CN111060508A - Experimental system and method for researching near-wall ultrasonic cavitation bubble three-dimensional dynamic process - Google Patents
Experimental system and method for researching near-wall ultrasonic cavitation bubble three-dimensional dynamic process Download PDFInfo
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Abstract
The invention discloses an experimental system and method for researching a three-dimensional dynamic process of near-wall ultrasonic cavitation bubbles. The computer is respectively connected with an injection pump, an ultrasonic driving device, a stroboscopic light source and a high-speed camera by utilizing communication interfaces, a computer control signal respectively drives the injection pump to push bubbles to generate, triggers ultrasonic driving to start working so as to provide a power source for an ultrasonic transducer to generate ultrasonic waves, and triggers the stroboscopic light source to synchronously vertically irradiate and focus on a bubble occurrence area to match the high-speed camera to start working so as to record the dynamic process of the three-dimensional angle of the bubbles under the action of the ultrasonic waves. This experimental system utilizes the reflection of the side of right angle prism, and the incident angle and the prism of control stroboscopic light source put the angle, realize the accurate seizure of bubble a plurality of dimension dynamics processes under the ultrasonic action.
Description
Technical Field
The invention relates to the technical field of ultrasonic cavitation bubble dynamics experimental equipment, in particular to an experimental system integrating microbubble generation, ultrasonic driving, an isosceles right-angle triple prism, a pair of vertically-irradiated and focused stroboscopic light sources, a high-speed photography technology, a computer synchronous control technology and image processing software, particularly has the capability of simultaneously observing a near-wall ultrasonic bubble three-dimensional dynamics process from two vertical angles, and more particularly relates to an experimental system and a method for researching the near-wall ultrasonic cavitation bubble three-dimensional dynamics process.
Background
Ultrasonic cavitation refers to the phenomenon that when ultrasonic waves are radiated into liquid, tiny bubbles in the liquid are subjected to pulsation, oscillation, contraction and collapse and destruction along with the change of sound pressure under a certain sound field condition. The acoustic cavitation phenomenon is a very complex process that induces many physical and chemical effects, such as destroying the walls of biological tissues, accelerating the chemical reaction rate, producing destructive erosion, etc. Therefore, the research on the dynamic process of the cavitation bubbles in the ultrasonic field has very important practical significance for the application of the cavitation effect in the industrial and medical aspects.
Initially, scientists were limited by camera functions to recognize and quantify cavitation through the luminescence due to cavitation, chemical reactions due to high temperature, and macroscopic physical phenomena of damaged walls; in order to study the change of the dynamic process of the bubbles in the cavitation process, the motion situation of single-angle cavitation bubbles is shot by a high-speed photography method of Chesterman, Schmic and the like, but the maximum shooting speed can only reach 3000 frames/second due to the limitation of the technology at that time. With the development of the technology, the shooting rate of a high-speed camera can reach 900,000 frames per second in recent years, a necessary equipment foundation is provided for the research of bubble dynamics, Ohl, Laborde, Lauterron and the like research the dynamic process of bubbles under the action of low-frequency ultrasound, and the phenomenon of luminescence around the bubbles is observed macroscopically. However, few studies of the kinetic processes of micron-sized bubbles in multiple dimensions have been made, mainly due to observation techniques and difficulties in controlling and trapping individual microbubbles.
Uemura et al observed the dynamics of cavitation bubbles and acoustic streaming phenomena during cavitation by using a camera, and observed the changes of bubbles by focusing the camera at a single angle, and this experiment only observed bubbles at a local viewing angle, and could not study the complete dynamics of bubbles globally. Robert and the like utilize two vertically-arranged high-speed cameras to photograph synchronously, and shoot dynamic processes of ultrasonic cavitation bubbles at two different angles, but the time of bubble cavitation is calculated in microseconds, the experiment cannot ensure the time synchronism of the high-speed cameras, and large errors may exist in the experiment results. Therefore, no researchers can synchronously and stably observe the dynamic process of the microbubbles under the three-dimensional angle under the action of the ultrasound so far.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an experimental system and method for researching a three-dimensional dynamic process of near-wall ultrasonic cavitation bubbles.
The invention aims to solve the technical problem of providing an experimental system and method for researching the three-dimensional dynamic process of near-wall ultrasonic cavitation bubbles, and provides a necessary experimental research platform for realizing complete visual angle research of a low-frequency ultrasonic cavitation mechanism.
Besides, the three-dimensional dynamics process of various fluids near the wall surface or free field and even microfluid can be experimentally researched by using the experimental system.
The technical scheme adopted by the invention is as follows: an experimental system for researching the three-dimensional dynamic process of near-wall ultrasonic cavitation bubbles comprises a micro bubble collecting generating device, an ultrasonic driving device, an isosceles right triangular prism, a pair of stroboscopic light sources which vertically irradiate and focus one position,
the right-angle side of the isosceles right triangular prism is tightly attached to the wall surface of the bottom of the water tank and is vertically placed, and the length of the right-angle side is slightly smaller than that of the wall surface;
the pair of vertically irradiating and focusing stroboscopic light sources is matched with a high-speed camera to carry out photoelectric precision test measurement on bubbles under the ultrasonic action;
the microbubble generating device mainly comprises a syringe driven by an injection pump and a glass microelectrode;
the ultrasonic driving device drives the ultrasonic transducer to generate ultrasonic waves;
the super energy transducer, the glass microelectrode and the triple prism all extend into the water tank;
the side surface of the isosceles right triangular prism is a reflecting surface with a coated surface, and one of right-angle surfaces faces to the air bubbles and the ultrasonic transducer;
the computer is respectively connected with the injection pump, the ultrasonic driving device, the stroboscopic light source and the high-speed camera by utilizing the communication interfaces, the computer control signals respectively drive the injection pump to push bubbles to generate, trigger the ultrasonic driving to start working so as to provide a power source for the ultrasonic transducer to generate ultrasonic waves, and trigger the stroboscopic light source to synchronously vertically irradiate and focus on a bubble occurrence area to match the high-speed camera to start working so as to record the dynamic process of the three-dimensional angle of the bubbles under the ultrasonic action.
The computer is used for processing the bubble image shot by the high-speed camera through image processing software such as VisualSfM and OpenMVS, and a three-dimensional structure of the bubble is constructed.
The injector is connected with the glass microelectrode through a plastic micro-pipeline.
The glass microelectrode and the ultrasonic transducer are fixed with the water tank by using waterproof glue.
It is a second object of the present invention to provide a method of investigation using an experimental system as described above, comprising the steps of:
1) before the experiment begins, the injection pump, the high-speed camera and the ultrasonic signal generator are connected to a computer terminal; when the experiment starts, the computer terminal gives out control signals which are respectively transmitted to the injection pump, the high-speed camera and the ultrasonic driving device;
2) the injection pump starts to work after receiving the signal, slowly pushes the injector according to the setting, injects the air in the injector into the thin pipe which is connected in advance, and finally generates bubbles in the container;
3) the high speed camera has adjusted the field of view in previous tests to the region where bubbles would appear, where the two stroboscopic light sources are also focused perpendicularly;
4) when the bubble is about to reach the focus position of high-speed camera, supersound drive arrangement and high-speed camera receive simultaneously behind the trigger signal and begin work simultaneously, supersound drive arrangement device produces the signal of telecommunication of certain frequency and carries the ultrasonic transducer who connects with it, ultrasonic transducer receives the signal of telecommunication and converts it into ultrasonic output, the ultrasonic wave acts on the bubble in the container, with wall vertically stroboscopic light source with the bubble on projecting the prism, the right angle prism side is through reflecting on projecting the high-speed camera with the bubble virtual image, high-speed camera shoots down near wall bubble three-dimensional angle ground dynamic process in step under the ultrasonic action simultaneously.
Advantageous effects
The invention relates to an experimental system for researching the dynamic process of ultrasonic cavitation bubbles at a three-dimensional angle, which is an experimental platform integrating a plurality of instruments and technologies such as a micro-bubble generating device, an ultrasonic driving device, a triangular prism, a pair of vertically irradiating and focusing stroboscopic light sources, high-speed photographic equipment, a computer synchronous control technology, image processing software and the like.
This system adds a pair of stroboscopic light source and isosceles right angle prism on original research system's basis, thereby can observe the bubble virtual image in high-speed camera with stroboscopic light source illumination bubble and the right angle limit of vertical incidence prism. This experimental system utilizes the reflection of the side of right angle prism, and the incident angle and the prism of control stroboscopic light source put the angle, realize the accurate seizure of bubble a plurality of dimension dynamics processes under the ultrasonic action.
Drawings
FIG. 1 is a block diagram of the overall structure of an experimental system for studying the three-dimensional dynamics process of near-wall ultrasonic cavitation bubbles according to the present invention;
reference numeral 1: and the computer 2: isosceles right triangular prism 3: the high-speed camera 4: the ultrasonic drive device 5: the injection pump 6: an injector 7: the micro pipeline 8: glass microelectrode 9: the ultrasonic transducer 10: right triangular prism wall surface 11: liquid level 12: an organic glass water tank 13: air bubbles 14, 15: a stroboscopic light source.
Detailed Description
The experimental system for studying the dynamic process of the ultrasonic cavitation bubbles under the three-dimensional angle is described in detail below by combining the embodiment and the attached drawings.
According to the experimental system for researching the dynamic process of the ultrasonic cavitation bubbles under the three-dimensional angle, the stroboscopic light source on one side irradiates the bubbles and vertically enters the right-angle side of the isosceles right-angle triple prism, so that a bubble virtual image can be observed in the high-speed camera, the side surface of the right-angle triple prism reflects, the incident angle of the stroboscopic light source and the arrangement angle of the triple prism are controlled, and the accurate capture of the multiple-dimensional dynamic process of the bubbles under the ultrasonic action is realized.
Fig. 1 shows an experimental system for studying the dynamic process of ultrasonic cavitation bubbles under three-dimensional angles according to the present invention. In the experiment, the computer 1 provides a control signal, the injection pump 5 pushes the injector 6 to generate micro bubbles 13 through the glass microelectrode 8, and the injector 6 is connected with the glass microelectrode 8 through the plastic micro pipeline 7; the ultrasonic driving device 4 drives the ultrasonic transducer 9 to generate ultrasonic waves; the stroboscopic light sources 14 and 15 vertically irradiate and cooperate with the high-speed camera 3 to carry out photoelectric precision test measurement on bubbles under the ultrasonic action; isosceles right prism 2 places in the basin, and the right-angle side pastes the bottom surface of tight basin, can be used for studying the dynamics process of bubble in different dimensions under the ultrasonic action.
The dynamic observation experiment of the bubbles under the action of ultrasound was carried out in a plexiglass water bath 12, into which 12 sufficient degassed pure water was injected, the liquid level 11 in the bath being shown schematically. The glass microelectrode 8 and the ultrasonic transducer 9 both extend into the water tank 12 through round holes on the wall surface of the organic glass water tank 12. In order to ensure the tightness of the plexiglass water channel 12, the glass microelectrodes 8 and the ultrasonic transducers 9 are fixed to the water channel 12 by means of waterproof glue.
The computer 1 is connected with a high-speed camera 3, an ultrasonic driving device 4, an injection pump 5 and stroboscopic light sources 14 and 15 respectively by using communication interfaces. The computer 1 controls signals to respectively drive the injection pump 5 to push and generate bubbles, triggers ultrasonic drive to start working so as to provide a power source for the ultrasonic transducer 9 to generate ultrasonic waves, triggers the stroboscopic light sources 14 and 15 to synchronously vertically irradiate and focus on bubble occurrence areas and cooperates with the high-speed camera 3 to start working so as to record the dynamic process of the bubbles at three-dimensional angles under the action of the ultrasonic waves.
The following is a detailed experimental procedure. Before the experiment, the injection pump, the high-speed camera and the ultrasonic signal generator are connected to a computer terminal. When the experiment is started, the computer terminal gives out control signals which are respectively transmitted to the injection pump, the high-speed camera and the ultrasonic driving device.
1) The injection pump receives a signal to start working, slowly pushes the injector according to the setting, injects air in the injector into the connected thin pipe in advance, and finally generates bubbles in the container.
2) The high speed camera has in previous tests adjusted the field of view to the region where bubbles would appear, in which the two stroboscopic light sources are also focused perpendicularly.
3) When the bubble is about to reach the focus position of high-speed camera, supersound drive arrangement and high-speed camera receive simultaneously behind the trigger signal and begin work simultaneously, supersound drive arrangement device produces the signal of telecommunication of certain frequency and carries the ultrasonic transducer who connects with it, ultrasonic transducer receives the signal of telecommunication and converts it into ultrasonic output, the ultrasonic wave acts on the bubble in the container, with wall vertically stroboscopic light source with the bubble on projecting the prism, the right angle prism side is through reflecting on projecting the high-speed camera with the bubble virtual image, high-speed camera shoots down near wall bubble three-dimensional angle ground dynamic process in step under the ultrasonic action simultaneously.
The experiment system can observe and research three-dimensional dynamic processes of various fluids and microfluids close to the wall surface or free field, and in addition, a three-dimensional dynamic process observation system of the microfluid can be developed on the basis of the experiment system to carry out experiment research.
It should be understood that the embodiments and examples discussed herein are illustrative only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims.
Claims (5)
1. An experimental system for researching the three-dimensional dynamic process of near-wall ultrasonic cavitation bubbles comprises a micro bubble collecting generating device and an ultrasonic driving device, and is characterized by further comprising an isosceles right triangular prism and a pair of stroboscopic light sources which vertically irradiate and focus one position,
the right-angle side of the isosceles right triangular prism is tightly attached to the wall surface of the bottom of the water tank and is vertically arranged;
the pair of vertically irradiating and focusing stroboscopic light sources is matched with a high-speed camera to carry out photoelectric precision test measurement on bubbles under the ultrasonic action;
the microbubble generating device mainly comprises a syringe driven by an injection pump and a glass microelectrode;
the ultrasonic driving device drives the ultrasonic transducer to generate ultrasonic waves;
the super energy transducer, the glass microelectrode and the triple prism all extend into the water tank;
the side surface of the isosceles right triangular prism is a reflecting surface with a coated surface, and one of right-angle surfaces faces to the air bubbles and the ultrasonic transducer;
the computer is respectively connected with the injection pump, the ultrasonic driving device, the stroboscopic light source and the high-speed camera by utilizing the communication interfaces, the computer control signals respectively drive the injection pump to push bubbles to generate, trigger the ultrasonic driving to start working so as to provide a power source for the ultrasonic transducer to generate ultrasonic waves, and trigger the stroboscopic light source to synchronously vertically irradiate and focus on a bubble occurrence area to match the high-speed camera to start working so as to record the dynamic process of the three-dimensional angle of the bubbles under the ultrasonic action.
2. The experimental system for researching the three-dimensional dynamic process of the near-wall ultrasonic cavitation bubbles as claimed in claim 1, wherein the computer is used for processing the bubble images shot by the high-speed camera through image processing software to construct the three-dimensional structure of the bubbles.
3. The experimental system for researching the near-wall ultrasonic cavitation bubble three-dimensional kinetic process as claimed in claim 1, wherein the injector is connected with the glass microelectrode through a plastic micro-pipeline.
4. The experimental system for studying the three-dimensional kinetic process of near-wall ultrasonic cavitation bubbles as claimed in claim 1, wherein the glass microelectrode and the ultrasonic transducer are fixed with the water tank by waterproof glue.
5. A method of investigation using the assay system of claim 1, comprising the steps of:
1) before the experiment begins, the injection pump, the high-speed camera and the ultrasonic signal generator are connected to a computer terminal; when the experiment starts, the computer terminal gives out control signals which are respectively transmitted to the injection pump, the high-speed camera and the ultrasonic driving device;
2) the injection pump starts to work after receiving the signal, slowly pushes the injector according to the setting, injects the air in the injector into the thin pipe which is connected in advance, and finally generates bubbles in the container;
3) the high speed camera has adjusted the field of view in previous tests to the region where bubbles would appear, where the two stroboscopic light sources are also focused perpendicularly;
4) when the bubble is about to reach the focus position of high-speed camera, supersound drive arrangement and high-speed camera receive simultaneously behind the trigger signal and begin work simultaneously, supersound drive arrangement device produces the signal of telecommunication of certain frequency and carries the ultrasonic transducer who connects with it, ultrasonic transducer receives the signal of telecommunication and converts it into ultrasonic output, the ultrasonic wave acts on the bubble in the container, with wall vertically stroboscopic light source with the bubble on projecting the prism, the right angle prism side is through reflecting on projecting the high-speed camera with the bubble virtual image, high-speed camera shoots down near wall bubble three-dimensional angle ground dynamic process in step under the ultrasonic action simultaneously.
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Cited By (2)
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| CN114054428A (en) * | 2021-12-22 | 2022-02-18 | 福州大学 | Research method for auxiliary shooting of ultrasonic cavitation bubbles by using high-speed camera |
| CN114061889A (en) * | 2021-12-14 | 2022-02-18 | 南京航空航天大学 | Ultrasonic same-frequency observation device and method for directly displaying second modal wave |
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