202 results about "Surface tension force" patented technology

Processes and systems for automating a conveyance operation using an elongated conveyance member. In some embodiments, the process can include modeling one or more system state profiles of a downhole tool string during the conveyance operation within a wellbore to define one or more profile models; calibrating the one or more profile models; using the one or more calibrated profile models to calculate at least one of a tension profile and a force profile along the elongated conveyance member based, at least in part, on one or more detectable system states and / or one or more undetectable system states; and using one of: (i) a surface tension uncertainty quantification model to calculate a surface tension and uncertainty bounds around the calculated surface tension; or (ii) a surface weight uncertainty quantification model to calculate a surface weight and uncertainty bounds around the calculated surface weight.

An electronically actuated droplet delivery device with a mouthpiece for inhaling fluid droplets includes an ejector mechanism having an electronic actuator operably coupled to an aperture plate. A fluid reservoir provided fluid to the ejector mechanism through a surface tension plate that increases contact between the fluid from the fluid reservoir and the aperture plate.

The invention provides a gas-liquid-solid multi-phase conveying centrifugal pump performance prediction method and an optimization design method. According to the method, the performance of the centrifugal pump is accurately predicted and the design efficiency of the centrifugal pump is improved through numerical simulation and optimization design in combination with a gas-liquid-solid three-phase flow dynamic model. Firstly, blade parameters are determined according to design requirements, a three-dimensional model is established, and grid division is carried out; then, the VOF-Level Set multiphase flow model, the particle model and the gas-liquid-solid coupling model are corrected, factors such as surface tension, particle immersion force and drag force are considered, and lift and efficiency curves are calculated through numerical simulation; and finally, a particle accumulation area is analyzed based on the particle distribution characteristic graph, and the optimal lift efficiency combination is obtained by adjusting parameters such as the inlet angle, the inlet width, the wrap angle and the blade number of the blades and optimizing design. According to the method, the performance of the centrifugal pump in the gas-liquid-solid multiphase flow environment can be improved, and a new design thought is provided.

The invention discloses a low-temperature fluid cavitation flow field cloud picture construction method and device considering interfacial tension. The method comprises the following steps: establishing a Venturi tube model and carrying out grid division; based on the thermodynamic effect in the low-temperature cavitation process, a cavitation model in Fluent simulation software is corrected; a surface tension coefficient of interphase acting force in a multiphase flow model in Fluent simulation software is changed to be customized by a user, a low-temperature medium surface tension function changing along with temperature is written into the Fluent simulation software in a UDF file form, a surface tension model of continuous surface force is opened, wall adhesion is checked, and a contact angle is added; importing the Venturi tube model subjected to grid division into Fluent simulation software for numerical simulation; and performing imaging processing on a result obtained by numerical simulation to obtain a cavitation flow field cloud picture. The rationality of the method is judged by comparing the cloud picture of the cavitation flow field with an experimental result.

A heating system is provided for an inhaler device, such as an e-cigarette or a personal vaporizer device, for generating an aerosol or a vapour from a liquid to be heated. The system comprises: at least one supply channel for conveying a liquid to be heated from a supply reservoir under capillary action or surface tension forces within the at least one channel; and heating means arranged at an outlet of the at least one supply channel and configured to heat the substance as it emerges from the outlet of the at least one channel. The heating means preferably comprises at least one heating element which extends across a width or an outlet opening of the supply channel and is typically confined to the outlet of the supply channel.

The invention provides an induction melting feeding ultrasonic atomization pulverizing system and method, and belongs to the technical field of metal powder material preparation. The induction melting system is used for melting metal raw materials, generated metal melt is sprayed out through a nozzle and drips on an ultrasonic vibration workbench, inert gas is ionized through a tungsten needle electrode tip in the plasma electric arc melting system, the dripped melt which is not atomized in time and cooled is assisted to continue to be heated, and the molten metal is melted. Under the action of ultrasonic atomization vibration, the melt liquid level is broken to generate a molten pool. And under the action of ultrasonic waves, molten liquid in the molten pool is broken to generate small fog drops, and the fog drops are rapidly cooled under the action of surface tension in the inert gas environment to form the metal spherical powder. Continuous operation of ultrasonic atomization powder preparation can be achieved, the conditions of hollow powder and satellite powder are reduced, and the prepared metal spherical powder has the advantages of being high in sphericity degree (larger than or equal to 0.95), high in compactness (larger than or equal to 99%) and narrow in particle size distribution (smaller than or equal to 60 micrometers).

The invention discloses a liquid drop collision dynamic behavior prediction method, which comprises the following steps of S1, analyzing a relationship between stress and deformation of an elastomer in a collision process of liquid drops, and establishing a dynamic model of a first liquid drop and a second liquid drop in the collision process; s2, solving the kinetic model according to the initial distance and the initial speed of the first liquid drop and the second liquid drop to obtain the speed of the first liquid drop and the second liquid drop and the sphere center distance in the collision process, and further calculating the interaction force of the first liquid drop and the second liquid drop in the collision process; s3, calculating the surface tension when the interaction force of the liquid drops in the collision process reaches the maximum value; and S4, determining the fusion condition of the liquid drops according to the surface tension when the interaction force of the liquid drops in the collision process reaches the maximum value. The method is simple in calculation and high in accuracy, fusion and splitting behaviors of the liquid drops can be predicted, and a calculation result is matched with experimental data.

The utility model relates to a water mist remote injection system based on magnetized water. On one hand, an axial flow fan drives air jet flow to be rectified through a rectifying section to form high-speed axial air jet flow; on the other hand, water is driven by a water pump to be introduced into a proportional mixer to be mixed with an additive, the mixed water is introduced into a magnetizing device, the hydrogen-bond interaction of water molecules is changed, and therefore the viscosity and surface tension of fog drops are improved, and finally the fog drops are sprayed out through a supersonic airflow atomization nozzle arranged on the mixing section of the air duct; under the boosting and protection effects of the high-speed axial air jet flow, the situations of diffusion, liquid drop coalescence and the like of mixed spray are not prone to occurring, remote spraying of effective media is achieved, and the particle size of the mist media at the remote target position is remarkably reduced.

The invention discloses an in-cylinder oil-gas mixing optimization method based on a liquid drop phase change state in a high-density environment, and belongs to the technical field of in-cylinder oil-gas mixing, and the specific process is as follows: step 1, selecting an alkane component of which the density monotonically changes in a gas-liquid interface in a binary mixture as a reference component; 2, calculating density distribution and influence parameters of reference components in the normal direction of the gas-liquid interface; step 3, according to the density distribution of the reference component in the normal direction of the gas-liquid interface, calculating to obtain the characteristic interface thickness and surface tension of the gas-liquid interface; 4, calculating an average molecular free path and a Knudsen number according to the interface temperature, the equilibrium pressure and the average molecular hard sphere diameter; 5, jointly predicting the evolution of a gas-liquid interface space structure through the interface thickness, the surface tension, the average molecular free path and the Knudsen number; and 6, when the predicted result in the step 5 is that supercritical phase change of the liquid drops occurs, the Reynolds number of airflow in the cylinder is increased, and oil-gas mixing in the cylinder is optimized.

The invention relates to an automatic detection device for the tensile resistance of a PE protective film in the field of detection equipment. Before the test, a uniform water flow sprayed from a water spray pipe forms a water film on the surface of a vertically released film body, and the surface tension of the water film is used to repair the wrinkles on the surface of the film body, thereby improving the surface flatness of the film body, and the gravity of the water film itself is used to improve the verticality of the film body, thereby improving the accuracy of subsequent tensile testing. In addition, after the static state is completed, the film body containing the water film is clamped by an upper clamping mechanism and a lower clamping mechanism, and then the water film is blown to remove the water film, thereby reducing the restoration of the wrinkles of the film body caused by dehydration. In addition, through the mutual cooperation of an upper clamping mechanism, an upper lifting mechanism, a lower clamping mechanism and a lower lifting mechanism, the waste film after the test is pulled, cleaned and re-loaded, thereby realizing automatic multiple tensile testing, facilitating multiple data comparisons and improving the accuracy of the test.

According to the pneumatic skin shape correcting device and method, a female die and a base of the shape correcting device have an interlocking function in a natural state, and the shape correcting device has the functions of providing ultrahigh pressure edge tonnage and releasing ignition sparks by means of magnetic force transmission under the condition that a coil is powered on; explosive is placed in the shape correcting device, a coil is electrified to magnetize the shape correcting device, magnetic force transmits magnetic induction to promote the magnetic induction switch to discharge and detonate the explosive, and high-temperature and ultrahigh-pressure gas is instantly generated to impact the inner surface of the semi-finished product; and after explosion, the coil is continuously electrified, the female die and the base are magnetized to generate ultrahigh pressure edge tonnage to seal explosion heat energy, and the high-pressure retention time is prolonged, so that inner surface layer materials of a semi-finished product are compacted through hot pressing, the grain ultrafine area is microscopically shrunk, and surface tension for counteracting springback is formed. The method has the remarkable advantages of high load, low energy consumption, high speed and the like, and can overcome the problem that the large pneumatic aluminum alloy skin is limited by a series of factors such as the solid solution inoculation period, the equipment table top and the tonnage and is poor in die attaching precision.

The invention discloses an oscillation microbubble chip, a separation system and an acoustic manipulation method, the device utilizes the acoustic eddy current effect induced by oscillation microbubbles to realize micro-nano particle acoustic manipulation, the chip structure and operation are simple, the biocompatibility is high, and by designing the chip structure, due to the breathable and water-repellent characteristics of PDMS and the surface tension of fluid, the micro-nano particle acoustic manipulation can be realized. Alternatively arranged equilateral triangle column cavities with different sizes are formed on the side wall of the PDMS microfluidic channel to anchor bubbles. Bubble oscillation is driven by bulk acoustic waves generated by exciting a piezoelectric transducer through a signal generator, symmetrical vortexes are formed on the surfaces of the bubbles through secondary acoustic radiation force generated by bubble oscillation, then large-size particles are captured, and small-size particles flow to an outlet along with flowing under the action of drag force. Gradient separation is adopted to separate small particles from a mixed solution and enrich large particles, enrichment, separation and other control of microparticles are achieved through the acoustic vortex field effect of a specific structure, great potential is achieved in biological research, the structure is simple, the equipment cost is low, and integration is easy.

The invention relates to the field of aerospace attitude and orbit control power systems, in the field, an attitude and orbit control power system mostly adopts a double-component constant-pressure extrusion type propelling system which is generally in a structural form that four storage tanks are flatly laid, two of the storage tanks are filled with an oxidizing agent, and the other two storage tanks are filled with fuel. A surface tension storage tank is usually selected as a propulsion system storage tank, and the balanced emission index requirement superior to 3% is provided for two parallel working storage tanks with the same component. And the flow resistance deviation of the pipeline has great influence on balanced discharge. The invention discloses a method and a system for analyzing influence of pipeline flow resistance deviation on balanced discharge of a storage tank. Through the method, the flow deviation of the two storage tanks caused by the flow resistance deviation from the liquid path outlets of the two surface tension storage tanks with the same component to the pipeline junction can be estimated theoretically, so that the percentage value of the unbalanced discharge amount can be calculated. A referential method is provided for analysis and control of the unbalanced discharge amount of two storage tanks of the same component of an attitude and orbit control power system in the deep space field.

The invention relates to the technical field of food detection, and discloses a food heavy metal detector and a use method thereof.The food heavy metal detector comprises a rack, a detection unit is installed on the rack, a test tube rack is rotationally connected to the interior of the rack, a plurality of detection tubes are installed in the test tube rack, and a composite discharging assembly is arranged in the rack; the composite discharging assembly comprises two micromotors which are symmetrically installed on the outer surface of the rack, the test tube rack rotates, the test tube rack rotates and vibrates at the same time through a telescopic rod under the action of a balancing weight, so that the discharging purpose is achieved, through the synergistic effect of rotation and vibration, the discharging efficiency is improved, and the working efficiency is improved. The liquid in the detection tube can be more effectively discharged, the liquid can be gathered towards the bottom of the detection tube by rotation under the action of centrifugal force, the surface tension of the liquid and the possible local attachment state can be further broken by vibration, the liquid can flow out more smoothly, and the discharging efficiency and thoroughness are improved.

The invention provides a method for determining the pore diameter lower limit and the effective pore volume ratio of movable fluid. The method comprises the steps that the temperature of each sample under the stratum in-situ condition is calculated according to the ground temperature gradient and the burial depth; correcting the surface tension coefficient of the water by using the calculated temperature; determining an average contact angle of water and shale; calculating capillary force, enabling the capillary force to be equal to reservoir fluid pressure, and calculating the lower limit of the aperture of the movable water; carrying out carbon dioxide adsorption, liquid nitrogen adsorption and mercury injection experiments on the sample to obtain connectivity pore volume-pore size distribution, and calculating effective pore volume in combination with a movable water pore size lower limit; carrying out a low-field nuclear magnetic resonance experiment, calculating the total pore volume of macropores, obtaining the total pore volume of small pores in combination with a carbon dioxide experiment, and finally calculating the total pore volume; and calculating the pore volume ratio of the effective pores by using the pore volume of the effective pores and the total pore volume. According to the method, the evaluation precision of the lower limit of the pore diameter of the shale reservoir movable fluid and the pore volume ratio of the effective pores is effectively improved, and the test cost is reduced.

The utility model relates to the technical field of pipeline groove grinding, in particular to a pipeline groove grinding integrated device which comprises a placing table and a moving table, two inserting grooves are formed in one end of the placing table, connecting blocks are installed and inserted into the two inserting grooves, the connecting blocks are fixedly connected to one end of the moving table, and the moving table is fixedly connected with the placing table. A dust cover is fixedly connected to the top end of the movable table, a booster water pump is fixedly installed at the top end of the dust cover, the output end of the booster water pump is fixedly connected with the top end of a spraying head and internally communicated with the top end of the spraying head, a water inlet is formed in one side of the booster water pump, and the spraying head is arranged at the inner top of the dust cover. And a plurality of universal wheels are arranged at the bottom end of the moving table. According to the device, the booster water pump drives the atomizing spray head to form water mist, dust particles generated by grinding are wetted, the dust particles are bonded into large particles through surface tension of water, sedimentation is accelerated, and dust diffusion is effectively restrained.

The invention relates to the technical field of storage, in particular to a urea solution storage device and a urea solution storage method.The urea solution storage device comprises a tank body, the tank body is composed of a cylindrical barrel and a conical bottom, a liquid discharging pipe is arranged at the lowest point of the conical bottom, and the urea solution storage device further comprises a stirring mechanism and a liquid discharging mechanism, an upper discharging mechanism is coaxially arranged in the hollow pipe; and an aeration mechanism. A high-concentration area and a low-concentration area in the tank body can be mixed to form radial diffusion, so that urea molecules are uniformly dispersed, local concentration supersaturation is avoided, and the device can be regularly started and used in the storage tank; in the synchronous stirring process, the liquid is sucked from the bottom of the hollow pipe and diffused to the periphery from the top of the hollow pipe, so that an axial circulating flow field is formed, and no stirring dead zone exists in the tank body; the aeration mechanism is arranged, released bubbles can generate disturbance in the rising process, the surface tension of the solution is destroyed, the shearing force generated when the bubbles are broken can disperse tiny crystal particles, and the crystal particles are prevented from being agglomerated.

The invention relates to the field of electrolyzed water oxygen evolution reaction, and particularly discloses a preparation method of an oxygen evolution electrode for promoting bubble removal through cooperation of double Laplacian forces. A microscopic nanocone catalyst layer structure is grown on foamed nickel in an electro-deposition mode, a discontinuous three-phase interface is formed by means of the morphology to reduce bubble adhesive force, and under the simultaneous action of Laplace force generated by a microscopic V-shaped structure, microbubbles are promoted to be desorbed from the surface of a catalyst layer and leave a reaction area. A macroscopic gradient hole array is constructed on foamed nickel, and hydrophobic coatings are coated in holes, so that a hydrophobic and aerophilic effect is presented in the holes, gas in a reaction area is induced to gather towards a hydrophobic and aerophilic hole area under the action of surface tension, and the Laplace force generated by a gradient hole macroscopic V-shaped structure is utilized to promote rapid and directional transmission and removal of bubbles.

The invention relates to the technical field of processing and conveying equipment, in particular to a functional conveying device for carton gluing processing, which comprises a conveying workbench, a limiting frame fixed at the top end of the conveying workbench and a conveying assembly fixed in the limiting frame. When the conveying device is used, gluing position roughening operation can be carried out before gluing of the inner wall of a paper box, the gluing effect can be remarkably improved, the contact area is increased, the adhesive force and the bonding strength are improved, meanwhile, the surface energy is reduced, and the service life of the paper box is prolonged by increasing the surface roughness of the inner wall of the paper box, forming a microscopic concave-convex structure and generating mechanical interlocking after glue solidification. The surface tension influence is reduced, the glue solution is uniformly spread, various glue types are adapted, the stress is dispersed when the glue solution is stressed, the structural stability is enhanced, the environment resistance is improved, meanwhile, the roughly-ground inner wall is coated with glue, the contact area can be increased, the adhesion stability is improved, and drooping caused by glue accumulation is avoided.

The present invention discloses a solid-liquid coupling simulation method with surface tension effect based on the material point method, belonging to the fields of computer graphics and physics-based simulation. The system used in the simulation method includes solid model modeling, fluid model modeling, Level Set implicit surface construction, Marching Cubes display surface construction, surface particle resampling, and collision detection. The system simulates fluids and solids on the basis of the material point method, constructs Level Set to resample fluid surface particles, and adds surface tension to the fluid using the CSF model. Different background grids are used to simulate fluids and solids respectively to solve the inherent adhesion phenomenon during MPM solid-liquid coupling and achieve the slip contact effect during solid-liquid coupling. Finally, the coupling phenomenon of incompressible fluid with surface tension effect and nonlinear elastic solid is realized.

The present application discloses a cleaning device and an electroplating device. The cleaning device is configured to clean an electroplating chuck, and comprises a tank body and a pipe assembly; the tank body comprises an inner tank and an outer tank, the inner tank is configured to contain a cleaning liquid, and the outer tank is provided at the periphery of the inner tank and is configured to collect the cleaning liquid overflowing from the inner tank; the pipe assembly comprises a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is connected to the inner tank and is configured to supply the cleaning liquid to the inner tank, and the liquid outlet pipe is connected to the outer tank and is configured to discharge the cleaning liquid from the outer tank. The electroplating chuck has a first portion to be cleaned, and said first portion is located at the bottom of the electroplating chuck. When the electroplating chuck is cleaned, said first portion is located at the opening of the inner tank, so that the cleaning liquid overflowing from the inner tank cleans said first portion under the action of surface tension. By means of the surface tension of the cleaning liquid overflowing from the inner tank, the electroplating chuck is cleaned efficiently, and splashing and dripping of the cleaning liquid into an electroplating chamber of the electroplating device are effectively reduced or even avoided.

A fluid associated with a desired chemical or electrochemical reaction continuously flows or cyclically pulsates across the reactive surface at a flow rate or frequency consistent with the average time required for a desired proportion of bubbles to grow to a particular diameter as part of the reaction. The fluid flow rate used is sufficient to disrupt the capillary force of the bubbles on the reactive surface at the specific diameter. If pulsatile, the fluid does not flow or is at a sufficiently low flow rate to allow sufficient reaction kinetics during a period of time between periodic fluid flow or pulsations. Bending the reactive surface and the fluid flow channel may also reduce the surface tension of the bubbles, reduce the fluid flow force required to remove the bubbles at an optimal size, thereby reducing the energy demand for pumping the fluid.

The invention belongs to the technical field of demisting, and particularly relates to an integrated baffling demister which comprises two supporting frames, a corrugated plate is fixedly connected between the two supporting frames, a deflecting sheet is fixedly connected to the side wall of the corrugated plate, the corrugated plate and the deflecting sheet are used for trapping entrainment in gas, and the corrugated plate is of a multi-deflecting structure; according to the demister, the opportunity that entrainment is captured is increased by utilizing the multi-fold structure of the corrugated plate, when gas containing the entrainment flows through the demister at a certain speed, due to the inertial impact effect of the gas, the entrainment collides with the corrugated plate, and gathered liquid drops are large until the gravity generated by the liquid drops exceeds the resultant force of the rising force of the gas and the surface tension of liquid, so that the entrainment is captured. The liquid drops are separated from the surfaces of the corrugated plates, and a plurality of integrated baffling demisters provided by the invention can be welded and combined into various shapes according to requirements.

The utility model relates to the technical field of storage tank product testing equipment, in particular to a surface tension storage tank overturning testing device, which is characterized in that the upper end of a first supporting seat is in shaft connection with a supporting table, the upper wall of the supporting table is fixedly connected with a bearing inclined plate, the upper wall of the supporting table is movably provided with a clamping plate main body, and the lower end of the clamping plate main body is fixedly connected with a sliding block main body; the sliding block body is slidably connected with the inner wall of the open groove in the upper end of the supporting table, the inner wall of the sliding block body is in threaded connection with a threaded rod, one end of the threaded rod is fixedly connected with a motor, and one end of the second supporting base is fixedly connected with a control motor. The fixing effect is guaranteed, and the problem that the accuracy of test data is affected due to the fact that an existing overturning test device is difficult to match with various surface tension storage tanks of different models and is prone to shaking or shifting in the overturning process is solved.

This invention relates to a method for calculating the restoring force caused by the surface tension of liquid fuel in a storage tank: A ground-based scaled-down storage tank control group is constructed, comprising three sets of scaled-down storage tanks, with each set consisting of two tanks filled with different test solutions; a ground swaying test is conducted on the ground-based scaled-down storage tank control group, and the first-order swaying fundamental frequency is recorded; the first-order resonance process of each ground-based scaled-down storage tank in the ground swaying test is equivalent to that of a simple pendulum model; and the gravitational acceleration g between the control groups formed by the same scaled-down storage tank radius and different test solutions is calculated. mn Based on the proportional relationship between the internal liquid surface tension and the equivalent acceleration generated by the internal liquid surface tension, the equivalent acceleration generated by the internal liquid surface tension of the scaled-down tanks in various locations is calculated. According to the principle that the liquid-filled tank of the spacecraft is proportional to the Bond number of the on-orbit environment, the equivalent acceleration generated by the internal liquid surface tension under the actual on-orbit operating conditions is extrapolated, and then converted into the restoring force caused by the surface tension of the liquid fuel inside the tank.

The invention discloses a wafer drying device. The wafer drying device comprises a base and at least two top knives, the top of each top cutter is provided with a plurality of top cutter grooves used for placing wafers. The bottom of each top cutter is arranged on the base in parallel, so that the plurality of top cutter grooves of the adjacent top cutters are distributed in a one-to-one correspondence manner; the projections of the notches of the top cutter grooves aligned with the adjacent top cutters in the parallel arrangement direction are at least partially overlapped, and the projections of the bottoms of the top cutter grooves aligned with the same position in the parallel arrangement direction are at least partially staggered, so that a certain included angle is formed between the wafer placed in the top cutter grooves and the vertical plane. According to the technical scheme, through staggered arrangement of the groove openings and the groove bottoms of the adjacent top cutter grooves, the wafers incline backwards or forwards, mutual adsorption or shaking of the wafers due to surface tension of water is avoided, and the watermark problem in the wafer drying process is reduced. The invention further discloses a wafer drying method using the wafer drying device.

The provided method includes: determining an energy parameter and a co-volume parameter of a pure gas by a PR state equation, and determining a material parameter and a co-volume parameter of a mixed gas by a Waals one-fluid mixing rule and a combination rule; determining a Helmholtz free energy density and an equilibrium density of the pure gas by a Wertheim molecular association theory, and determining Helmholtz free energy and an equilibrium density of a (H2+N2) mixed gas with different components by a density mixing rule; determining an influence parameter of the pure gas by a gradient theory (GT), and determining an influence parameter of the mixed gas by the influence parameter of the pure gas and an interaction coefficient; simplifying a GT model; and obtaining the surface tension of the (H2+N2) / H2O system at different temperatures by combining the LGT model and the PR state equation.

The invention provides a management device for small plate type storage PMD, and particularly belongs to the technical field of gas-liquid separation. A large blade assembly and a small blade assembly both adopt vertical blades, the blades adopt a plug-in type mounting structure, the principle that surface tension drives liquid under microgravity is utilized, a plate type liquid management technology is adopted, and the surface tension of the liquid is utilized to complete transmission and storage of the liquid, and the blades are designed into middle hollow structures and small blades. The structure weight is reduced, the liquid storage function under microgravity is achieved through the combination of the two parts, and therefore liquid drainage without gas filling is achieved, shaking of liquid can be restrained, the overall structure is optimized, the weight is reduced, the structure is simple, and reliability is high. The device comprises a large blade assembly and a small blade assembly, and further comprises a blade positioning shaft and a liquid collector assembly, the large blade assembly is composed of a first large blade and a second large blade, and the small blade assembly is composed of a first small blade, a second small blade, a third small blade and a fourth small blade.

The invention relates to the technical field of college physics experiment devices, and discloses a liquid viscosity coefficient and surface tension coefficient measurement comprehensive experiment instrument, which comprises a test bed, a first square column container, a second square column container, a timing automatic release device, a force sensor, a metal circular ring, an industrial camera matched with a telecentric lens, a lifting platform and a host. According to the invention, two original experimental devices are combined into one, so that the cost is saved, and the laboratory space is also saved; by designing the timed automatic release device, manpower is saved, and errors caused by manual operation of an original experimental instrument can be reduced; and the instantaneous speed of the small ball on the falling path is measured by using a machine vision technology, so that the selection basis for selecting the constant-speed motion interval of the small ball can be explored.

The invention discloses a surface tension coordinated regulation and control high-strength dense net underwater explosion jet flow suppression protection device and a use method. A selective permeable barrier is constructed through a high-strength dense net, surface tension of an interface is used for cooperatively and selectively permeating a water phase, blocking a gas phase from passing, breaking symmetrical expansion of bubbles and inducing energy to be dissipated in a capillary wave form, and the surface tension and multi-layer array configuration are adjusted by combining real-time adjustment of mesh tension and a dense net structure; the formation of high-speed jet flow is inhibited; and collapse energy is dispersed. The limitation that traditional protection only weakens shock waves is broken through, double inhibition of bubble pulsation and jet flow can be achieved, and the device has the advantages of light weight and modular deployment and has important popularization value in military and engineering scenes such as submarines and underwater facilities.