CN111665170B - Liquid drop impact experimental device for quantitatively controlling deformation and tension of flexible substrate through ventilation - Google Patents
Liquid drop impact experimental device for quantitatively controlling deformation and tension of flexible substrate through ventilation Download PDFInfo
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- CN111665170B CN111665170B CN202010548087.1A CN202010548087A CN111665170B CN 111665170 B CN111665170 B CN 111665170B CN 202010548087 A CN202010548087 A CN 202010548087A CN 111665170 B CN111665170 B CN 111665170B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
Abstract
The invention relates to a liquid drop impact experimental device, in particular to a liquid drop impact experimental device for quantitatively controlling deformation and tension of a flexible substrate through ventilation, and belongs to the field of liquid drop impact behavior control. The device comprises a liquid drop generating system, a substrate deformation control system, a high-speed imaging system, a lifting table and a test bed, wherein the liquid drop generating system is used for generating liquid drops meeting experimental conditions, the substrate deformation control system quantitatively controls deformation and tension of a flexible substrate through ventilation, and the high-speed imaging system is used for capturing an impact process and a substrate deformation process of the liquid drops. The invention has the beneficial effects that: the liquid drop impact experimental device overcomes the defect that the structure of the substrate can only be replaced or modified when the elasticity or flexibility performance parameters of the substrate need to be adjusted in the conventional experimental device, is suitable for developing a large number of parametric experiments, and is beneficial to effectively regulating and controlling the liquid drop impact behavior.
Description
Technical Field
The invention relates to a liquid drop impact experimental device, in particular to a liquid drop impact experimental device for quantitatively controlling deformation and tension of a flexible substrate through ventilation, and belongs to the field of liquid drop impact behavior control.
Background
The liquid drops can stick, spread, bounce or even break after impacting the surface of the solid, and in the industrial and agricultural production, on one hand, the liquid drops need to be capable of rapidly breaking away from or rolling off the surface of a substrate, such as: antifouling product surfaces, automotive windshields, anti-icing coatings, and the like; on the other hand, it is desirable that the droplets adhere to and even spread on the substrate surface, such as: the quality of thermal spraying depends on the adhesion of the metal droplets; the pesticide sprayed onto the plants requires not only that the droplets adhere to the plants but also that they spread out to a certain extent in order to increase the coverage area per unit volume of the pesticide. Also, in many practical applications, the surface on which the droplets impact is not a rigid substrate, but a flexible or elastic substrate. For example: rain strikes the wings of the insect, the leaves of the plant and the raindrop energy trap surface.
The research on the phenomenon of liquid drop impact is always a hot problem in the field of natural science, and with the development of technologies such as surface bionic technology and micro-fluidic technology, researchers are continuously concerned in recent years. The development of the droplet impact experiment is a necessary way for researching the impact behavior of the droplets, and because the droplet size is usually small (in the millimeter and micron order), the transient process of impact is difficult to observe effectively by naked eyes, so a high-speed camera is required. Most of the current liquid drop impact experiments are directed to rigid surfaces, and few flexible or elastic surfaces are involved, and the research on the elastic surfaces is limited to the adoption of fixed elastic structures (such as cantilever beams and two-end fixed beams). The substrate adopted or aimed by the prior liquid drop impact experiment is rigid and non-deformable, or is an elastic or flexible substrate with a fixed structure, and when the elastic or flexible performance parameters (such as elastic rigidity) of the substrate need to be adjusted, the structure of the substrate is only replaced or modified. Therefore, the current liquid drop impact experiment is not suitable for developing a large number of parameterization experiments, and is not beneficial to effectively regulating and controlling the liquid drop impact behavior.
Disclosure of Invention
Therefore, the technical problems to be solved by the invention are as follows: the liquid drop impact experiment device for quantitatively controlling the deformation and the tension of the flexible substrate through ventilation is beneficial to the development of a large number of parametric experiments and the effective regulation and control of liquid drop impact behaviors.
In order to achieve the purpose, the invention provides a liquid drop impact experimental device for quantitatively controlling the deformation and the tension of a flexible substrate by ventilation, which comprises a liquid drop generating system, a substrate deformation control system, a high-speed imaging system, a lifting platform and a test bed.
Preferably, the liquid drop generating system comprises a capillary needle, a liquid conduit and a micro-injector, the capillary needle is connected with the micro-injector through the liquid conduit, the micro-injector is fixedly installed at one end of a support through a fixing plate, and the support is fixedly installed on the lifting table.
Preferably, basement deformation control system includes barometer, sealed chamber, coupling hose, syringe, sealed lid, flexible film, the barometer links to each other with sealed chamber through coupling hose respectively with the syringe, sealed chamber upper end is provided with sealed lid, flexible film sets up in sealed lid upper surface, sealed chamber is fixed to be placed in the test bench upper surface and is located under the capillary syringe needle.
Preferably, the high-speed imaging system comprises a movable support 7 and a high-speed camera and an LED light source, the high-speed camera is fixedly arranged on the movable support, the movable support is arranged on the upper surface of the test bed, and the LED light source is arranged at a position which does not influence experimental observation.
Preferably, a stepping motor is fixedly mounted at the other end of the support, the output end of the stepping motor is connected with a movable baffle, the end face of the movable baffle is connected with a piston rod of the micro-injector, a guide rail is fixedly arranged on the support, and the movable baffle is connected with the guide rail in a sliding manner. The stepping motor drives the piston rod to move, the generation amount of liquid drops of the micro-injector can be accurately controlled, single liquid drops with the size required by an experiment can be generated, and the smooth development of the experiment can be further ensured.
Preferably, the fixed iron stand platform that is provided with on the test bench, the iron stand platform includes second bottom plate, second backup pad and support column, second bottom plate fixed mounting is on the test bench upper surface, the fixed capillary needle support that is provided with in the second backup pad, capillary needle support is used for fixed capillary needle and makes it place along vertical direction. The capillary needle head support is used for ensuring that liquid drops can vertically impact the flexible film downwards, accurate and effective experimental data are obtained, and then experimental efficiency and accuracy are improved.
Preferably, the elevating platform includes first bottom plate, overcoat, locking screw, interior pole and first backup pad, first bottom plate fixed mounting is on the test bench upper surface, overcoat and first bottom plate fixed connection, interior pole and first backup pad fixed connection, be sliding connection and fix through locking screw between interior pole and the overcoat, first backup pad upper end fixed mounting has the support. The height of microinjector can be adjusted by the lifting platform, and the height of the capillary needle head can be adjusted by matching with the iron support, so that the generated liquid drops have different kinetic energies when impacting the flexible film, and the impact behavior of the liquid drops under different kinetic energies can be conveniently researched.
Preferably, the flexible film is a circular polydimethylsiloxane or polyvinyl alcohol siloxane sheet, and the film with controllable thickness is prepared by spin coating on a spin coater.
Preferably, the sealing cover is an annular sealing cover with a radius L =12-16mm, the tension and deformation of the flexible film on the upper surface of the sealing cover are changed by means of extracting or injecting air from the sealing cavity by a syringe, and the pressure in the sealing cavity is measured in real time by a barometer.
Preferably, the high-speed camera is a Japanese NAC high-speed camera with the model of HX-7s, and is used for capturing the impact process of the liquid drop and the deformation process of the substrate.
The invention has the following advantages: the liquid drop impact experimental device overcomes the defect that the structure of the substrate can only be replaced or modified when the elasticity or flexibility performance parameters of the substrate need to be adjusted in the conventional experimental device, is suitable for developing a large number of parametric experiments, and is beneficial to effectively regulating and controlling the liquid drop impact behavior. The stepping motor drives the piston rod to move, the generation amount of liquid drops of the micro-injector can be accurately controlled, single liquid drops with the size required by an experiment can be generated, and the smooth development of the experiment can be further ensured. The capillary needle head support is used for ensuring that liquid drops can vertically impact the flexible film downwards, accurate and effective experimental data are obtained, and then experimental efficiency and accuracy are improved. The height of microinjector can be adjusted by the lifting platform, and the height of the capillary needle head can be adjusted by matching with the iron support, so that the generated liquid drops have different kinetic energies when impacting the flexible film, and the impact behavior of the liquid drops under different kinetic energies can be conveniently researched.
Drawings
FIG. 1: the invention is a first structure schematic diagram;
FIG. 2: a second structural schematic of the present invention;
FIG. 3: the state diagram before the liquid drop impacts the flexible film;
FIG. 4: the state diagram of the liquid drop of the invention after impacting the flexible film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The invention is further illustrated by the following figures and examples:
referring to fig. 1-4, the liquid drop impact experimental device for quantitatively controlling deformation and tension of a flexible substrate by ventilation comprises a liquid drop generating system, a substrate deformation control system, a high-speed imaging system, a lifting platform 2 and a test platform 1. It should be noted that the flexible substrate of the present invention uses a flexible film as an experimental object. The liquid drop generating system comprises a capillary needle 11, a liquid conduit 13 and a micro-injector 14, wherein the capillary needle 11 is connected with the micro-injector 14 through the liquid conduit 13, the micro-injector 14 is fixedly installed at one end of a support 19 through a fixing plate 15, and the support 19 is fixedly installed on the lifting platform 2. In the experiment, the fluid in the micro-syringe 14 is compressed, so that the fluid in the micro-syringe 14 flows out of the capillary needle 11 through the liquid conduit 13, liquid drops with a certain diameter are formed at the outlet of the capillary needle 11, the liquid drops freely fall and impact the substrate of the flexible film 10 at a certain initial speed, and the impact process of the liquid drops is recorded through the high-speed camera 8. The base deformation control system comprises a barometer 3, a sealed cavity 4, a connecting hose 5, an injector 6, a sealed cover 9 and a flexible film 10, wherein the barometer 3 and the injector 6 are respectively connected with the sealed cavity 4 through the connecting hose 5, the sealed cover 9 is arranged at the upper end of the sealed cavity 4, the flexible film 10 is arranged on the upper surface of the sealed cover 9, and the sealed cavity 4 is fixedly arranged on the upper surface of the test bed 1 and is positioned under a capillary needle 11. The high-speed imaging system comprises a movable support 7, a high-speed camera 8 and an LED light source, wherein the high-speed camera 8 is fixedly arranged on the movable support 7, the movable support 7 is arranged on the upper surface of the test bed 1, the LED light source is arranged at a position which does not influence the experimental observation, and the LED light source can be omitted under the condition that the light can meet the experimental requirement. Specifically, the high-speed camera 8 is a Japanese NAC high-speed camera of model HX-7s for capturing the impact process of the liquid droplet and the substrate deformation process.
Referring to fig. 1-2, the support 19 is a U-shaped structure, one end of the support is fixedly provided with the micro syringe 14, the other end of the support is fixedly provided with the stepping motor 17, the output end of the stepping motor 17 is connected with the movable baffle 16, the end surface of the movable baffle 16 is connected with the piston rod of the micro syringe 14, the support 19 is fixedly provided with the guide rail 20, the movable baffle 16 is slidably connected with the guide rail 20, when the movable baffle 16 moves along the guide rail 20, the piston rod is driven to move synchronously, and finally, liquid drops are generated at the bottom outlet of the capillary needle 11. The stepping motor 17 drives the piston rod to move, so that the generation amount of liquid drops of the micro-injector 14 can be accurately controlled, single liquid drops with the size required by an experiment can be generated, and the smooth development of the experiment can be further ensured. It should be noted that, the bottom of the movable barrier 16 is provided with a groove matching with the protrusion of the guide rail 20, and the protrusion of the guide rail 20 can move back and forth in the groove of the movable barrier 16.
Referring to fig. 1-2, an iron stand 18 is fixedly arranged on a test bed 1, the iron stand 18 includes a second bottom plate 18.1, a second support plate 18.2 and a support column 18.3, wherein the mounting height of the second support plate 18.2 on the support column 18.3 can be adjusted by screws, the second bottom plate 18.1 is fixedly mounted on the upper surface of the test bed 1, a capillary needle holder 12 is fixedly arranged on the second support plate 18.2, and the capillary needle holder 12 is used for fixing a capillary needle 11 and enabling the capillary needle to be placed in a vertical direction.
Referring to fig. 1-2, the lifting platform 2 comprises a first base plate 2.1, an outer sleeve 2.2, a locking screw 2.3, an inner rod 2.4 and a first support plate 2.5. Wherein, first bottom plate 2.1 fixed mounting is on 1 upper surface of test bench, and overcoat 2.2 and first bottom plate 2.1 fixed connection, interior pole 2.4 and first backup pad 2.5 fixed connection, be sliding connection and fix through locking screw 2.3 between interior pole 2.4 and the overcoat 2.2, and first backup pad 2.5 upper end fixed mounting has support 19. The height of the micro-injector 14 can be adjusted by the lifting platform 2, and the height of the capillary needle 11 is adjusted by matching with the iron support 18, so that the generated liquid drops have different kinetic energies when impacting the flexible film 10, and the impact behavior of the liquid drops under different kinetic energies can be conveniently researched.
Referring to fig. 1 to 4, the flexible film 10 is a circular Polydimethylsiloxane (PDMS) or polyvinyl siloxane (PVS) sheet, and is prepared by spin coating on a spin coater to have a controllable thickness (thickness of about 100 μm). In the experiment, in order to study the influence of the microstructure of the film on the impact of liquid drops, a silicon wafer with the microstructure can be used as a template, PDMS (polydimethylsiloxane) or PVS (polyvinyl dichloride) is coated on the silicon wafer template in a spin mode, and the flexible film with the microstructure is obtained after demolding. The sealing cover 9 is an annular sealing cover with a radius L =12-16mm, the tension and deformation of the flexible film 10 on the upper surface of the sealing cover 9 are changed by means of the air drawn or injected from the sealing cavity 4 by the syringe 6, and the pressure in the sealing cavity 4 is measured in real time by the barometer 3.
During the experiment, the liquid drop generating system is used for generating the liquid drops meeting the experimental conditions, specifically, the stepping motor 17 is started, the output end of the stepping motor drives the movable baffle 16 to move linearly along the guide rail 20, the movable baffle 16 pushes the piston rod of the micro-injector 14 to move slowly, the fluid in the micro-injector 14 is compressed, the fluid in the micro-injector 14 flows out from the capillary needle 11 through the liquid conduit 13, and the liquid drops meeting the experimental conditions are formed at the outlet of the capillary needle 11. The substrate deformation control system quantitatively controls the deformation and tension of the flexible substrate through ventilation, in particular, the deformation and tension of the flexible film 10 are changed by pumping or injecting a specific volume of air into the sealed cavity 4 through the injector 6, and the pressure in the sealed cavity 4 is measured in real time through the barometer 3. It should be noted that, in the present invention, the extraction or injection of a specific volume of air into the sealed cavity 4 refers to the extraction or injection of air in equal volumes in succession, so as to obtain a set of experimental data with equal difference series of volumes. The high-speed imaging system is used for capturing the impact process of the liquid drop and the deformation process of the substrate, and the deformation parameters of the liquid drop and the substrate are further analyzed and researched through image data obtained by the high-speed imaging system. The liquid drop impact experimental device overcomes the defect that the structure of the substrate can only be replaced or modified when the elasticity or flexibility performance parameters of the substrate need to be adjusted in the conventional experimental device, is suitable for developing a large number of parametric experiments, and is beneficial to effectively regulating and controlling the liquid drop impact behavior.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A liquid drop impact experimental device for quantitatively controlling deformation and tension of a flexible substrate through ventilation is characterized in that: the device comprises a liquid drop generating system, a substrate deformation control system, a high-speed imaging system, a lifting platform and a test bed;
the liquid drop generating system comprises a capillary needle head, a liquid guide pipe and a micro-injector, wherein the capillary needle head is connected with the micro-injector through the liquid guide pipe, the micro-injector is fixedly arranged at one end of a support through a fixing plate, and the support is fixedly arranged on a lifting table;
the base deformation control system comprises a barometer, a sealing cavity, a connecting hose, an injector, a sealing cover and a flexible film, wherein the barometer and the injector are respectively connected with the sealing cavity through the connecting hose;
the high-speed imaging system comprises a movable support, a high-speed camera and an LED light source, wherein the high-speed camera is fixedly placed on the movable support, the movable support is placed on the upper surface of the test bed, and the LED light source is arranged at a position which does not influence experimental observation.
2. The apparatus for droplet impact experiment with quantitative control of deformation and tension of flexible substrate by aeration according to claim 1, wherein: a stepping motor is fixedly installed at the other end of the support, the output end of the stepping motor is connected with a movable baffle, the end face of the movable baffle is connected with a piston rod of the micro-injector, a guide rail is fixedly arranged on the support, and the movable baffle is connected with the guide rail in a sliding manner; the stepping motor drives the piston rod to move, the generation amount of liquid drops of the micro-injector is accurately controlled, single liquid drops with the size required by an experiment are ensured to be generated, and the smooth development of the experiment is further ensured.
3. The apparatus for droplet impact experiment with quantitative control of deformation and tension of flexible substrate by aeration according to claim 2, wherein: an iron stand is fixedly arranged on the test bed and comprises a second bottom plate, a second supporting plate and a supporting column, the second bottom plate is fixedly arranged on the upper surface of the test bed, a capillary needle head support is fixedly arranged on the second supporting plate and used for fixing a capillary needle head and enabling the capillary needle head to be placed in the vertical direction; the capillary needle head support is used for ensuring that liquid drops can vertically impact the flexible film downwards, accurate and effective experimental data are obtained, and then experimental efficiency and accuracy are improved.
4. The apparatus for droplet impact experiment with quantitative control of deformation and tension of flexible substrate by aeration according to claim 1, wherein: the lifting platform comprises a first bottom plate, an outer sleeve, a locking screw, an inner rod and a first supporting plate, the first bottom plate is fixedly arranged on the upper surface of the test platform, the outer sleeve is fixedly connected with the first bottom plate, the inner rod is fixedly connected with the first supporting plate, the inner rod is in sliding connection with the outer sleeve and is fixed through the locking screw, and a support is fixedly arranged at the upper end of the first supporting plate; the height of microinjector can be adjusted by the lifting platform, and the height of the capillary needle head can be adjusted by matching with the iron support, so that the generated liquid drops have different kinetic energies when impacting the flexible film, and the impact behavior of the liquid drops under different kinetic energies can be conveniently researched.
5. The apparatus for droplet impact experiment with quantitative control of deformation and tension of flexible substrate by aeration according to any of claims 1 to 4, wherein: the flexible film is a circular polydimethylsiloxane or polyvinyl alcohol siloxane sheet, and the film with controllable thickness is prepared by spin coating on a spin coater.
6. The apparatus for droplet impact experiment with quantitative control of deformation and tension of flexible substrate by aeration according to claim 5, wherein: the sealing cover is an annular sealing cover with the radius L =12-16mm, the tension and deformation of the flexible film on the upper surface of the sealing cover are changed by means of extracting or injecting air from the sealing cavity through a syringe, and the pressure in the sealing cavity is measured in real time through a barometer.
7. The apparatus for droplet impact experiment with quantitative control of deformation and tension of flexible substrate by aeration according to any of claims 1 to 4, wherein: the high-speed camera selects a Japanese NAC high-speed camera with the model number of HX-7s and is used for capturing the impact process of liquid drops and the deformation process of the substrate.
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| CN112834165B (en) * | 2020-12-31 | 2023-02-03 | 杭州电子科技大学 | Device and method for testing drag force of liquid drop along fiber axial direction airflow |
| CN114460125B (en) * | 2022-01-21 | 2023-11-03 | 西安航空学院 | Experimental device and method for solidifying supercooled liquid drops on metal surface |
| CN114563312B (en) * | 2022-01-27 | 2022-12-06 | 苏州大学 | Method and device for measuring mechanical property of thin film |
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