CN110793967A - Device and method for testing electrostatic coalescence microscopic characteristics of liquid drops in flowing process - Google Patents
Device and method for testing electrostatic coalescence microscopic characteristics of liquid drops in flowing process Download PDFInfo
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Abstract
The invention discloses a device and a method for testing the electrostatic coalescence microscopic characteristics of liquid drops in a flowing process, and the technical scheme is as follows: the high-voltage power supply system comprises a signal generator, a power amplifier and an oscilloscope, and the signal is output after being regulated by the power amplifier; the dynamic liquid drop preparation testing system comprises a testing chip and a controller, wherein the testing chip is connected with the controller through an oil phase injection pump and a water phase injection pump; the high-speed camera system comprises a high-speed camera and a collimating lens which are respectively arranged at two sides of the test chip, wherein an optical fiber probe is arranged below the collimating lens, and the optical fiber probe receives a light source and emits a light beam; the synchronous trigger system comprises a synchronous trigger and image acquisition equipment, wherein the image acquisition equipment controls the synchronous trigger to carry out synchronous triggering, and three synchronous trigger signals respectively trigger the power amplifier, the light source and the high-speed camera.
Description
Technical Field
The invention relates to a device and a method for testing electrostatic coalescence microscopic characteristics of liquid drops in a flowing process, which are used for preparing continuous liquid drops in a flowing oil product, testing the microscopic characteristics of the liquid drops in the flowing process such as movement, deformation, fracture, coalescence and the like under the action of an electric field, and researching the influence rules of electric field parameters and oil-water physical properties on the microscopic characteristics of the liquid drops in the flowing process and the transient evolution process of the liquid drops, and belong to the technical field of multiphase separation of oil-gas gathering and transportation systems.
Background
The surface active substance added by the tertiary oil recovery technology such as colloid, asphaltene, inorganic particles, chemical flooding and the like in the crude oil is easy to be adsorbed on an oil-water interface to form a viscoelastic film with certain mechanical strength, so that the oil-water emulsion has good stability. It is difficult to effectively dewater crude oil by gravity settling alone.
The electrostatic coalescence technology is widely applied due to the characteristics of high efficiency, energy conservation and environmental protection. The difference of the electrical properties of the oil phase and the water phase is utilized to enable water drops to vibrate or move directionally through the electrical change and polarization effect of the water drops in the oil in a high-voltage electric field, so that the collision probability of the water drops is increased, the strength of an interface film of the water drops is weakened, the settling process of the water drops is accelerated, and the oil-water separation effect is enhanced. Researchers have conducted a great deal of microscopic experiments on droplet deformation, rupture and coalescence under the action of an electric field, but the problem is that the related researches are mostly conducted under static conditions, and neglect the synergistic effect of flow shearing and the electric field in an electrostatic coalescence device, and the obtained rule is not enough representative. Research shows that in a flowing coalescence system, disturbance of laminar flow or turbulent flow and shearing action of liquid can enhance collision frequency and intensity between water drops and remarkably improve coalescence efficiency of the water drops.
The prior art discloses a crude oil dehydration electrostatic coalescer (CEC), wherein insulated electrodes and metal electrodes are alternately arranged in a vertical coaxial cylinder form, a narrow electrode spacing generates high-strength voltage, and the flow velocity of emulsion is accelerated to obtain a turbulent flow state, so that the mutual collision of dispersed phase water drops is promoted, the migration time between adjacent water drops is shortened, and the crude oil dehydration efficiency is improved. The prior art also discloses a rapid evaluation system and a rapid evaluation method for electrostatic coalescence, which are composed of a power supply device, a small electrostatic coalescer and a measuring device, can realize evaluation on the coalescence effect of the coaxial cylindrical electrostatic coalescer, and provide a basis for the design and equipment model selection of the electrostatic coalescer.
In fact, when the macroscopic electrostatic coalescence equipment works, the change of oil-water physical properties and electric field operation parameters has obvious influence on the micro characteristics of water drops such as movement, deformation, fracture, coalescence and the like and the transient evolution process thereof, and the attraction, drainage and combination processes of the water drops are changed, so that the electrostatic coalescence effect is influenced. The inventor finds that at present, no device and method for testing the microscopic characteristics of the liquid drop under the action of the electric field in the flowing process exist.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention has the first aim of providing the device for testing the electrostatic coalescence micro-characteristics of the liquid drops in the flowing process, which has compact structure, convenient operation and multiple functions.
The second purpose of the invention is to provide a method for testing the electrostatic coalescence microscopic characteristics of the liquid drops in the flowing process, which can synchronously record the electric signals and the evolution process of the microscopic characteristics of the liquid drops in the flowing process and provide experimental basis for deeply analyzing the microscopic characteristics of the liquid drops in the flowing process and the dynamic mechanism of the transient evolution law of the microscopic characteristics.
The invention adopts the following technical scheme:
an in-flow droplet electrostatic coalescence microfeature testing device comprising:
the high-voltage power supply system comprises a signal generator, a power amplifier and an oscilloscope, wherein the signal generator is used for adjusting electric field parameters, signals are output after being subjected to voltage regulation by the power amplifier, and the oscilloscope is used for monitoring and displaying voltage and current signals;
the dynamic liquid drop preparation test system comprises a test chip and a controller, wherein the test chip is connected with the controller through a plurality of oil phase injection pumps and a plurality of water phase injection pumps, and the controller enables oil-water phases to respectively enter the test chip at set flow rates to carry out liquid drop preparation and reaction by controlling the oil phase injection pumps and the water phase injection pumps;
the high-speed camera system comprises a high-speed camera and a collimating lens which are respectively arranged at two sides of the test chip, wherein an optical fiber probe is arranged below the collimating lens, receives a light source and emits a light beam, and the light beam becomes a collimated light beam through the collimating lens to provide light intensity for the shooting of the high-speed camera;
the synchronous trigger system comprises a synchronous trigger and image acquisition equipment, wherein the image acquisition equipment controls the synchronous trigger to carry out synchronous triggering, and three synchronous trigger signals respectively trigger the power amplifier, the light source and the high-speed camera.
Further, the output end of the signal generator is connected with the input end of the power amplifier, and the oscilloscope is connected with the voltage and current monitoring port of the power amplifier.
Further, the collimating lens is perpendicular to the test chip, the optical fiber probe is connected with the light source through an optical fiber, the light source is connected with the output end of the synchronous trigger, and the control end of the synchronous trigger is connected with the image acquisition device.
Further, the high-speed camera is provided with a high-power lens, and the high-power lens is used for shooting the transient evolution process of the microscopic characteristics of the liquid drops under the action of an electric field in the flowing process; the image acquisition equipment is connected with the high-speed camera and used for storing and analyzing pictures shot by the high-speed camera.
Furthermore, the test chip comprises a test micro-sample groove, one end of the test micro-sample groove is communicated with an oil phase micro-channel and a water phase micro-channel, the oil phase micro-channel is connected with an oil phase injection pump, and the water phase micro-channel is connected with a water phase injection pump; the other end of the test micro sample groove is connected with the outlet of the micro channel; one side of the test micro sample groove is provided with an electrode plate I, and the other side of the test micro sample groove is provided with an electrode plate II.
Further, the electrode plate I is grounded with the power amplifier through a low-voltage cable, the electrode plate II is connected with the high-voltage output end of the power amplifier through a high-voltage cable, and a high-voltage electric field is generated between the electrode plate I and the electrode plate II under the power transmission action of the high-voltage cable and the low-voltage cable.
Furthermore, the controller is connected with the test chip through a water phase injection pump, an oil phase injection pump I and an oil phase injection pump II, and the oil phase injection pump I and the oil phase injection pump II are respectively arranged on one side of the water phase injection pump.
Furthermore, the outlet of the micro-channel is connected with a liquid outlet pipe.
Furthermore, the low-voltage cable is provided with a low-voltage electrode connector, and the high-voltage cable is provided with a high-voltage electrode connector.
A method for testing the micro-characteristics of electrostatic coalescence of liquid drops in a flowing process adopts the testing device, and comprises the following steps:
1) injecting a set amount of distilled water into a water phase injection pump, and respectively injecting a set amount of transparent oil into an oil phase injection pump I and an oil phase injection pump II;
2) installing a high-power lens at the front end of a high-speed camera, and sequentially turning on a light source, the high-speed camera and image acquisition equipment;
3) starting a controller, setting oil-water phase speed parameters, and starting an oil phase injection pump I, a water phase injection pump and an oil phase injection pump II;
4) adjusting a high-speed camera to enable the experimental liquid drops to be clearly imaged on an image acquisition interface of image acquisition equipment;
5) turning on a signal generator, and setting electric field signal parameters;
6) turning on an oscilloscope, and then starting a power amplifier;
7) opening a synchronous trigger, setting synchronous signals of a power amplifier, a light source and a high-speed camera, and controlling the synchronous trigger to synchronously trigger by using image acquisition equipment; the image acquisition equipment and the oscilloscope synchronously acquire the transient evolution process of the microscopic characteristics of the liquid drops under the action of the electric field and the electric field output signal in the flowing process;
8) changing the electrical output parameters of the signal generator or the physical properties of the transparent oil product and the water drops, repeating the steps 1) to 7), and researching the influence of the electric field parameters and the oil-water physical properties on the microscopic characteristics of the liquid drops under the action of the electric field in the flowing process and the transient evolution process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can accurately control, display and record the electric field parameters by adjusting the signal generator and the oscilloscope, and is convenient for accurately evaluating the influence of the electric field parameters on the microscopic characteristics of the liquid drops in the flowing process and the transient evolution rule thereof; the high-voltage power amplifier, the light source and the high-speed camera can be synchronously triggered through the synchronous trigger, so that the problem of synchronization of the electric field, the light source and the liquid drop microscopic characteristic evolution process is solved, and the excitation-response relation of the high-voltage power amplifier, the light source and the high-speed camera is accurately analyzed;
(2) the invention adopts a micro-channel method to prepare liquid drops, and can change the quantity, the particle size and the distance of the liquid drops by adjusting the relative flow rate of oil and water phases, thereby carrying out the test of single-liquid-drop deformation rupture reaction and liquid-drop clustering and reaction in dynamic oil under the condition of different particle sizes, or carrying out the test of double-liquid-drop clustering and reaction by increasing the number of micro-channels;
(3) according to the invention, the electrode plate, the high-voltage cable and the like are poured in the test chip, so that the problem of electric breakdown of the electrode plate is avoided, and the operation safety is ensured;
(4) the invention can accurately capture the micro characteristics of the movement, deformation, fracture, coalescence and the like of water drops in oil under the action of a high-voltage electric field and the transient evolution process thereof by utilizing a high-speed camera shooting technology, an optical amplification technology and a synchronous triggering technology, and provides basic data for the deep theoretical research of the electrostatic coalescence technology.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a single-drop deformation rupture test chip according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a double-droplet coalescence-testing chip according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a droplet clustering and testing chip according to a third embodiment of the present invention;
the device comprises a test chip, an oil phase injection pump I, an oil phase injection pump 5, a water phase injection pump 6, an oil phase injection pump II, an oil phase injection pump 7, a light source 8, an optical fiber 9, an optical fiber probe 10, a collimating lens 11, a liquid outlet pipe 12, a test chip 13, a high-power lens 14, a high-speed camera 15, an image acquisition device 16, a synchronous trigger 17, a signal generator 18, an oil phase microchannel II, an oil phase microchannel 19, a water phase microchannel 20, an oil phase microchannel I, an oil phase microchannel 21, a low-voltage electrode connector 22, a low-voltage cable 23, an electrode plate I, a microchannel outlet 24, a micro-channel 25, an electrode plate II, a high-voltage cable 26, a high-voltage electrode connector 27, a high-voltage electrode connector 28 and a test micro-sample tank.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected directly or indirectly through an intermediate medium, or the two components can be connected internally or in an interaction relationship, and the terms can be understood by those skilled in the art according to specific situations.
In order to solve the technical problems, the invention provides a device and a method for testing the microscopic features of electrostatic coalescence of liquid drops in a flowing process.
The first embodiment is as follows:
the invention is described in detail below with reference to fig. 1-2, and specifically, the structure is as follows:
the embodiment provides a device for testing the electrostatic coalescence microscopic features of liquid drops in a flowing process, which comprises a high-voltage power supply system, a dynamic liquid drop preparation testing system, a high-speed camera system and a synchronous triggering system, wherein the high-speed camera technology, an optical amplification technology, a synchronous triggering technology and a microchannel reaction technology are utilized to capture and shoot the microscopic features of the liquid drops in the flowing process, such as movement, deformation, fracture, coalescence and the like under the action of an electric field and the transient evolution process of the microscopic features.
In this embodiment, when two mutually insoluble liquids (oil and water) meet at the intersection of the micro-channels under the driving of the injection pump, the dispersed phase liquid is pinched off by the continuous phase liquid to form droplets under the action of liquid-liquid interfacial tension and shearing force, so as to realize the preparation of continuous droplets in the dynamic oil. Because the electrical properties of oil products and water drops are different, the water drops in the oil have polarization effect in a high-voltage electric field, so that the water drops vibrate or move directionally, the collision probability of the water drops is increased, the strength of an interface film of the water drops is weakened, the settling process of the water drops is accelerated, and the oil-water separation effect is enhanced. Based on a high-speed camera shooting technology, an optical amplification technology and a synchronous triggering technology, the movement, deformation, fracture, coalescence and other microscopic features of the water drops in the process are researched, and the evolution law of the microscopic features is obtained.
Specifically, the high-voltage power supply system comprises a signal generator 17, a power amplifier 2 and an oscilloscope 1, wherein the power amplifier 2 adopts a high-voltage power amplifier. The output end of the signal generator 17 is connected with the input end of the power amplifier 2, the electric field parameters are adjusted through the signal generator 17, and the signals are output after being adjusted in voltage through the power amplifier 2. The oscilloscope 1 is connected with a voltage and current monitoring port of the power amplifier 2 and is used for monitoring and displaying voltage and current signals.
The high-speed camera system comprises a light source 7, an optical fiber 8, an optical fiber probe 9, a collimating lens 10, a high-speed camera 14 and image acquisition equipment, wherein the high-speed camera 14 is used for shooting the transient evolution process of the microscopic characteristics of liquid drops under the action of an electric field in the flowing process, and the image acquisition equipment 15 is connected with the high-speed camera 14 and used for storing and analyzing pictures shot by the high-speed camera 14. Wherein the image acquisition device 15 is a computer.
The high-speed camera 14 is provided with a high-power lens 13 at the front end, and the high-power lens 13 and the collimating lens 10 are symmetrically arranged relative to the test chip 12 and are vertical to the test chip 12; the high power lens 13 is located above the test chip 12, and the collimating lens 10 is located below the collimating lens 10. The optical fiber probe 9 is connected with the light source 7 through the optical fiber 8, light generated by the light source 7 is transmitted to the optical fiber probe 9 through the optical fiber 8 to be emitted, light beams emitted by the optical fiber probe 9 become collimated light beams through the collimating lens 10, the observation field is illuminated, and light intensity required by the high-speed camera 14 during shooting is provided.
The synchronous trigger system comprises a synchronous trigger 16 and an image acquisition device 15, wherein a control end of the synchronous trigger 16 is connected with the image acquisition device 15, and an output end of the synchronous trigger 16 is respectively connected with trigger ends of the power amplifier 2, the light source 7 and the high-speed camera 4. The image acquisition equipment 15 controls the synchronous trigger 16 to perform synchronous triggering, and three synchronous trigger signals of the synchronous trigger 16 respectively trigger the power amplifier 2, the light source 7 and the high-speed camera 14.
The dynamic liquid drop preparation testing system comprises a controller 3, an oil phase injection pump I4, a water phase injection pump 5, an oil phase injection pump II6, a testing chip 12 and a liquid outlet pipe 11, wherein one end of the testing chip 12 is connected with the controller 3 through the oil phase injection pump I4, the water phase injection pump 5 and the oil phase injection pump II6, and the oil phase injection pump I4 and the oil phase injection pump II6 are respectively arranged on two sides of the water phase injection pump 5; the other end of the test chip 12 is connected with the liquid outlet pipe 11. The controller 3 controls the oil phase injection pump I4, the water phase injection pump 5 and the oil phase injection pump II6 to make the oil phase and the water phase enter the test chip 12 at a certain flow rate to perform the preparation and reaction of liquid drops, and then the liquid is discharged from the liquid outlet pipe 11.
Further, the test chip 12 includes an oil phase microchannel I18, a water phase microchannel 19, an oil phase microchannel II20, a low voltage electrode connector 21, a low voltage cable 22, an electrode plate I23, a microchannel outlet 24, an electrode plate II25, a high voltage cable 26, a high voltage electrode connector 27, and a test micro-sample tank 28, wherein one end of the test micro-sample tank 28 is communicated with the oil phase microchannel I20, the oil phase microchannel II18, and the water phase microchannel 19, the oil phase microchannel I20 is connected with the oil phase injection pump I4, the oil phase microchannel II18 is connected with the oil phase injection pump II6, and the water phase microchannel 19 is connected with the water phase injection pump 5. The other end of the test micro-sample groove 28 is connected with the micro-channel outlet 24, and the micro-channel outlet 24 is connected with the liquid outlet pipe 11. The droplets were reacted in test micro-chamber 28 after being prepared in oil phase microchannel I20, water phase microchannel 19, and oil phase microchannel II18, and then discharged from microchannel outlet 24.
One side of the test micro-sample groove 28 is provided with an electrode plate I23, and the other side is provided with an electrode plate II 25. The electrode plate I23 is connected with a low-voltage cable 22, and the low-voltage cable 22 is provided with a low-voltage electrode joint 21; the electrode plate II25 is connected with a high-voltage cable 26, and the high-voltage cable 26 is provided with a high-voltage electrode joint 27. The high voltage electrode connector 27 is connected with the high voltage output end of the power amplifier 2, the low voltage electrode connector 21 is commonly grounded with the power amplifier 2, and a high voltage electric field is generated between the electrode plate I23 and the electrode plate II25 through the power transmission action of the high voltage cable 26 and the low voltage cable 22.
Specifically, the test chip 12 is made of polydimethylsiloxane, and the low-voltage electrode connector 21, the low-voltage cable 22, the electrode plate I23, the electrode plate II25, the high-voltage cable 26 and the high-voltage electrode connector 27 are poured therein according to a certain arrangement, so that the operation safety is ensured. The oil phase microchannel I18, the water phase microchannel 19, the oil phase microchannel II20, the microchannel outlet 24, and the test micro reservoir 28 are formed by photolithography on the surface of the test chip 12 and then bonding them.
The method for researching the microscopic characteristics of the liquid drop under the action of the electric field and the transient evolution process of the liquid drop in the flowing process by utilizing the electrostatic coalescence microscopic characteristic testing device comprises the following steps of:
1) taking a proper amount of transparent oil and distilled water, injecting the transparent oil into an oil phase injection pump I4 and an oil phase injection pump II6, and injecting the distilled water into a water phase injection pump 5.
2) The high power lens 13 is installed at the front end of the high speed camera 14, and the light source 7, the high speed camera 14 and the image acquisition device 15 are sequentially turned on.
3) And (3) opening the controller 3, and starting the oil phase injection pump I4, the water phase injection pump 5 and the oil phase injection pump II6 after setting the oil-water phase speed parameters.
4) And adjusting the high-speed camera 14 to clearly image the experimental liquid drop on an image acquisition interface of the image acquisition equipment 15.
5) And opening the signal generator 17, and setting the waveform, amplitude, frequency and pulse width of the electric field signal according to the experimental requirements to output a signal.
6) The oscilloscope 1 is turned on.
7) The power amplifier 2 is started.
8) And (3) turning on the synchronous trigger 16, setting synchronous signals of the power amplifier 2, the light source 7 and the high-speed camera 14 according to experimental requirements, and controlling the synchronous trigger 16 to synchronously trigger by using the image acquisition equipment 15. The image acquisition device 15 and the oscilloscope 1 synchronously acquire the transient evolution process of the movement, deformation, fracture, coalescence and other microscopic features of the liquid drop under the action of the electric field in the flowing process and the electric field output signal.
9) Changing the electrical output parameters of the signal generator 17 or changing the physical properties of the transparent oil product and the water drops, and repeating the testing steps 1) -8) to study the influence of the electric field parameters and the oil-water physical properties on the microscopic characteristics of the single liquid drops under the action of the electric field in the flowing process and the transient evolution process.
In the embodiment, by adjusting the signal generator 17 and the oscilloscope 1, the electric field parameters can be accurately controlled, displayed and recorded, so that the influence of the electric field parameters on the microscopic characteristics of the liquid drops in the flowing process and the transient evolution rule of the liquid drops can be accurately evaluated; the power amplifier 2, the light source 7 and the high-speed camera 14 can be synchronously triggered through the synchronous trigger 16, so that the problem of synchronization of the electric field, the light source and the liquid drop microscopic characteristic evolution process is solved, and the excitation-response relation of the liquid drop microscopic characteristic evolution process is accurately analyzed.
The method adopts a microchannel method to prepare the liquid drops, and can change the quantity, the particle size and the distance of the liquid drops by adjusting the relative flow velocity of oil and water phases, thereby carrying out the test of single-liquid-drop deformation rupture reaction and liquid-drop clustering and reaction in the dynamic oil under the condition of different particle sizes, or carrying out the test of double-liquid-drop clustering and reaction by increasing the number of the microchannels. The electrode plate, the high-voltage cable 26 and the like are poured in the test chip 12, so that the problem of electric breakdown of the electrode plate is avoided, and the operation safety is ensured.
Example two:
as shown in fig. 3, in this embodiment, on the basis of the first embodiment, a set of controller, an oil phase injection pump I, a water phase injection pump, an oil phase injection pump II, an oil phase microchannel I, a water phase microchannel, and an oil phase microchannel II is added, and the two controllers are set to have the same parameters, so that the test of the microscopic characteristics of the movement, deformation, coalescence and the like of the double droplets under the action of the electric field in the flowing process can be realized.
Example three:
as shown in fig. 4, in this embodiment, based on the first embodiment, the relative flow rates of the oil phase and the water phase are adjusted to reduce the distance between the droplets, so that the number of the droplets entering the test micro-sample groove is increased, and the droplets are stacked in the test sample groove to form a droplet group, thereby realizing the test of the micro-features such as the movement, deformation, coalescence and the like of the droplet group under the action of the electric field in the flowing process.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An in-flow droplet electrostatic coalescence microfeature testing device, comprising:
the high-voltage power supply system comprises a signal generator, a power amplifier and an oscilloscope, wherein the signal generator is used for adjusting electric field parameters, signals are output after being subjected to voltage regulation by the power amplifier, and the oscilloscope is used for monitoring and displaying voltage and current signals;
the dynamic liquid drop preparation test system comprises a test chip and a controller, wherein the test chip is connected with the controller through a plurality of oil phase injection pumps and a plurality of water phase injection pumps, and the controller enables oil-water phases to respectively enter the test chip at set flow rates to carry out liquid drop preparation and reaction by controlling the oil phase injection pumps and the water phase injection pumps;
the high-speed camera system comprises a high-speed camera and a collimating lens which are respectively arranged at two sides of the test chip, wherein an optical fiber probe is arranged below the collimating lens, receives a light source and emits a light beam, and the light beam becomes a collimated light beam through the collimating lens to provide light intensity for the shooting of the high-speed camera;
the synchronous trigger system comprises a synchronous trigger and image acquisition equipment, wherein the image acquisition equipment controls the synchronous trigger to carry out synchronous triggering, and three synchronous trigger signals respectively trigger the power amplifier, the light source and the high-speed camera.
2. The in-flow droplet electrostatic coalescence microfeature testing device of claim 1, wherein the output of the signal generator is connected to the input of a power amplifier and the oscilloscope is connected to the voltage and current monitoring port of the power amplifier.
3. The device for testing the electrostatic coalescence microfeatures of the liquid droplets in the flow process according to claim 1, wherein the collimating lens is perpendicular to the test chip, the fiber optic probe is connected with a light source through an optical fiber, the light source is connected with the output end of the synchronous trigger, and the control end of the synchronous trigger is connected with the image acquisition equipment.
4. The device for testing the micro-features of the electrostatic coalescence of the liquid drops in the flowing process according to claim 1, wherein the high-speed camera is provided with a high-power lens, and the high-power lens is used for shooting the transient evolution process of the micro-features of the liquid drops in the flowing process under the action of an electric field; the image acquisition equipment is connected with the high-speed camera and used for storing and analyzing pictures shot by the high-speed camera.
5. The device for testing the electrostatic coalescence microscopic characteristics of the liquid drops in the flowing process according to claim 1, wherein the test chip comprises a test micro-sample groove, one end of the test micro-sample groove is communicated with an oil phase micro-channel and a water phase micro-channel, the oil phase micro-channel is connected with an oil phase injection pump, and the water phase micro-channel is connected with a water phase injection pump; the other end of the test micro sample groove is connected with the outlet of the micro channel; one side of the test micro sample groove is provided with an electrode plate I, and the other side of the test micro sample groove is provided with an electrode plate II.
6. The device for testing the electrostatic coalescence microscopic characteristics of the liquid droplets in the flow process according to claim 5, wherein the electrode plate I is commonly grounded with the power amplifier through a low-voltage cable, the electrode plate II is connected with the high-voltage output end of the power amplifier through a high-voltage cable, and a high-voltage electric field is generated between the electrode plate I and the electrode plate II through the electric transmission action of the high-voltage cable and the low-voltage cable.
7. The device for testing the electrostatic coalescence microscopic features of the liquid drops in the flowing process according to claim 1 or 5, wherein the controller is connected with the test chip through a water phase injection pump, an oil phase injection pump I and an oil phase injection pump II, and the oil phase injection pump I and the oil phase injection pump II are respectively arranged on one side of the water phase injection pump.
8. The device for electrostatic coalescence of microfeatures in a flow process of claim 5, wherein the outlet of the microchannel is connected to a drain.
9. The apparatus of claim 6, wherein the low voltage cable is provided with a low voltage electrode connector and the high voltage cable is provided with a high voltage electrode connector.
10. A method for testing the electrostatic coalescence microscopic features of liquid droplets in a flow process, which is characterized by using the testing device as claimed in any one of claims 1 to 9, and comprises the following steps:
1) injecting a set amount of distilled water into a water phase injection pump, and respectively injecting a set amount of transparent oil into an oil phase injection pump I and an oil phase injection pump II;
2) installing a high-power lens at the front end of a high-speed camera, and sequentially turning on a light source, the high-speed camera and image acquisition equipment;
3) starting a controller, setting oil-water phase speed parameters, and starting an oil phase injection pump I, a water phase injection pump and an oil phase injection pump II;
4) adjusting a high-speed camera to enable the experimental liquid drops to be clearly imaged on an image acquisition interface of image acquisition equipment;
5) turning on a signal generator, and setting electric field signal parameters;
6) turning on an oscilloscope, and then starting a power amplifier;
7) opening a synchronous trigger, setting synchronous signals of a power amplifier, a light source and a high-speed camera, and controlling the synchronous trigger to synchronously trigger by using image acquisition equipment; the image acquisition equipment and the oscilloscope synchronously acquire the transient evolution process of the microscopic characteristics of the liquid drops under the action of the electric field and the electric field output signal in the flowing process;
8) changing the electrical output parameters of the signal generator or the physical properties of the transparent oil product and the water drops, repeating the steps 1) to 7), and researching the influence of the electric field parameters and the oil-water physical properties on the microscopic characteristics of the liquid drops under the action of the electric field in the flowing process and the transient evolution process.
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| CN114136623A (en) * | 2021-10-20 | 2022-03-04 | 中国航发四川燃气涡轮研究院 | Cloud and mist water drop volume and liquid water content measuring device and system |
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