107 results about "Surface tension force" patented technology

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 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 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 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.

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.

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 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 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.

To provide a method and a device for estimating floating droplet surface tension, which enable accurate estimation of surface tension of a floating droplet using the flotation technique even when the floating droplet is not truly spherical due to an external force required for flotation.SOLUTION: A floating droplet surface tension estimation method for estimating surface tension of a floating droplet is provided, the method involving correcting surface tension derived on the basis of a vibration frequency of the floating droplet using a correction equation including variables based on an external force applied to the floating droplet.SELECTED DRAWING: Figure 1

The invention provides a method for rapidly predicting the surface tension of a foam extinguishing agent on site, which comprises the following steps: S1, collecting the surface tension of different types of foam extinguishing agents under different temperature conditions; s2, taking the first surface tension and the temperature measured by the thermocouple as input data, and taking the second surface tension as output data; s3, establishing a machine learning model; s4, after the model parameters are initialized, establishing a mapping relation between the input data and the output data; s5, the first surface tension and the temperature are collected again to serve as input data, and the machine learning model is adopted to predict data of the second surface tension. According to the method, the maximum bubble pressure method is improved based on high-speed camera shooting and image recognition, temperature compensation and a machine learning model are combined to predict the surface tension of the foam extinguishing agent on the fire extinguishing and rescue site, and the requirements that on-site surface tension measurement operation is convenient, the device structure is simple, and the surface tension measurement result is high in accuracy can be met.

The invention discloses an absolute measurement method and device for the density of molten salt and solution, and belongs to the field of molten salt physical property tests.The measurement method comprises the steps that 1, a cone and cylinder composite heavy hammer is adopted to measure the density of the molten salt or solution; 2) arranging two measuring positions on the cylinder section of the heavy punch, taking the section between the two measuring positions as a middle measuring section, the length of the middle measuring section is equal to the distance between the two measuring positions, the diameter of the middle measuring section is equal to the diameter of the cylinder of the heavy punch, and measuring at the two positions in sequence; (3) the density of the fused salt or the solution is determined by the volume of the middle measuring section of the heavy hammer and the buoyancy borne by the middle measuring section, so that the density of the fused salt and the solution is deduced; according to the method, a long-distance microscope system is adopted to directly measure the thermal expansion of the heavy hammer at high temperature, calibration by a standard substance is not needed any more, when the method is adopted to measure the density of the fused salt and the solution, the volume of the heavy hammer does not need to be calibrated, additional force caused by surface tension is completely removed, the measurement process is greatly simplified, and the measurement precision is improved.

The utility model discloses a de-foaming device for adhesive production, which comprises a de-foaming mechanism, the de-foaming mechanism comprises a shell, a motor is fixedly connected to a middle shaft of the top of the shell, the output end of the motor is fixedly connected with a stirring roller, and the top of the surface of the stirring roller is fixedly connected with a driving gear. According to the defoaming device for adhesive production, the defoaming mechanism is arranged, gas in an inner cavity of a shell is pumped out through a first one-way valve and an exhaust pipe in the process that a sealing disc moves towards the left side, gas in an inner cavity of a connecting cylinder is exhausted in the process that the sealing disc moves towards the right side, and the inner cavity of the shell is vacuumized through reciprocating work; the pressure of the inner cavity of the shell can be reduced, bubbles in the adhesive are expanded and escaped in a low-pressure environment, when the pressure is reduced, the solubility of dissolved gas in liquid is also reduced, the bubbles move from the interior of the adhesive to the surface, and the bubbles are broken under the action of surface tension, so that the aim of defoaming is fulfilled.

The present application relates to the technical field of atomization numerical simulation, and relates to an atomizer atomization numerical simulation method and system based on temperature variation characteristics, which comprises the following steps: confirming a test atomizer set and an ambient temperature set, obtaining a plurality of normal liquid viscosity sets and a plurality of normal liquid droplet surface tension sets, obtaining an optimized temperature interval, constructing a viscosity surface tension momentum equation, setting a solver parameter, sequentially extracting an optimized temperature value from the optimized temperature interval, simulating a pre-constructed simulation atomizer according to the solver parameter, the optimized temperature value and the viscosity surface tension momentum equation, obtaining a simulation atomization parameter, otherwise, taking the simulation atomization parameter as an optimized atomization parameter, summarizing the optimized atomization parameters, obtaining an optimized atomization parameter set, obtaining an optimal atomization parameter, and completing the atomizer atomization numerical simulation based on the temperature variation characteristics based on the optimal atomization parameter. The present application can improve the performance and atomization effect of the atomizer.

The utility model relates to technical field of compressor production, specifically relates to a device for welding of compressor upper and lower cover circumference, it includes frame, deflection device, clamping device, welding torch, welding torch moving device, welding torch cleaning device, clamping device is located on deflection device, welding torch sets up on welding torch moving device deflection device, welding torch cleaning device, welding torch moving device all set up on the frame, the utility model passes through using the single welding torch of immovable position, utilizes the mode of workpiece rotation and carries out welding, can weld the high -quality weld. And the workpiece is placed in the inclination, in the welding process, the welding fluid will flow along the junction of upper and lower cover circumference and fill it due to the action of gravity and the action of liquid surface tension, will make the weld internal density uniform after welding, and the weld is not easy to collapse due to uneven stress. Through setting up the welding torch cleaning mechanism, the welding torch is cleaned and lubricated after working for a period of time can prolong the service life of the welding torch and improve production efficiency.

The application provides a liquid accumulator integrated with a surface tension storage tank shell, which comprises a lower shell, a supplement port, a liquid outlet port, a screen assembly and a middle separation assembly, the supplement port and the liquid outlet port are connected with the bottom of the lower shell respectively, the middle separation assembly is fixedly arranged on the inner wall of the lower shell, one end of the screen assembly is connected with the middle separation assembly, and the other end of the screen assembly is communicated with the liquid outlet port; the middle separation assembly comprises a separation plate, a gas guide pipe and a flow guide assembly, a circular hole is arranged in the center of the separation plate, the separation plate is fixed on the inner wall of the circumferential side of the lower shell, the flow guide assembly is arranged on the separation plate, one end of the gas guide pipe is arranged in the angle area between the separation plate and the lower shell, the other end of the gas guide pipe passes out from the circular hole, and the height of the passing-out end is flush with the highest part of the separation plate. The liquid on the upper and lower sides of the separation plate can freely move through the central circular hole, compared with the traditional closed accumulator structure, the great impact load caused by the incompressibility of the liquid to the structure is reduced, and the mechanical performance of the accumulator is enhanced.

The present application relates to the technical field of micro liquid flow standard device, more particularly, it is especially related to a liquid surface tracking type liquid mass weighing method and device.The present application comprises: S1, using a spectral confocal sensor to monitor the liquid level in the weighing container in real time; S2, driving the liquid inlet pipe by a motor control module, so that the lower end of the liquid inlet pipe keeps a constant relative position with the liquid level; S3, continuously recording the liquid mass by a weighing device; S4, using the constant relative position to regard the surface tension as a system constant, and deducting the weighing initial value to eliminate the influence of the surface tension on the dynamic weighing uncertainty.The present application can keep the distance between the liquid surface and the liquid injection pipe constant, and the error is controlled within 0.5mm, so that the surface tension becomes a stable system error and is eliminated, and the influence of the surface tension on the micro liquid mass weighing uncertainty is eliminated.

This invention discloses a supercritical gas injection simulation method for deep-earth energy storage projects. This method constructs a computational framework for supercritical gas-salt two-phase flow based on the lattice Boltzmann method, utilizes the Shan-Chen two-component model to characterize the interaction between supercritical gas and water, and introduces a continuous surface force model equation to controllably couple interfacial tension, thereby achieving numerical simulation of supercritical gas injection under high density ratio and high surface tension conditions. Through an improved force term discretization scheme and independent adjustment of the surface tension term, high-precision recovery of force balance at the interface is achieved, significantly improving simulation stability and physical consistency. This invention fills the gap in the lattice Boltzmann method for simulating the displacement, migration, and storage behavior of various supercritical gases in porous aquifers or fractured grids, and can provide technical support for the design, operation, and safety assessment of deep-earth energy storage projects.

The invention discloses a liquid surface tension measuring system and method, and relates to the technical field of liquid physical property measurement. The system comprises a lifting measurement module, a heating temperature control module and a signal acquisition and processing module, the lifting measurement module is used for measuring the surface tension of liquid to be measured, and the heating temperature control module is used for controlling the measurement temperature of the liquid to be measured. The signal collecting and processing module is used for collecting the lifting height of the lifting measuring module, the surface tension of the liquid to be measured and the temperature of the heating temperature control module in real time and controlling the lifting height of the lifting measuring module and the temperature of the heating temperature control module in real time. The device effectively overcomes the problems of poor temperature adaptability, limited lifting stroke, low automation control degree and the like in the prior art, has the characteristics of simple structure, convenience in operation, wide measurement range and high experiment repeatability, and is suitable for accurately measuring the surface tension of liquid in scientific research and industrial production.

An embodiment of the present disclosure provides a method for cleaning a substrate, the method comprising: exposing the substrate to a cleaning agent to remove impurities located on the surface of the substrate; exposing the substrate to a liquid desiccant chemical to remove the cleaning agent located on the surface of the substrate; solidifying the liquid desiccant chemical remaining on the surface of the substrate to obtain a solid desiccant chemical; and sublimating and removing the solid desiccant chemical. By solidifying the liquid desiccant chemical and then removing it by sublimation, the solidified desiccant chemical can eliminate the gas / liquid interface, making the surface tension close to zero, eliminating capillary force during the subsequent sublimation removal process, reducing the damage to the substrate structure caused by the capillary force, and achieving a non-destructive cleaning effect. At the same time, since the influence of the capillary force is eliminated, the residue of cleaning agent and impurities on the substrate surface can be greatly reduced.

The application discloses a valve body laser cutting device and method, which comprises the following steps: low-duty-ratio pulse scanning is performed on the outer wall of the valve body to generate a guide groove with surface tension gradient and corrugated texture; inner and outer double-layer pulse air flows are sprayed according to the characteristics of the guide groove, and periodic negative pressure cavities and positive pressure barriers on both sides are formed at the groove bottom; spiral trajectory continuous laser cutting is performed under the action of the double-layer air flows, transverse ultrasonic waves in a three-to-four resonance relationship with the inner layer pulse air flow are applied, and a standing wave guide flow is established on the surface of the molten pool to obtain a cutting seam penetrating through the wall thickness; when the cutting seam is penetrated, the air flow is switched to negative pressure suction and the ultrasonic wave is changed to a traveling wave to remove residual molten droplets; low-power rapid scanning is performed on the inner wall of the cutting seam by using the residual heat of the valve body, and pulsed inert gas flow is injected to make laminar flow and micro-turbulent flow alternately peel off the residual film. The scheme can inhibit slag backflow without increasing additional cooling or chemical treatment.

The invention relates to a concentric common bottom plate type surface tension storage tank which comprises an oxidizing agent gas port, a combustion agent gas port, a concentric shell, a combustion agent guide plate, an oxidizing agent outer shell, an oxidizing agent guide plate, an oxidizing agent liquid storage device, a combustion agent liquid port, an oxidizing agent liquid port, an oxidizing agent liquid storage device, a mounting flange, an inner supporting flange, an outer supporting flange and a cylindrical support. According to the concentric common-bottom-plate type storage tank, the interior of the storage tank is divided into the two cabins through the shell, the space of a double-storage-tank structure is saved, meanwhile, the size and height of the whole storage tank are reduced, and weight reduction and attitude control of the whole satellite structure are facilitated. And meanwhile, the mass center change caused by propellants with different filling ratios can be reduced to the maximum extent, the shaking height of the propellants in the satellite attitude and orbit control process can be effectively reduced, and the shaking torque and the shaking force are reduced.

The application discloses a multiphase flow interaction simulation method based on MPM and a phase field model, and comprises the following steps: step S1, storing mass parameters, phase field parameters and momentum parameters of Lagrange particles in an Euler grid; step S2, updating the phase field of the Euler grid according to the chemical potential to control the energy of the whole system; step S3, updating the momentum of the Euler grid according to gravity, elastic force and the surface tension of the updated equivalent phase field form; step S4, after the grid momentum is updated, processing the boundary on the Euler grid by using a slip boundary condition; step S5, after the phase field and the momentum are updated, converting the momentum parameters and the phase field parameters from the Euler grid variables to Lagrange variables; and step S6, updating the state of the Lagrange particles: updating the position and mass state of the Lagrange particles according to the information returned to the Lagrange particles.

The invention belongs to the technical field of communication, and provides a microcomputer electroacoustic emission sensor and a preparation method thereof.The microcomputer electroacoustic emission sensor comprises a substrate device and a cantilever device partially attached to the substrate device, and a gas cavity is formed in the attached position and the non-attached position; a through hole is etched in the cantilever device, and the cantilever device and the substrate device penetrate through the gas cavity through a through hole gap to form a liquid-gas cantilever bridge structure based on surface tension; and the space of one side, close to the through hole, of the gas cavity is gradually increased. By utilizing the surface tension of a liquid medium, a gas cavity is formed below the cantilever structure, a liquid-cantilever-gas structure is formed, and liquid cannot enter the cavity structure under the action of the surface tension by controlling the width of a gap between the piezoelectric cantilever structure and the surrounding wall structure; direct detection of acoustic emission signals propagated in liquid in the storage tank is realized, and the sensitivity of the sensor is improved.

The embodiment of the invention provides a surface tension testing method for detecting glue with non-flowability. The testing method comprises the following steps: preparing a base material, wherein a groove is formed in the surface of the base material; filling to-be-tested glue into the groove, and ensuring that the surface of the to-be-tested glue is flush with the opening of the groove; a liquid injection device is provided, distilled water is contained in the liquid injection device, and the liquid dropping speed range of the liquid injection device is set to be 0.2 microliter to 0.5 microliter per second; distilled water is dropwise added to at least three different positions on the surface of the glue through the liquid injection device, so that at least three liquid drops are formed; the contact angle of each liquid drop is calculated, and the contact angles of at least three target liquid drops are obtained; and determining the surface tension of the non-flowable glue to be measured according to the calculated contact angle of each target liquid drop.

The invention relates to the technical field of multiphase flow mass transfer simulation, and provides a fluctuating pipeline oil-gas two-phase flow transient determination method and device considering multiple flow patterns. The corresponding method comprises the following steps: generating respective momentum equations of the oil phase and the gas phase in the fluctuating pipeline according to respective phase density, volume phase volume fraction, phase velocity, mass exchange rate, acting force between the oil phase and the gas phase and interface relative pressure of the oil phase and the gas phase; according to the respective phase density, the phase velocity and the friction factor of the oil phase and the gas phase, determining the relationship between the inter-phase pressure difference generated by the surface tension in the fluctuating pipeline and the relationship between the stable slug flow and the respective phase friction force of the oil phase and the gas phase; determining a flow pattern type according to the hydraulic parameters of the fluctuating pipeline; and determining the oil-gas two-phase flow transient state of the fluctuating pipeline according to the momentum equation, the inter-phase pressure difference, the relationship and the flow pattern type. According to the oil-gas two-phase flow transient state determined by the method, the dynamic change of the flow process can be better reflected, and the time-varying characteristic and spatial distribution of the oil-gas two-phase flow transient state can be more accurately represented.

The invention discloses a micro rotor and a method for detecting liquid low surface tension based on the rotating speed of the micro rotor, and belongs to the technical field of liquid surface tension testing devices.The micro rotor comprises a rotating center, at least two rotating arms in the same direction are machined on the rotating center, and arc-shaped hydrophilic grooves communicated with the rotating center are machined in the rotating arms; the tail end of the arc-shaped hydrophilic groove is communicated with the outside; the width of the arc-shaped hydrophilic groove is gradually reduced in the direction from the rotating center to the tail end of the rotating arm. According to the method, the low-surface-tension liquid is dropwise added to the rotation center of the micro rotor, the actual motion state of the micro rotor is analyzed by using Tracker software, and the test rotation speed result of the micro rotor represents the tension of different low-surface-tension liquids, so that the low-surface-tension liquid soluble in a water substrate is rapidly detected. The micro rotor has good reusability, the preparation method is high in applicability, and the micro rotor can be widely applied to the fields of biomedical treatment, chemical engineering, environment detection and the like.