200 results about "Cavitation bubble" patented technology

The invention provides an acoustic coalescence elimination method for hydrogen bubbles in molten aluminum, and belongs to the technical field of molten aluminum bubble elimination. According to the method, sound field collaborative focusing is achieved by arranging a phase control array transducer set in a molten aluminum smelting furnace, primary gathered sound waves and efficient coalescence sound waves are applied in stages according to bubble size evolution in a double-frequency scanning mode, and the hydrogen bubbles in the molten aluminum are eliminated. A target frequency is dynamically adjusted in combination with a bubble resonance frequency optimization model to match the inherent frequency of a bubble, a sound-bubble coupling dynamic tracking system is used for monitoring bubble evolution triggering stage switching in real time, and a sound field focus point dynamically scans and covers a three-dimensional space area through phase delay control. A delay detection method is adopted to eliminate cavitation bubble interference and accurately measure the hydrogen content, sound intensity and frequency parameters are optimized according to a sound field parameter self-adaptive regulation and control model, and the technical problem that hydrogen bubbles in a molten aluminum deep area are difficult to be effectively driven by sound waves and cannot be fully coalesced and eliminated is solved.

The present invention discloses a method and device for numerical simulation of near-wall single cavitation collapse coupled with boundary motion, comprising: step 1, introducing a physical model of a near-wall single cavitation into a pre-constructed external flow field to obtain a corresponding flow field physical model; step 2, meshing the flow field physical model; setting initial conditions and flow field boundary conditions, and setting a time step that meets the calculation requirements; step 3, setting specific calculation parameters for solving the flow field process, and introducing a fluid volume method to capture the gas-liquid interface; step 4, applying wall vibration in the form of a user-defined function to simulate the cavitation dynamics behavior under vibration impact. The present invention takes into account the influence of wall vibration in the numerical simulation process by coupling boundary motion, and realizes the simulation of the dynamics behavior of near-wall single cavitation under vibration impact conditions. On this basis, the influence of conditions such as vibration frequency on the cavitation collapse process can be further explored, providing theoretical guidance for optimized cavitation suppression design.

The invention relates to a paint coating cavitation erosion resistance evaluation method based on an ultrasonic technology, belongs to the technical field of paint coating performance evaluation, and solves the problem that in the prior art, it is difficult to comprehensively observe and accurately simulate an ultrasonic bubble dynamic process in a laboratory. The method comprises the following steps: preparing a sample wafer on a steel plate by adopting a unified process, placing the sample wafer in an experimental water tank, generating a cavitation bubble group by using an ultrasonic generator to simulate cavitation erosion, collecting data through equipment such as a high-speed camera, a hydrophone and a pressure sensor, and obtaining damage time and area by virtue of an image processing algorithm and a super field depth microscope. And the cavitation erosion resistance is analyzed and evaluated through data processing. Rapid and accurate evaluation can be realized in a laboratory, the test period is shortened, and the cost is reduced; the evaluation accuracy, reliability and repeatability are improved; and a scientific basis can be provided for coating research and development, quality control and engineering application.

The embodiment of the invention provides a method and equipment for measuring phase interface parameters between nuclear reactor fuel assemblies, and belongs to the technical field of thermal hydraulic analysis of nuclear power plants. The method comprises the steps that cavitation bubbles are generated in the flow channel of the special-shaped structure; images of cavitation bubbles in the flow channel of the special-shaped structure in multiple directions are collected; performing three-dimensional reconstruction according to the images of the cavitation bubble in the multiple directions to obtain the volume of the cavitation bubble; the void fraction is determined according to the volume of the void and the total volume of the fluid domain in the special-shaped structure flow channel, and the phase interface parameters comprise the volume of the void and the void fraction. According to the embodiment of the invention, the measurement precision of phase interface parameters can be improved.

The invention discloses automatic cleaning equipment for geothermal well maintenance, and relates to the technical field of geothermal well cleaning equipment.The automatic cleaning equipment comprises a pipeline adaptive cleaning assembly, the pipeline adaptive cleaning assembly extends into a geothermal well and can clean the inner walls of pipelines with different sizes of the geothermal well, and the top of the pipeline adaptive cleaning assembly is connected with a magnetic connecting structure; under the cooperation of the pipeline adaptive cleaning assembly, the shaft joint mechanical arm and the magnetic connecting structure, the whole device can accurately adapt to vertical, bent and variable-diameter pipelines through the cooperation of laser ranging and a lead screw sliding block adjusting structure and the cooperation of a self-driving wheel and a transmission rod structure, the problems of pipe clamping and blind areas of traditional equipment are solved, and the working efficiency is improved. And by means of the arrangement that the focus of ultrasonic waves coincides with the center of high-pressure water flow, the composite effect that cavitation bubble impact is matched with mechanical water flow cleaning is formed, the hard scale removing efficiency is effectively improved, and under the cooperation of the variable-angle inclined spray head and the adjustable spray hole structure, the circumferential direction can be covered, and different scales can be accurately hit.

The invention discloses a cleaning device and a cleaning method for an airplane sewage system, and relates to the technical field of airplane cleaning.By means of the cleaning device and the cleaning method, cleaning liquid in a pipeline assembly is heated through a heating unit, so that the chemical activity of the cleaning liquid is good, and dirt in an airplane sewage discharging pipeline can be treated; the ultrasonic unit can transmit longitudinal high-frequency vibration waves into the cleaning liquid, and cavitation bubbles generate strong shock waves around the airplane blow-off pipeline to repeatedly impact a dirt layer until dirt falls off; meanwhile, greasy dirt excreted by a human body can be decomposed and emulsified, the inner wall of the airplane blow-off pipeline cannot be damaged by ultrasonic waves, the first ultrasonic wave generating unit can prevent dirt or greasy dirt from being bonded in the pipeline assembly, and the second ultrasonic wave generating unit can transmit the ultrasonic waves to the airplane blow-off pipeline; and in each pressure cleaning process, multiple times of bidirectional circulating cleaning are carried out, so that the cleaning effect is better, and solid waste can be thoroughly discharged.

The invention discloses an optical path adjusting system for in-situ dynamic calibration of a pressure sensor based on laser cavitation. In a ship working underwater, a pulse laser is used for emitting a beam of pulse laser, the pulse laser passes through a designed light path adjusting system and then is focused near a calibrated pressure sensor through a light through hole in a cabin wall in the ship, and a laser-induced cavitation phenomenon is generated. A microsecond pressure shock wave generated by cavitation bubbles in a collapse stage is used as an excitation signal to calibrate the pressure sensor in an actual in-situ environment. Meanwhile, a set of algorithm is designed on the basis of a light path adjusting system, and pressure sensors at different positions can be calibrated. According to the light path adjusting system, the required device is simple in structure, the cost is lower, and the system is suitable for popularization.

The present invention provides a centrifugal cavitation generator comprising a housing, an impeller, and a drive device. The impeller is located within the housing and includes a flow guide and a hollow housing. The hollow housing is provided with a flow guide on one side for guiding liquid into the housing, and the other side of the hollow housing is connected to the drive device. The hollow housing is provided with at least one set of through-hole units. The rotation of the impeller causes liquid to flow out through the through-hole units, generating a cavitation cloud. The housing wall is provided with several protrusions, located near the through-hole units on the hollow housing, to collapse the cavitation bubbles. The present invention utilizes the mechanical, thermal, and chemical effects generated by this energy to achieve wastewater degradation and treatment.

An apparatus for sensing cavitation in liquid flowing through a conduit in a housing includes an ultrasonic transducer system having one or more ultrasonic transducers attached to the housing and arranged in acoustic communication with the liquid, and control electronics connected to the ultrasonic transducer system. The control electronics is configured to drive the transducer system to send an ultrasonic signal through the flowing liquid, wherein the transducer system receives the ultrasonic signal and generates an electronic cavitation detection signal representing a strength of the received ultrasonic signal. The control electronics is further configured to process the cavitation detection signal to provide a cavitation measurement signal indicative of whether or not the ultrasonic signal interacted with one or more cavitation bubbles, evaluate the cavitation measurement signal to determine if one or more alarm conditions is met, and output an alarm signal when each of the cavitation alarm condition(s) is met.

A method and apparatus for finishing a surface of a component. The method includes installing the component in an apparatus configured to deliver a flow of abrasives to the surface and to generate cavitation bubbles in a liquid contacting the surface using a cavitation generator that includes an ultrasonic generator configured to generate cavitation bubbles in the liquid contacting the surface by ultrasonic excitation in the liquid or a laser configured to generate cavitation bubbles in the liquid contacting the surface by laser excitation in the liquid; controlling the cavitation generator such that cavitation bubbles are generated to finish the surface by implosion of the cavitation bubbles; and controlling the flow of slurry to the surface so as to finish the surface by abrasion. An apparatus for finishing a surface of a component is also disclosed.

The invention provides an ultrasonic parameter adaptive adjustment and cleaning evaluation method in a wafer cleaning process, and relates to the technical field of semiconductor manufacturing, and the method comprises the steps: calculating sound field energy distribution through collecting wafer surface temperature distribution and cavity vibration response data; based on the temperature gradient and the sound intensity gradient, calculating the micro-flow field distribution of the cleaning fluid, and establishing a cavitation bubble collapse characteristic matrix; recognizing and cleaning a dead zone through singular value decomposition of the feature matrix, and controlling a piezoelectric transducer to generate focused ultrasonic waves; meanwhile, the plasma resonance sensor is used for monitoring the surface adsorption characteristic change and evaluating the cleanliness. According to the invention, real-time self-adaptive adjustment of ultrasonic cleaning parameters is realized, and the cleaning uniformity and efficiency are improved.

The invention belongs to the technical field of water-based cleaning machines, and relates to a water-based cleaning machine applying double impellers to intensify cleaning. The cleaning machine comprises a cleaning machine body, the cleaning machine body comprises a sealing cover, a cleaning machine box body, a supporting column, a water drainage pipe, a one-way valve and a water drainage port, an ultrasonic transducer is arranged below the cleaning machine box body, a cleaning cavity is formed in the cleaning machine box body, and a cleaning basket and a rotating frame which can rotate in the axial direction are arranged in the cleaning cavity. The bidirectional rotary impeller device and the ultrasonic transducer are arranged, the cleaning characteristics of wide coverage and coarse precision of vortex cleaning and the cleaning characteristics of high precision and narrow range of ultrasonic cleaning are combined, and directional barrier breaking is achieved by means of the ultrasonic microscale penetration characteristic aiming at cleaning pain points of complex workpiece blind hole slit structures and high stain adhesive force; the cavitation bubbles are driven to collapse in the slits (smaller than or equal to 1 mm) to generate high-pressure microjet, and the limitation of the single cleaning scale of traditional cleaning is broken through.

The invention discloses a propeller two-phase flow multi-scale cavitation bubble measurement system based on laser digital holography, and belongs to the field of cavitation flow measurement. The device comprises an experiment section, an experiment model, a supporting rotating shaft, a polarization laser, a concave lens, a first convex lens, a second convex lens, a digital camera, a lens, a dimmer, a synchronous triggering system and a data analysis system. Linear polarization laser is emitted by the polarization laser and is collected by the first convex lens after being expanded by the concave lens, the collected light is collected and collimated by the second convex lens after being collected at the focus of the first convex lens, and parallel light is formed and irradiated to a cavitation area generated by the propeller in the experimental section. Part of the light is diffracted and deviated to form object light when passing through the vacuole, the light which does not pass through the vacuole forms reference light, and alternately dark and bright stripes formed by interference of the object light and parallel light are refracted by the dimmer and the lens and recorded on a digital camera negative film. According to the invention, non-contact measurement of the two-phase flow field of the propeller is realized by using interference recording and diffraction reconstruction.

The invention discloses a cavitation effect enhancing device of an ultrasonic cleaning machine and a multi-material workpiece accurate descaling method.The cavitation effect enhancing device is installed on the ultrasonic cleaning machine and comprises an intelligent control mechanism, a water flow jetting mechanism, a monitoring mechanism, a circulating assembly and a sealing protection assembly; the intelligent control mechanism can receive and analyze monitoring signals transmitted by the monitoring mechanism in real time and output control instructions to adjust working parameters of the water flow jetting mechanism, the ultrasonic transducer and the circulation assembly. The water flow spraying mechanism is located in the cleaning tank and used for spraying water flow to impact the workpiece and disturb the cleaning liquid. The ultrasonic cleaning device has the beneficial effects that through injection and water flow disturbance of the water flow injection mechanism, removal of dissolved gas in cleaning liquid is promoted, the number of cavitation bubbles is increased, meanwhile, the intelligent control mechanism dynamically adjusts the power of the ultrasonic transducer, the power density is improved, the collapse energy of the cavitation bubbles is enhanced, and the cavitation effect strength is remarkably improved.

The invention discloses a non-contact conduction type weak ultrasound-assisted laser direct energy deposition device and method, and belongs to the technical field of additive manufacturing equipment. The invention discloses a non-contact conduction type weak ultrasound-assisted laser direct energy deposition device. The non-contact conduction type weak ultrasound-assisted laser direct energy deposition device comprises a powder feeding printing part, a printing platform and an ultrasonic vibration part. The printing end of the powder feeding printing part and a molten pool formed in the upper surface of the printing platform are oppositely arranged. The output end of the ultrasonic vibration part is arranged at a fixed distance from the molten pool; and the ultrasonic vibration part is fixedly connected with the powder feeding and printing part. According to the device disclosed by the invention, ultrasonic sound waves output by the ultrasonic vibration component in the printing process are attenuated from the emission head through air (protective gas) and enter a molten pool in a non-contact transmission mode, and negative effects such as over-strong cavitation bubbles are avoided while grain refinement and residual stress elimination are realized.

The invention provides an ultrasonic microcavity reactor which comprises a reactor main body and an ultrasonic wave generating device, and the reactor main body is installed in an ultrasonic wave radiating surface of the ultrasonic wave generating device; at least one micro-cavity unit is arranged in the reactor main body, the micro-cavity unit is of a hollow pipeline structure extending in the horizontal axial direction, and the inner diameter of a cavity of the micro-cavity unit sequentially comprises an axial divergent section with the cross section area continuously increasing from the inlet end of the axial divergent section to the outlet end of the axial divergent section in the fluid flowing direction; and the axial gradually-shrinking section is positioned at the downstream of the axial gradually-expanding section, and the cross sectional area of the axial gradually-shrinking section is continuously reduced from the inlet end of the axial gradually-shrinking section to the outlet end of the axial gradually-shrinking section. The micro-cavity unit is designed into a rotational flow cavity which is gradually expanded and gradually shrunk in the axial direction; therefore, a hurricane type cavitation bubble group can be formed in the reaction cavity of the ultrasonic microcavity reactor. Compared with a conventional ultrasonic cavitation reactor, hurricane type cavitation bubbles can be generated, the sound field distribution is concentrated, the shearing capacity is high, and the mixing and emulsifying effects are good.

The invention relates to an ultrasonic signal generation method for controlling cavitation bubbles. The ultrasonic signal generation method for controlling cavitation bubbles comprises the following steps: determining a transmission ratio of a first frequency ultrasonic signal to a second frequency ultrasonic signal; generating the first frequency ultrasonic signal towards a target area based on the sending proportion so as to enable cavitation bubbles to expand in the target area; and generating the second frequency ultrasonic signal towards the target area based on the sending proportion, so as to stop the expansion of the cavitation bubbles.

The present invention provides a method and apparatus for transferring at least one object from a donor substrate (30) to a target substrate (40), the donor substrate (30) having a thickness e z The carrier liquid forms a surface on which a film of the carrier liquid is deposited in the vertical direction Z, and the carrier liquid is transferred to the surface. x , D y , D z ), the transfer being ensured by local energy excitation of the liquid to form local cavitation bubbles at the object, D z / e z The method and the device are characterized in that the ratio is greater than 1, preferably greater than 1, preferably greater than 0.5.

The invention discloses a pump jet flow field testing device and a flow field missing compensation method. The pump jet flow field testing device comprises a high-frequency double-pulse laser, an image processing system, a camera synchronizer, a high-speed camera, a cavitation bubble water cylinder, a reflecting prism, a pump jet model and a transparent conduit. The high-frequency double-pulse laser is placed at the rear end of the pump spraying model in the cavitation bubble water cylinder, and laser emitted by the high-frequency double-pulse laser irradiates the pump spraying model through the cavitation bubble water cylinder; installing a reflecting prism and a high-speed camera on a laser plane of the pump spraying model; the data assimilation used by the image processing system and based on the generative adversarial network model effectively solve the problems of complex structure shielding, particle concentration loss and flow field information loss caused by wall reflection. According to the invention, the problem that related experimental devices for testing the internal flow field of the pump-jet propeller are not perfect enough is solved, the pump-jet missing flow field is effectively compensated, and the method is of great significance for the pump-jet propeller to know the form evolution law of the internal flow field from the experimental mechanism and to forecast the noise of the subsequent pump-jet propeller and calculate and verify the flow field.

The present invention discloses a method for strengthening cavitation and mixing in an ultrasonic microreactor, by introducing a mutual dissolving solution consisting of a gas-rich solution and a gas-poor solution into the ultrasonic microreactor; Meanwhile, a certain ultrasonic frequency and ultrasonic power are applied to the ultrasonic microreactor, and under ultrasonic action, these mutual dissolving solutions precipitate a large amount of gas nuclei and rapidly grow into cavitation bubbles, producing a violent cavitation effect, and the violent cavitation effect strengthens the mixing in the ultrasonic microreactor. Wherein, the nitrogen saturation solubility of the gas-rich solution is 1.3 45 times that of the gas-poor solution, and the volume flow rate of the gas-rich solution is 0.025 20 times that of the gas-poor solution. The present invention makes the average density of cavitation bubbles in a single microchannel in the ultrasonic microreactor be ≥1 / microliter, and a large amount of cavitation bubbles quickly stir the fluid like a stirrer, and the complete mixing time of the fluid is less than 100 milliseconds. The present invention solves the problem that cavitation is weak in the ultrasonic microreactor and cannot achieve millisecond mixing.

The utility model discloses a catamaran propelling device which comprises a catamaran body (1), a paddle propelling device (2), a deck (3), paddles (4), a gear (5), a chain (6), a roller (7), an inner chain plate (8), a sleeve (9), a pin shaft (10), an outer chain plate (11) with paddles and an outer chain plate (12) with paddles. The paddles are driven through rotation of the chain, and the catamaran is pushed to move through interaction of the paddles and water. Water flow between the two ship bodies can be adjusted and rectified, the flowing state of the water flow is changed, and resistance received by the catamaran is reduced. Due to the action characteristics of the paddles, cavitation bubbles can be reduced, the propulsion efficiency is improved, and the navigation stability and the operation performance of the ship are improved.

The invention discloses a cavitation shot peening surface strengthening method and system based on cooperation of high hydrostatic pressure and spherical focused ultrasound. The method comprises the following steps: establishing and maintaining a hydrostatic pressure environment higher than 0.1 MPa in a high-pressure processing cavity filled with a degassing liquid medium; the to-be-machined surface of the workpiece is positioned in a sound field focal region of the spherical focused ultrasound transducer; and in the high hydrostatic pressure environment, a transducer is driven to work so as to generate a cavitation bubble group in a space confinement range in a focal region of the transducer, and meanwhile, the workpiece is controlled to move according to a preset path, so that cavitation collapse impact acts on a target region on the surface of the workpiece. The device comprises a high-pressure processing cavity, a spherical focused ultrasonic transducer, a multi-degree-of-freedom movement mechanism and a control system. Through cooperation of high hydrostatic pressure constraint and the spherical focusing sound field, precise localization and energy strengthening of the cavitation effect are achieved, a plastic deformation layer can be efficiently and controllably introduced to the surface of a metal material, the surface hardness can be remarkably improved, a residual compressive stress layer is formed, surface layer grains are refined, and the method is suitable for precise surface strengthening of complex components.

According to the cleaning equipment and the control method thereof, a straight pipe or a common spray pipe on a water inlet pipeline of traditional cleaning equipment is replaced with a Laval spray pipe, and high-energy cavitation water flow generated by the Laval spray pipe is rich in a large number of micron-sized cavitation bubbles. The cavitation bubbles are instantly collapsed when impacting the surface of an object to be washed (such as a shoe), and extremely high local shock waves and micro-jet are generated. The strong physical force can effectively penetrate through fiber gaps, and stubborn stains (such as oil stains and mud stains) which are difficult to treat through traditional scrubbing or common water flow are thoroughly stripped and removed. The blots are exploded by increasing the energy per unit volume of the water flow (i.e., generating a cavitation effect). Therefore, the cleaning effect far better than that of the traditional technology can be achieved under the condition that less water is used. The environment-friendly policy of energy conservation and emission reduction is actively responded, and the long-term use cost is also reduced for users.

The invention discloses a numerical simulation method for researching the influence of ultrasonic parameters on the whole process of a cavitation effect, which comprises the following steps: constructing a two-dimensional model subjected to grid division in Fluent, the two-dimensional model being a model in which an ultrasonic transducer is immersed in water; adding a mixture model and a cavitation model based on a gas-liquid two-phase flow continuity equation into Fluent, and obtaining a simulation result of the influence of ultrasonic parameters on cavitation bubbles based on the mixture model and the cavitation model; and based on a Keller-Miksis equation, analyzing in Matlab to obtain a simulation result of the influence of the ultrasonic parameters on the growth and fracture of the cavitation bubbles. According to the numerical simulation method provided by the invention, the influence of the ultrasonic parameters on the whole process of the cavitation effect can be explained, the influence of the ultrasonic parameters from bubble nucleus generation to growth to collapse can be summarized relatively completely, and the relationship between the ultrasonic parameters and the cavitation effect can be known more clearly.

The invention provides an offshore photovoltaic cleaning robot based on a cavitation jet cleaning technology, and the robot comprises a vehicle body walking mechanism which is used for enabling the robot to walk autonomously on the surface of an offshore photovoltaic array; the cavitation jet cleaning device is used for generating cavitation jet by taking fresh water as a medium, stripping sea salt crystals, biological scales and water scales on the surface of the photovoltaic panel in a non-contact manner by utilizing cavitation bubble collapse energy, and recycling unused fresh water; and the computer vision device is used for collecting the surface image of the photovoltaic panel in real time, identifying the type and distribution of stains and dynamically adjusting the pressure and flow of the cavitation jet flow according to the types and distribution of the stains so as to realize on-demand cleaning. According to the invention, high-frequency micro-jet and shock wave effects generated by cavitation jet are utilized to realize high-efficiency non-contact removal of attachments (such as sea salt crystals, biological scales, water scales and the like) on the surface of the photovoltaic panel.

The embodiment of the invention provides a water ring vacuum pump blade cavitation impact energy evolution and cavitation prediction method. The method comprises the steps that a water ring vacuum pump blade cavitation bubble Rayleigh-Plesset equation and a water ring vacuum pump blade cavitation bubble dimensionless equation considering random pulsation and time-varying load pressure are constructed; solving the water ring vacuum pump blade cavitation bubble dimensionless equation to obtain the evolution process of the bubble radius along with the time change; constructing a water ring vacuum pump blade cavitation impact energy evolution equation to obtain a water ring vacuum pump blade cavitation impact energy evolution process; and a water ring vacuum pump blade cavitation impact cavitation area judgment equation is constructed under the time-varying working condition, the effective time-varying cavitation head of the blade and the cavitation area change range are obtained, and the maximum cavitation area occurrence time is predicted. According to the method, the cavitation impact energy evolution of the water ring vacuum pump under the random time-varying pulsation working condition is considered, and the blade cavitation damage and the space distribution characteristics of the cavitation area under the complex flow working condition can be effectively judged.

The application discloses a kind of based on wettability difference capillary ultrasonic microreactor and continuous efficient extraction method.The reactor includes sandwich type ultrasonic transducer and the capillary microreactor of segmented design along fluid flow direction: inner wall of front-end pipe section is coated with polytetrafluoroethylene, is hydrophobic, facilitate oil phase continuous and excite a large number of acoustic cavitation bubbles;Back-end pipe section is bare hydrophilic base material, guarantee efficient transmission of acoustic energy, enhance bubble vibration intensity.Through axial wettability gradient design, synergistic control cavitation bubble quantity and intensity, and induce liquid-liquid system to occur controllable phase state overturn in flow, significantly strengthen interface update and mass transfer.The system structure is compact, easy to operate, suitable for a variety of not mutually soluble liquid-liquid system, in 2-100 seconds can complete efficient extraction, compared with traditional microextraction method (2-60 minutes) efficiency is improved several times.

The invention relates to a mercury-containing acid mud efficient recovery method and device based on difference frequency resonance coupling. The high-efficiency mercury-containing acid mud recovery method based on difference frequency resonance coupling comprises the following steps: step 1, acid mud pretreatment: crushing, screening and drying mercury-containing acid mud; 2, coupled field leaching is conducted, specifically, a product in the step 1 is conveyed into a reaction kettle, stirring is conducted after an oxidizing agent is added, an acid mud turbid liquid is obtained, an oxidation-reduction reaction is conducted through catalysis of a difference frequency resonance coupled field formed by two frequency-adjustable ultrasonic waves, and the difference frequency adjusting range delta f is 6-10 kHz; step 3, carrying out solid-liquid separation; leaching liquid containing mercury and selenium is obtained. According to the scheme provided by the invention, the standing wave effect can be formed through the difference frequency, and the crushing efficiency of the cavitation bubbles is improved, so that the oxidation reaction speed of the mercury-containing acid mud turbid liquid is improved; secondly, through the adjustable frequency, the situation that the ultrasonic frequency is not matched with the mercury ion concentration and the turbid liquid temperature, and consequently ultrasonic energy waste is caused is avoided.

The present application belongs to the technical field of underwater operation special robots of marine engineering, especially to a kind of underwater cleaning robot for aquaculture net cage, to the problems of existing traditional cleaning equipment, such as easy to damage base material, poor water depth adaptability, nozzle easy to block and water surface equipment heavy, the following scheme is presented, it includes: underwater cleaning robot body, with frame type anti-collision integrated fuselage;Underwater cleaning system, inside underwater cleaning robot body, for cleaning net cage;Pressure detection unit, inside underwater cleaning system, for real-time detection of water depth data closed-loop regulation opening, then the impact pressure of cavitation bubble on the surface of the base material to be cleaned is controlled below 0.7MPa;Water surface take-up unit, connected to the underwater cleaning robot body;The present application designs a lightweight, modular, controllable and non-destructive underwater cleaning robot for aquaculture net cage.

The application discloses a wafer cleaning device and a cleaning method, and relates to the technical field of semiconductor manufacturing. The cleaning device comprises the following steps: S1. generating a continuous overflow of medium-temperature liquid water in a cleaning fluid flow channel; S2. generating a controllable cavitation bubble flow in the liquid water; S3. introducing an auxiliary bubble flow and stirring and mixing the cavitation bubble flow to form a mixed fluid containing double-mode bubbles; S4. converting the mixed fluid into a vertical laminar flow and guiding the wafer surface; S5. using different frequency ultrasonic waves generated by the collapse of the double-mode bubbles to perform fractional cleaning on the wafer surface contaminants; and S6. continuously discharging the contaminants through the overflow. According to the application, the cavitation bubble flow and the auxiliary bubble flow are generated in the cleaning fluid flow channel, the double-mode bubble flow is formed through stirring and mixing, the high-frequency ultrasonic waves and the low-frequency ultrasonic waves are synchronously released by the collapse of the double-mode bubbles to remove the nanoparticles and the microparticles, one step replaces the traditional multi-step cleaning, the risk of wafer transfer damage is eliminated, and the cleaning period is greatly shortened.