15 results about "Surface tension coefficient" patented technology

The present invention discloses an independent injection control method and injection device for an arrayed electrohydrodynamic nozzle, belonging to the technical field of inkjet printing. The injection device includes an electrohydrodynamic nozzle, a high-voltage power supply, a laser module, and a control module. The electrohydrodynamic nozzle is composed of an ink cartridge, a nozzle plate, and a nozzle. The high-voltage power supply is used to provide high voltage electricity to form an electric field driving force to eject the solution. The laser module generates laser for regulating the temperature of the liquid meniscus of the solution. The control module controls the opening and closing of the high-voltage power supply and the laser. The present invention regulates the temperature of the liquid meniscus at the tip of the nozzle by using a laser-induced method, changes the surface tension coefficient of the solution at the tip of the liquid meniscus through the change of temperature, realizes the adjustment between the electric field force and the surface tension, and further controls the independent injection of each nozzle. In this way, the present invention can realize the independent injection of each nozzle without changing the nozzle structure, and has the advantages of simple nozzle structure and convenient maintenance.

The invention provides a laser deposition workpiece temperature field simulation and microstructure prediction method and system, and relates to the technical field of additive manufacturing. Constructing a finite element model of the deposition structure, and setting laser deposition parameters; constructing a heat source model and a surface growth model; selecting a material type and a calculation type, and setting the mass ratio of each element in the mixed powder as a deposition material, and the material thermophysical property parameters and the temperature gradient of the mixed powder; constructing a laminar fluid flow equation; constructing a non-isothermal flow equation and an equation that the surface tension coefficient changes along with the temperature; simulating a temperature field and a velocity field in the laser deposition manufacturing process; and according to the temperature field and velocity field distribution result, the temperature gradient and the solidification rate of each area in the sedimentary structure are calculated, and microstructure morphology prediction is carried out according to the temperature gradient and the solidification rate. The problem that in the prior art, it is difficult to predict temperature distribution and microstructure morphology of a deposited layer of the titanium-based composite manufactured through laser deposition is solved.

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 discloses a device for measuring a surface tension coefficient and an air viscosity coefficient based on bubbles, and mainly solves the problems that the conventional device for measuring the surface tension coefficient and the air viscosity coefficient is mutually independent and the experiment cost is relatively high. The device comprises a buffer, a variable pressure intensity device connected with the buffer, a thin tube assembly, a bubble hole assembly, a barometer, a sealing piece connected with the thin tube assembly, a backlight source arranged on one side of the bubble hole assembly, imaging equipment arranged on the other side of the bubble hole assembly, and image data processing equipment connected with the imaging equipment. Through the design, two simple and independent experiments in the traditional sense are integrated into an experiment with rich content through the bubble which is an interesting bridge and a new experiment method generated by the bubble, the experimental device has reliable theoretical basis and teaching value, the teaching experiment method is expanded, and the experiment efficiency is improved. And students can be guided to carefully research fluid mechanics knowledge behind the bubble phenomenon.

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 utility model discloses an air control liquid level type liquid surface tension coefficient measurement experimental device which comprises a bottom plate, a vertical rod, a vertical column, a transverse rod, a force sensor, a tray and glassware, wherein the vertical rod and the vertical column are mounted on the bottom plate; the transverse rod is adjustably mounted on the vertical rod; the force sensor is mounted on the transverse rod; the device is characterized in that a glass bottle is connected to the glassware; and the glass bottle is connected with a pressure balloon for controlling the liquid in the glassware to rise and fall and a deflation valve arranged on the pressure balloon. By adjusting the deflation valve on the pressure balloon, the pressure in the glass bottle is reduced during deflation, and liquid in the glassware flows back into the glass bottle, so that the liquid level in the glassware stably descends, the liquid level does not fluctuate during descending, the measurement accuracy is improved, and the measurement repeatability is good; liquid in the glassware and the glass bottle can be replaced through the tee joint with the valve, so that different liquids can be conveniently replaced for experiments, the experiment range is expanded, and the environment is not polluted.

An electronic system is provided, including a memory, a coating path planning processor, and a spraying apparatus. The spraying apparatus sequentially coats adhesive onto a surface. The coating path planning processor receives a mode selection signal and a first adhesive weight, coating height, coating order, viscosity coefficient, and surface tension coefficient from the memory. Based on the mode selection signal and the coating order, a path length is calculated starting from at least one of at least three nodes. A second adhesive weight is calculated based on the coating height, coating order, viscosity coefficient, surface tension coefficient, and path length. When the second adhesive weight is not equal to the first adhesive weight, the coating order is adjusted. When the second adhesive weight equals the first adhesive weight, a planning result representing the end of path planning is generated, and a sequence is generated based on the planning result and an optimization judgment signal.

The present application relates to the technical field of liquid fire experiment, more particularly, to a correction method and device for liquid fire spread speed based on ambient temperature, wherein the fuel density, surface tension coefficient and maximum temperature of surface flow are obtained, and the three unknown quantities are substituted into the expression of surface flow speed; then, the parameters of the expression are inversely solved according to the data of reference experiment, and the relationship between the liquid fire spread speed and ambient temperature is obtained, so as to realize the correction of the error caused by the difference between the ambient temperature of subsequent experiment and that of reference experiment. The whole process is fast and convenient, and the correction relationship of the present application has good correction effect after verification, which can effectively eliminate the error caused by ambient temperature and solve the problem that the liquid fire spread speed is not corrected in the prior art.

The present invention discloses a device for measuring the surface tension coefficient of a liquid based on standing wave vibration, which includes a vibration generator (capable of precisely regulating the output frequency and amplitude), a string support platform (equipped with a standard meter ruler), a fixed pulley, a weight pan and weights, a measuring hanging ring, a water-containing container, a fine screw lifting table, and a CCD camera. The present invention does not need to measure the force when the hanging ring is pulled off, but only needs to measure the position change of the standing wave nodes before and after the water film breaks, so as to calculate the surface tension coefficient of the liquid. It has good measurement stability, high precision, simple operation, intuitive phenomenon, and can be used as a teaching instrument for physical experiments in colleges and universities.

This disclosure relates to the field of display technology, and discloses a support structure and a display device. The support structure is disposed on the non-display side of a flexible display panel. The support structure has a bendable region and includes a support plate and an adhesion improvement layer. In the bendable region, a plurality of perforations are provided on the support plate. The adhesion improvement layer is disposed on the side of the support plate away from the flexible display panel, and is located in at least a portion of the bendable region. The surface tension coefficient of the adhesion improvement layer is greater than that of the support plate, and the surface tension coefficient of the adhesion improvement layer is greater than or equal to 38 mN / m and less than or equal to 42 mN / m. The adhesion performance of the adhesion improvement layer of this support structure is stronger than that of the support plate, thereby making the bond between the support structure and the structure bonded to it more secure and avoiding defects such as delamination or peeling between the support structure and the structure bonded to it.

The invention provides a surface tension coefficient measuring device and method based on visual identification of vertical surface waves, the device comprises a transparent water tank, a constant temperature water tank, a water pipe, a water pump and a camera, the camera directly faces liquid vertically incident to the water tank, a picture of the vertical surface waves is shot, the picture is subjected to preprocessing and edge identification technology to extract surface wave contours, and the surface wave contours are obtained; the wavelength of the vertical surface wave is accurately measured, and the surface tension coefficient of the liquid is calculated according to a fluid mechanics derivation formula, or the upstream height is indirectly measured by visually identifying the bottom position of the vertical surface wave, the surface tension difference of the two liquids is measured, and the surface tension coefficient of the unknown liquid is indirectly measured. According to the method, the contour features of the surface waves are captured and analyzed through the visual recognition technology, the surface tension coefficient of the liquid to be measured can be accurately calculated in combination with a formula derived according to fluid mechanics, and the device can be used for measuring the surface tension difference between different surface tensions or calibrating and measuring the surface tension coefficient of a certain liquid.

The utility model relates to the technical field of display, and discloses a supporting structure and a display device. The supporting structure is arranged on the non-display side of the flexible display panel, the supporting structure is provided with a bendable area, the supporting structure comprises a supporting plate and a bonding improvement layer, and a plurality of hollow holes are formed in the bendable area and in the supporting plate; the bonding improvement layer is arranged on the side, away from the flexible display panel, of the supporting plate, the bonding improvement layer is at least located in at least part of the bendable area, the surface tension coefficient of the bonding improvement layer is larger than that of the supporting plate, and the surface tension coefficient of the bonding improvement layer is larger than or equal to 38 mN / m and smaller than or equal to 42 mN / m. The bonding performance of the bonding improvement layer of the supporting structure is higher than that of the supporting plate, so that bonding between the supporting structure and a structure bonded with the supporting structure is firmer, and the defects such as degumming or stripping between the supporting structure and the structure bonded with the supporting structure are avoided.

The present application relates to the technical field of electronic manufacturing visual detection, in particular to a circuit board welding fault identification method and system based on machine vision, the method comprising: receiving a welding area image and completing gray scale conversion, Gaussian filtering and adaptive threshold segmentation, and extracting a solder joint binary mask. The geometric shape parameters of the solder joint are calculated, the ideal state category is judged through a welding state inference model, the deviation vector is obtained by comparing the ideal state and the actual parameters, and the state inversion calculation is started. The process calls a solder flowability physical simulation engine, simulates the solder spreading behavior based on temperature field and pad layout data, iteratively adjusts the surface tension coefficient and wetting angle parameters, and matches the simulation morphology and the actual morphology until the matching parameters are mapped as the welding fault type. The present application improves the attribution accuracy of circuit board welding fault identification through physical cause inversion and simulation parameter iterative matching.

The present application relates to the technical field of road engineering, in particular to a water solution surface energy parameter testing method based on the surface interfacial tension method, comprising: first, surface tension testing is performed on the water solution to be tested to obtain the surface tension coefficient of the water solution to be tested; then, two kinds of organic reagents are selected, the two kinds of organic reagents are added into two portions of the water solution to be tested respectively, and the two portions are fully placed to form two different organic reagent-water solution contact interfaces; the interface tension of the two interfaces is tested respectively to obtain the interface tension coefficients of the water solution to be tested and the two kinds of organic reagents; finally, the surface tension coefficient, the two interface tension coefficients and the known surface energy parameters of the two kinds of organic reagents are substituted into the equation set based on the GvOC model to solve and determine the surface energy parameters of the water solution to be tested. The present application can accurately test the surface energy parameters of water solutions with different pH values, so as to accurately quantify and evaluate the water stability of asphalt mixtures under different pH value water environments.

The invention discloses a high-precision non-contact type liquid comprehensive performance measuring instrument based on optical measurement, which comprises an aluminum profile bracket, and has the beneficial effects that through highly integrated laser diffraction, optical rotation, grating diffraction and conductivity measurement, on the same platform, the same set of core detection component is utilized, and the measurement accuracy is improved. One-time measurement of liquid surface tension coefficient, viscosity coefficient, density, organic matter concentration, inorganic matter concentration and refractive index key parameters is achieved, compared with a traditional single parameter measurement method needing to replace equipment and samples for multiple times, the measurement efficiency can be improved by multiple times, all optical measurement is in a non-contact mode, and the measurement accuracy is high. Interference of contact type measurement on the liquid state is avoided, and it is guaranteed that the measurement result truly reflects the original property of the liquid; the laser diffraction module multiplexes the same diffraction light path and image acquisition system to synchronously measure the surface tension coefficient and the viscosity coefficient.