms different angles with the ground, and the dynamic process of mixing convection under different gravity effects is studied.
The image acquisition system comprises a control machine 12 and an industrial camera 13; the control machine 12 is respectively connected with the pressure controller 3 and the industrial camera 13, the control machine 12 is used for driving the pressure controller 3, the industrial camera 13 is placed opposite to the microfluidic chip 8, the industrial camera 13 is used for collecting image information of the microfluidic chip 8 in a mixed convection process, the industrial camera 13 transmits the collected image information to the control machine 12, the control machine 12 is used for analyzing flow field information of the mixed convection process inside the microfluidic chip 8, and the image collecting system is used for collecting images of the mixed convection process inside the microfluidic chip 8 and analyzing the flow field information.
The waste liquid recovery system comprises an outflow control valve 14 and a waste liquid collecting bottle 15, wherein an outflow port 17 of the microfluidic chip 8 is communicated with the waste liquid collecting bottle 15 through a pipeline, the outflow control valve 14 is arranged on the pipeline from the microfluidic chip 8 to the waste liquid collecting bottle 15, and the waste liquid collecting bottle 15 is used for containing redundant fluid flowing out of the microfluidic chip 8.
The primary fluid injected by the primary fluid supply system can be deionized water, the mixed fluid injected by the mixed fluid injection system can be dye-dyed methanol-ethylene glycol mixed solution or propylene glycol and the like which are mutually dissolved with the primary fluid to enable the density of the primary fluid to be increased, a dye with a certain mass concentration such as brilliant blue is adopted for the mixed fluid used in the experiment before the experiment, the mixed fluid and the primary fluid are mixed to prepare mixed fluid with different mass concentrations, the concentration calibration is carried out on the dyed mixed fluid by using an industrial camera to determine the dynamic evolution process of a fluid concentration front in the experiment, the concentration front specifically refers to the front of solute concentration distribution, and the flow field information comprises the local flow velocity information of the fluid. .
The method specifically comprises the following steps:
s1, manufacturing a micro-fluidic chip 8 with a certain pore structure; splicing a plurality of porous medium arrays to form a porous medium area 19 so as to prepare the microfluidic chip 8 with a pore structure;
step S2, fixing the prepared microfluidic chip 8 on a chip fixing clamp 9 of a variable angle fixing system, adjusting the angle required by an experiment through an adjusting knob 10, and opening a backlight source plate 11 to enable the visual field to be bright;
step S3, starting the control machine 12 and the industrial camera 13, and adjusting the focal length and the visual field of the industrial camera 13 so that the microfluidic chip 8 is positioned at the center of the visual field of the industrial camera 13;
s4, opening the inflow control valve 4 and the outflow control valve 14, closing the mixed fluid control valve 7, controlling a primary fluid supply system to inject primary fluid into the microfluidic chip 8 at a constant pressure through the controller 12, and closing the inflow control valve 4 and the outflow control valve 14 after the microfluidic chip 8 is full of the primary fluid, so that a closed system is formed inside the microfluidic chip 8;
step S5, opening a mixed fluid control valve 7, controlling a mixed fluid injection system to inject dyed mixed fluid into the microfluidic chip 8 at a constant flow rate, and simultaneously recording injection pressure by using a pressure sensor 6;
step S6, after the mixed fluid and the primary fluid are mixed, the mixed convection phenomenon of the mixed fluid and the primary fluid occurs in the micro-fluidic chip 8 (namely, the high-density fluid is covered on the low-density fluid, so that gravity instability is further induced in a fluid system in the micro-fluidic chip 8), the industrial camera 13 is utilized to collect image information of the micro-fluidic chip 8 in the mixed convection process in real time, the industrial camera 13 transmits the collected image information to the controller 12, the controller 12 analyzes flow field information of the mixed convection process in the micro-fluidic chip 8, the migration path and state of the high-density finger flow are analyzed according to the flow field information collected by the simulation test, and further analysis and calculation of real flow field information of the fluid under real working conditions are realized.
Claims (9)
1. A visual pore size mixed convection test simulation device is characterized in that:
comprises a primary fluid supply system, a mixed fluid injection system, a variable angle fixing system, an image acquisition system, a waste liquid recovery system and a microfluidic chip (8);
the device comprises a microfluidic chip (8), a mixed fluid injection system, a primary fluid supply system, a mixed fluid injection system, a waste liquid recovery system, a mixed fluid injection system and an image acquisition system, wherein the variable angle fixing system is arranged on a test bed, the microfluidic chip (8) is arranged on the variable angle fixing system, the primary fluid supply system and the mixed fluid injection system are respectively stored with primary fluid and mixed fluid, injection ports of the primary fluid and the mixed fluid are respectively arranged at two ends of the microfluidic chip (8), the primary fluid supply system is communicated with the primary fluid injection ports of the microfluidic chip (8), the mixed fluid injection system is communicated with the mixed fluid injection ports of the microfluidic chip (8), an output port of the microfluidic chip (8) is communicated with the waste liquid recovery system, the primary fluid supply system is electrically connected with the image acquisition system, the microfluidic chip (8) is used for simulating a mixed convection process of a porous medium, and the image acquisition system is used for acquiring and analyzing image information of the microfluidic chip (8) in the mixed convection process in real time.
2. A visual pore scale mixed convection test simulation apparatus as set forth in claim 1, wherein: the microfluidic chip (8) comprises an inflow port (16), an outflow port (17), a mixed fluid injection port (18) and a porous medium area (19); the inlet (16) is arranged on one side of the porous medium area (19), the outlet (17) and the mixed fluid injection port (18) are arranged on the other side of the porous medium area (19), the porous medium area (19) mainly comprises a plurality of porous medium arrays which are arranged along the length direction of the microfluidic chip (8), and each porous medium array is mainly formed by arranging circular columns with the same size in a rectangular interval array.
3. A visual pore scale mixed convection test simulation apparatus as set forth in claim 2, wherein: the primary fluid supply system comprises a gas cylinder (1), a pressure reducing valve (2), a pressure controller (3) and an inflow control valve (4), primary fluid is stored in the gas cylinder (1), an outlet of the gas cylinder (1) is connected with an input end of the pressure controller (3) through a pipeline, the pressure reducing valve (2) is arranged on the pipeline from the gas cylinder (1) to the pressure controller (3), an output end of the pressure controller (3) is communicated with an inflow port (16) of the microfluidic chip (8), and the inflow control valve (4) is arranged on the pipeline from the pressure controller (3) to the microfluidic chip (8).
4. A visual pore scale mixed convection test simulation apparatus as set forth in claim 2, wherein: the mixed fluid injection system comprises an injection pump (5), a pressure sensor (6) and a mixed fluid control valve (7), mixed fluid is stored in the injection pump (5), an outlet of the injection pump (5) is connected with a mixed fluid injection port (18) of the microfluidic chip (8) through a pipeline, the pressure sensor (6) and the mixed fluid control valve (7) are sequentially arranged on the pipeline from the injection pump (5) to the microfluidic chip (8), and the pressure sensor (6) and the mixed fluid control valve (7) are respectively used for monitoring and controlling the pressure of the mixed fluid.
5. A visual pore scale mixed convection test simulation apparatus as set forth in claim 2, wherein: the variable angle fixing system comprises a chip fixing clamp (9), an adjusting knob (10), a backlight source plate (11) and a supporting arm (21);
the chip fixing clamp (9) mainly comprises an inclined plate and a horizontal base, the horizontal base is horizontally arranged on the test bed, the bottom end of the inclined plate is movably hinged with one end of the horizontal base through a mechanical shaft, the back surface of the inclined plate is movably connected with the upper surface of the horizontal base through a telescopic supporting arm (21), an adjusting knob (10) is connected to the horizontal base, the adjusting knob (10) is rotationally connected with the supporting arm (21), and the supporting arm (21) stretches out and draws back through rotating the adjusting knob (10), so that the angle between the inclined plate and the horizontal base is adjusted; the front of the inclined plate is provided with a chip fixing groove (20) for placing the microfluidic chip (8), and the back of the inclined plate is fixedly connected with a backlight source plate (11).
6. A visual pore scale mixed convection test simulation apparatus as set forth in claim 2, wherein: the image acquisition system comprises a control machine (12) and an industrial camera (13); the control machine (12) is respectively connected with the pressure controller (3) and the industrial camera (13), the industrial camera (13) is just opposite to the microfluidic chip (8), the industrial camera (13) is used for collecting image information of the microfluidic chip (8) in a mixing convection process, the industrial camera (13) transmits the collected image information to the control machine (12), and the control machine (12) is used for analyzing flow field information of the mixing convection process inside the microfluidic chip (8).
7. A visual pore scale mixed convection test simulation apparatus as set forth in claim 2, wherein: the waste liquid recovery system comprises an outflow control valve (14) and a waste liquid collecting bottle (15), wherein an outflow port (17) of the microfluidic chip (8) is communicated with the waste liquid collecting bottle (15) through a pipeline, the outflow control valve (14) is arranged on the pipeline from the microfluidic chip (8) to the waste liquid collecting bottle (15), and the waste liquid collecting bottle (15) is used for containing fluid flowing out from the microfluidic chip (8).
8. A visual pore scale mixed convection test simulation apparatus as set forth in claim 2, wherein: the primary fluid injected by the primary fluid supply system adopts deionized water, and the mixed fluid injected by the mixed fluid injection system adopts dye-dyed methanol-ethylene glycol mixed solution or propylene glycol.
9. A visual pore scale mixed convection test simulation method applied to the device of any of claims 1-8, comprising the steps of:
s1, manufacturing a micro-fluidic chip (8); splicing a plurality of porous medium arrays to form a porous medium area (19) so as to prepare a microfluidic chip (8) with a pore structure;
step S2, fixing the prepared micro-fluidic chip (8) on a chip fixing clamp (9) of a variable angle fixing system, adjusting the angle required by an experiment through an adjusting knob (10), and opening a backlight source plate (11) to enable the visual field to be bright;
step S3, starting the control machine (12) and the industrial camera (13), and adjusting the focal length and the visual field of the industrial camera (13) so that the microfluidic chip (8) is positioned at the center of the visual field of the industrial camera (13);
s4, opening an inflow control valve (4) and an outflow control valve (14), closing a mixed fluid control valve (7), controlling a primary fluid supply system to inject primary fluid into a microfluidic chip (8) at constant pressure, and closing the inflow control valve (4) and the outflow control valve (14) after the microfluidic chip (8) is full of primary fluid, so that a closed system is formed inside the microfluidic chip (8);
s5, opening a mixed fluid control valve (7), controlling a mixed fluid injection system to inject dyed mixed fluid into the microfluidic chip (8) at a constant flow rate, and simultaneously recording injection pressure by using a pressure sensor (6);
and S6, after the mixed fluid and the primary fluid are mixed, the mixed convection phenomenon occurs in the micro-fluidic chip (8), the image information of the micro-fluidic chip (8) in the mixed convection process is acquired in real time by using the industrial camera (13), the acquired image information is transmitted to the control machine (12) by the industrial camera (13), the flow field information of the mixed convection process occurring in the micro-fluidic chip (8) is analyzed by the control machine (12), and the analysis of the real flow field information of the fluid under the real working condition is realized according to the flow field information acquired by the simulation test.
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