172 results about "Surface tension force" patented technology

A medical device having a housing (2) with a bore (3) and a lancet (1) slidably fitting in the bore. The lancet operates as a positive displacement piston. In a retracted position, in which the lancet is rearwardly displaced along the bore to define a fluid-containing space in the bore forwardly on the lancet tip, the fluid-containing space has a cross-section dimension to allow fluid to be retained therein by surface tension. The device has a seal (6) operable substantially to prevent flow of fluid from the fluid-containing space past the seal means on movement of the lancet. Displacement of the lancet between the puncture and retracted positions provides suction for drawing fluid into and along the fluid-containing space from the forward end of the bore, and / or pressure for expelling fluid from the fluid-containing space via the forward end of the bore. Also disclosed are methods for operating the device.

The present invention alters the flow path at the inlet of the sheet glass forming apparatus to improve quality. The bottom of the downcomer pipe is preferably shaped to alter the character of the vortex flow in the quiescent flow zone between the pipes. In another embodiment, a bead guide provides hydraulic stresses that are in opposition to the surface tension stress and thus reduces the influence of surface tension on the formation of thick beads on the edges of the sheet. The present invention also measures the temperature of the glass by immersing thermocouples in the glass, at locations where any defects caused by the immersion are in the glass that forms the unusable edges of the sheet. In another embodiment, the support structure for the trough is altered to substantially reduce the aging of the trough due to thermal creep.

The liquid to be atomized is uniformly sprayed on the inner surface of a hollow rotating cylinder, for example by means of one- or two-fluid-nozzles and is thus distributed on bores provided in the cylinder wall. The rotation of the cylinder causes the liquid to flow outwards through the bores. Droplets are generated when the liquid flows out of the bores by laminary decomposition of the jet. The flow rate in each bore lies in the range 1.0<+E,dot V+EE B (a3 rho 5 / sigma 5)0.25<16 to prevent the droplets from becoming too large and to satisfy the condition of an adequate flow laminarity, i.e. for the value of the Reynolds number for the continuous liquid flow in the boress not to exceed Re delta 400. +E,dot V+EE B represents the flow rate of the liquid in each bore, a represents the centrifugal acceleration at the outer surface of the cylinder, rho represents the density of the liquid and delta indicates the surface tension of the liquid. The large number N>200 of bores having the diameter DB in the cylinder wall causes the flow rate of liquid through each bore to be relatively low, so that a continuous laminary flow in each bore is ensured even at low viscosities and technically useful total flow rates. Preferably cylindrical bores with a minimum length at least three times larger than the bore diameter are provided in the cylinder wall, with a narrow spacing in the range defined by 1.1<t / DB<5, so that a number of bores as large as possible may be arranged in the wall of the cylinder.

A quantitative suction tip to be attached onto the tip of a suction nozzle 5 comprises a fixed volume chamber 12 with a predetermined volume. The fixed volume chamber 12 has a suction opening formed at a lower end thereof and a division wall 13 formed at an upper end thereof. The division wall 13 has a through hole 15 which has a smaller cross-sectional area than that of the fixed volume chamber 12. As a liquid fills the fixed volume chamber 12 and reaches the through hole 15, there is caused a change in the suction pressure which is detected to terminate a suction operation. Thus, a predetermined quantity of the liquid can be accurately drawn into the quantitative suction tip without being affected by e.g. the surface tension and viscosity of the drawn liquid or the wettability of the inner walls of the quantitative suction tip.

There is provided a microchip having an introduction portion introducing a liquid, a valve, and an ejection portion ejecting the liquid. The valve connects the introduction portion and the ejection portion, and retains the liquid such that surface tension of the liquid prevents the liquid from being ejected to the ejection portion. The liquid can be ejected from the introduction portion to the ejection portion by applying to the liquid centrifugal force larger than the surface tension of the liquid. Such a microchip according to the present invention has a simple configuration and allows easy control of retaining and flowing of a liquid.

A device for separating water from debris and collecting rain water includes an upper portion and a lower portion. The upper portion includes an inlet and a structure for separating water from debris with surface tension and surface area. The lower portion is removably mounted to the upper portion and includes a first outlet configured to be fluidically coupled to a downspout and a second outlet configured to be fluidically coupled to a container for holding collected rain water. A rain water collection system including the device is also provided, as well as a method of using the device.

A method and apparatus for determining the contact angle and / or surface tension of a liquid on a solid surface is described. The method involves placing a fluid drop on a solid surface, and gradually increasing its volume by adding more fluid, while continuing to determine the corresponding increase in fluid height, until the drop attains maximum height beyond which additional fluid only increases the drop footprint and not height, and determining the equilibrium height and in turn the contact angle by means of an equation that correlates contact angle with depth below the fluid surface, together with the fluid surface tension and liquid density. The method may in turn be used to determine the fluid surface tension from the equilibrium height when the contact angle and density of the fluid are known.

The separator has a vane assembly made up of a number of corrugated vanes that provide serpentine paths for the gas stream therethrough. As the gas stream flows through the serpentine paths, it changes direction and liquid in the gas stream impacts the surfaces of the vanes. The upstream section of the vane assembly has roughened surfaces to decrease the surface tension of the liquid, thereby causing the liquid to coalesce. The downstream section of the vane assembly has smooth surfaces so as to increase the surface tension of the liquid. The vane assembly is followed by filters, which capture the liquid that passes through the vane assembly. The vane assembly coalesces the liquid to enable the filters to operate more effectively.

The invention discloses a full-process biological detection device, belonging to the technical field of biological detection. The a full-process biological detection device comprises at least one reactor, wherein the reactor comprises at least one sample adding unit, at least one controlled liquid release unit, at least one extraction unit, at least one controlled liquid switching unit, at least one liquid storage unit, at least one liquid transfer unit, at least one liquid flow control unit, at least one quantitative liquid dispersion unit and a plurality of reaction tanks, wherein all the above units communicate with each other through runners according to a preset sequence, and when the reactor rotates around a chip rotating shaft, liquid in the reactor can flow to downstream unit fromupstream unit through the runners under the driving of centrifugal force or surface tension or both the centrifugal force and the surface tension. The full-process biological detection device providedby such a scheme has the characteristics of high integration level, no need for additional reagents, simplicity in operation, stability, reliability and the like, realizes full-flow closing of a target during biological detection, and effectively avoids cross contamination between samples and equipment.

An analyser comprising a source of electromagnetic radiation, a detector for said radiation and a drophead comprising a surface which is adapted to receive a drop of liquid to be tested, the drophead being positioned in use relative to the source and detector to illuminate a drop received thereon and to cause an interaction in the path of the electromagnetic radiation between the source and detector, characterised in that said surface of said drophead is dimensioned to constrain the drop to adopt a shape which is dominated more by surface tension forces than by gravitational forces.

The invention discloses a strong emulsibility microbe wax cleaning and preventing bacterial agent and an application, which belongs to the oil field chemical technology field. The wax cleaning and preventing bacterial agent mainly comprises pseudomonas aeruginosa and geobacillus sp, has strong emulsification capability, and is capable of dispersing crude oil, promoting crude oil to flow, changing adherence force of borehole wall, preventing the accumulation of wax crystal on the borehole wall, and playing the paraffin inhibition and wax cleaning effects. By increasing the initial application amount of the bacteria liquid and prolong the well closing time, a stable paraffin inhibition zone can be formed due to adhesion of bacteria on borehole wall, near wellbore formation can be cleaned, and the paraffin inhibition and oil increase effects can be increased. After on-site enforcement, the well cleaning and chemical paraffin inhibition works can not be carried out in recent half year in the test wells, so that the wax cleaning and preventing bacterial agent has good paraffin inhibition effect in the well. The oil production is increased by about 30% daily, pump efficiency is increased about 10%, the surface tension of the output liquid is decreased to 20-25%, and the crude oil condensation point is decreased by 1-3 DEG C.

The present invention provides an apparatus for efficiently transporting or dispensing transport objects including not only particles but also liquid samples. A liquid in a first liquid transport pipe (3) is fed at a liquid feed velocity (V1), and a liquid droplet is formed toward an open end of a second liquid transport pipe (4) disposed with an air gap (11) in between. The particle is released into the liquid droplet, so that the particle is enclosed in the liquid droplet. Suction with a liquid feed velocity (V2) is applied to the inside of the second liquid transport pipe. Since the relationship between V1 and V2 is V1<V2, the liquid droplet, after reaching the open end (10) of the second liquid transport pipe, is sheared off by suction, thereby forming a liquid section in the second liquid transport pipe. Thus, the particle in the liquid section, held under surface tension on a gas-liquid phase boundary, can be transported into a particle array container with stability in conjunction with the liquid section.

The invention relates to a vinyl acetate-acrylate copolymer emulsion, which is prepared by adopting OP-10, SDBS, SVS, water, acrylic acid and a seed emulsion as the bottom water system, taking VAc, BA and AA as the monomer, employing ammonium persulfate as the oxidant, and using sodium bisulfite as the reducing agent. Specifically, the seed emulsion in the bottom water system is prepared by using SDBS, OP-10, AA, sodium carbonate and water as the base solution, adopting VAc, BA and AA as the monomer, employing SDBS, OP-10, sodium carbonate and water as the pre-emulsification system, taking ammonium persulfate as the oxidant, and adopting sodium bisulfite as the reducing agent. The emulsion provided in the invention has a solid content of 40%-45%, viscosity (in terms of a 4-cup application amount) of 20S-26S, bonding peel strength (N / 2.5cm) of 1.4-2.5, a surface tension force of 32-37 dyne, and a film contact angle of 25-29 degrees, thus being particularly suitable for application in dry paper-plastic or plastic-plastic composite adhesives. The preparation method of the vinyl acetate-acrylate copolymer emulsion has the characteristics of mild reaction conditions and safety reaction system, thus being conducive to factory mass production.

The invention relates to a method for controlling liquid drops by virtue of a micro-electromagnetic bar. According to the method, a micro-electromagnetic bar and a substrate which are subjected to super-hydrophobic surface treatment are taken as platforms based on competition of magnetic force, surface tension and gravity, the micro-electromagnetic bar is switched on or off so as to absorb and release magnetic bead-containing liquid drops on the surface of a super-hydrophobic surface, and the operations of transportation, fusion and mixing of the magnetic bead-containing liquid drops and the control of the separation between solid-phase magnetic beads and liquid-phase magnetic beads in the magnetic bead-containing liquid drops are finished by virtue of placement of the micro-electromagnetic bar or a liquid drop seating platform. According to the method for controlling the liquid drops by virtue of the micro-electromagnetic bar, the liquid drops can be rapidly and flexibly controlled, and the actual application and rapid development of a digital microfluidic technique are hopefully promoted.

The invention discloses an anti-water blocking agent for drilling fluid. The anti-water blocking agent is formed by mixing the following components: at least one main surfactant capable of reducing surface tension of a solution, at least one auxiliary surfactant capable of improving the drainage assisting capability and minimizing the water saturation of a rock core, inorganic salts, and the balance of water. The anti-water blocking agent disclosed by the invention can be used for greatly reducing the surface tension or interfacial tension of the solution, changing the interface state of a solution system, producing a wetting or anti-wetting effect, improving the relative permeability of a gas phase and enabling the injection process to overcome water blocking damages.

The invention relates to a bionic gradient super-hydrophobic structure design method based on the Marangoni effect, and belongs to the technical field of micro-nano structure functional surface designand preparation. The method includes: single surface array structure is firstly constructed according to the characteristics of the hydrophobic surface structure, and the contact angle of the surfacestructure is calculated in combination with a Wenzel and Cassie model; different single array structures with the same parameters are constructed, the contact angles of all the structure models are compared, a structure sequence is constructed according to the contact angles, the structure parameters are finely adjusted, and then the structure sequence is constructed to form a continuous gradientcomposite array structure; a nanometer heating sheet is installed on a single structure, different temperature values are set to form a temperature gradient, and under the coupling of the structure gradient and the temperature gradient, due to the change of surface tension, liquid drops spontaneously move from a surface with a large contact angle to a surface with a small contact angle. Therefore, the surface tension difference caused by the Marangoni effect promotes directional movement and automatic rolling of the liquid drops, so that the self-cleaning characteristic is realized.

The invention discloses a surface tension and surface area viscosity measuring device. Before gas is introduced into a gas bottle, an open container rises. After a capillary absorbs a proper amount of a liquid sample, the open container descends. Then gas is introduced into the capillary from the gas bottle to form a bubble in the capillary. A camera or video camera is provided to record the forming process of a bubble and the shape images of the bubble so as to measure the radius of the bubble. A differential pressure meter is arranged on the outside of a testing box and is communicated with the gas which is introduced into the capillary, so the differential pressure meter can read the pressure difference between the inner and outer of the bubble. Then the surface pressure can be calculated through the Laplace formula, and thus the calculation of surface tension is greatly simplified. The surface area viscosity can be calculated by the following steps: measuring the surface tension during the unbalance state and balance state, recording the time, calculating the surface area according to the images, and finally substituting the data into a formula to calculate the surface area viscosity. The device has the following advantages that the sample using amount is little, the moisture of the sample is not required, the measuring speed is fast, the precision is high, and the equipment utilization rate is high.

The invention provides a plate-type surface tension storage tank. The plate-type surface tension storage tank comprises a guide plate assembly, a lower management cabin assembly and a liquid pipe, theguide plate assembly comprises an upper shell, a connecting ring and a flow guide plate, the flow guide plate is connected into grooves of the upper shell and the connecting ring, and the upper shellis provided with a gas-liquid opening; the lower management cabin assembly comprises a lower shell, blades, a pressing plate and a barrel collecting assembly; the blades are respectively connected with the barrel collecting assembly, the pressing plate and the lower shell, and the barrel collecting assembly is connected to the lower shell; wherein the upper shell is connected with the lower shell; one end of the liquid pipe is connected with the gas-liquid port, and the other end of the liquid pipe is connected with the cylinder collecting assembly. The plate-type surface tension storage tankhas the advantages of being more suitable for various liquid propellants, more sufficient in ground performance verification and the like, and can serve as a liquid propellant management plate type surface tension storage tank in aerospace products such as satellites.

The invention relates to a dynamic measurement method for interfacial tension between two liquids. A liquid surface tension dynamic measurement device is used for measurement; a change curve of voltage U with time T during the process of a metal ring entering from a liquid I to a liquid II is measured; during the process of the metal ring completely entering from the liquid I to the liquid II, themaximum value U1 of the voltage before a liquid film of the liquid I is broken by pulling in the liquid II is recorded, the corresponding tensile force is f1, the value U2 of the voltage after the liquid film of the liquid I is broken by pulling and tends to be stable, the corresponding tensile force is f2, the interfacial tension between the two liquids is the force (f1-f2) / l for breaking the liquid film by pulling during the process of the metal ring completely entering from the liquid I to the liquid II per unit length, and the interfacial tension between the two liquids is as shown in thespecification. The liquid surface tension dynamic measurement device is used for experiments, experimental results are analyzed and calculated, a way to measure the interfacial tension between the two liquids is developed, the measurement method is simple and easy, and the measurement results accurate.

The invention relates to a critical liquid-carrying flow calculation method considering droplet deformation and multi-parameter influence in the field of reasonable production allocation of gas reservoirs. The method solves the problem of deviation existing in judgment of gas well effusion at present, and mainly comprises the following steps: solving the maximum size parameter of ellipsoidal liquid drops based on the liquid drop breaking principle; based on the balance of gravity, a drag force and buoyancy borne by the liquid drops, acquiring a critical liquid-carrying flow velocity expression; considering the influence of the change of the incident flow area of the liquid drops due to deformation on drag coefficients and the influence of different pressures, temperatures and pipe diameters on parameters such as gas-liquid two-phase friction resistance, gas-liquid surface tension and the like, and establishing a critical liquid-carrying flow calculation model considering multiple parameters; and finally, solving the model by adopting a multi-parameter iteration mode to obtain the critical liquid-carrying flow of the gas well. The method has the advantages that the gas well effusionis accurately predicted, the influence of multiple parameters on the critical liquid carrying flow is considered, calculation is accurate, and use is convenient.

A liquid surface tension coefficient measuring method relates to measurement of liquid physical parameters and adopts the technical scheme that a spirit bubble is arranged on the bottom surface of theinner side of a cylindrical container, a water outlet pipe is fixed on the bottom surface of the cylindrical container, and the outer diameter of an outlet of the water outlet pipe is d; the inner bottom surface of the cylindrical container is horizontal; a recovery container is arranged below the outlet of the water outlet pipe of the cylindrical container; liquid is injected into the cylindrical container until liquid drops flow to the recovery container from the outlet of the water outlet pipe, the distance h between the liquid level at the upper end and the horizontal plane of the outletis measured when no liquid drops drop from the outlet of the water outlet pipe, and the diameter of the inner side of the cylindrical container is more than 100 times of the outer diameter of the outlet of the water outlet pipe; the surface tension coefficient sigma of the liquid is equal to rho * g * h * d / 4, rho is the density of the liquid, and g is the gravitational acceleration. The measurement method is simple and accurate.

This invention relates to a device and method for engineering microchannel geometries to take advantage of surface tension to guide fluid location. This technology may be used to construct compartmentalized systems of various materials that are added in liquid state, and may be used in a liquid state, or may be solidified, gelled, cross-linked, polymerized, or alternatively may be accumulated through gravity (e.g. cell settling), or centrifugation.

The invention relates to a surface tension tester and a surface tension test method. The tester comprises a measured solution container for holding a solution to be tested, a capillary tube which is vertically inserted into the measured solution container and the tip of which is tangent with the liquid level to be tested, a decompressor, and a pressure gauge which is communicated with the measured solution container and the decompressor through rubber tubes, wherein the measured solution container is provided with a constant-temperature device. The method adopts the surface tension tester for testing. The tester has a reasonable structure, is convenient to operate, can improve the accuracy of the test result and improve the test speed and the work efficiency, and is suitable for scientific research institutions and laboratories of colleges and universities.

The invention provides a liquid detection method and a system based on measurement of surface capillary waves with structured light. The liquid detection method comprises steps of generating surface waves of liquid to be measured and projecting the predetermined structured light onto the surface of the liquid to be measured; analyzing actual height change represented by stripes of the surface waves of the liquid to be measured to obtain a wavelength of the surface capillary waves of the liquid to be measured; calculating surface tension of the liquid to be measured based on the wavelength of the surface capillary waves, and obtaining a type of the liquid to be measured according to an established relationship between the liquid type and the surface tension of the liquid. The method and thesystem of the present invention use the characteristics of surface capillary waves of the liquid to propose a high-precision, low-cost, and universal detection mechanism.

The invention relates to a nuclear reactor plate fuel melting fluid-solid coupling meshless analysis method. The method comprises the following specific steps: 1, carrying out initial modeling on a plate fuel under a Cartesian coordinate system; 2, searching neighbor particles by adopting a linked list method, and storing neighbor particle information in an array; 3, explicitly calculating a gravity item, a viscosity item and a surface tension item in the momentum conservation equation to obtain the estimated speed and position of the particles; 4, calculating heat transfer among particles, and judging the phase state of the particles by using an enthalpy value phase change model; 5, searching whether collision among solid particles exists or not, and performing calculation by using a DEM model; 6, implicitly calculating a pressure gradient item, and correcting the speed and position of particles; 7, outputting a required result, and advancing the time step until the simulation is finished. According to the method, all situations of melt fluid-solid coupling of the nuclear reactor plate-shaped fuel are considered, wherein the particle method can accurately capture the free liquid level of the melt, and the solid-liquid coupling model can analyze the action between the melt and fuel particles.

The invention discloses hyperbranched polyoxyethylene ether and a preparation method thereof, and side-chain hyperbranched polycarboxylic acid prepared by taking hyperbranched polyoxyethylene ether as a macromonomer. The side-chain hyperbranched polycarboxylic acid employs the hyperbranched polyoxyethylene ether for substituting traditional straight-chain polyoxyethylene ether as the macromonomer for synthesis. The side-chain density of the polycarboxylic acid can be enhanced, under same ethoxy polymerization degree, the ethoxy density of the polyoxyethylene ether macromonomer is increased, the surface tension force and the apparent viscosity of a polycarboxylic acid solution are reduced, and the foaming performance of the polycarboxylic acid is effectively increased.

The properties of a fluid body in the form of a surface-attached droplet / bubble can be determined. A data set is stored describing a plurality of droplets / bubbles of different shapes; each shape is captured as a combination of two or more linear dimensional measurements. For each shape the data set includes one or more parameters describing the relationship between the physical properties of a pair of fluids capable of forming that shape as a surface-attached droplet / bubble disposed in a surrounding fluid medium. A fluid body is provided in the form of a surface-attached droplet / bubble and a plurality of linear dimensional measurements are taken and provided as input to a processing apparatus. Processing apparatus determines from the data set the one or more parameters associated with the shape described by said linear dimensional measurements. Particular the surface tension of a fluid can be found in this way based on simple dimensional measurements.

The invention discloses a waterproof and breathable electric appliance cavity structure which comprises a cavity of an electric appliance. The structure is characterized in that a through hole communicating the inside with the outside of the cavity is formed in a cavity wall, a waterproof and breathable film is covered on the through hole, and air holes preventing liquid water from passing are formed in the waterproof and breathable film. Particles become big after water molecules are condensed to become water drops, and due to action (the water molecules pull and contend against each other) of surface tension of the water drops, the liquid water cannot pass a bore diameter capable of allowing free water molecules to pass in a normal-pressure state, so that the waterproof and breathable film is enabled to have a waterproof and breathable function, waterproofing can be realized, and the problems of ventilating and air pressure balancing between the inside and the outside of the cavity of the electric appliance can be solved.

The invention relates to an automatic device for measuring compartment pressure and a measuring method of the automatic device. The automatic device belongs to a mechatronics product and relates to the mechanical automation, measurement and control field. The device consists of a constant-speed push injection device, a pressure conduction device, a display measurement and control portion, a shell and a power source. Ports of a tee joint in the pressure conduction device have small pressure difference under the condition that flow speed of incompressible liquid is quite low, measurement errors depend on measurement of the flow speed of the liquid at a measuring end, materials of rubber tubes, length, diameter, height, sizes of needle heads and the like, correction of surface tension of liquid droplets and extraction algorithm of effective values of software, and a pressure error value can be changed along with change of the parameters, and can be calculated by the measurement and control portion by means of simulating a pressure error condition, so that an actual pressure value is obtained, namely error correction technology is realized. In a non-liquid environment, pressure cannot be directly measured and is necessarily measured indirectly, liquid is injected into the non-liquid environment at different steps within a short time, when air column pressure is smaller than compartment pressure, the liquid does not enter the human body, only air is compressed, once the air column pressure achieves the compartment pressure, the liquid can flow into the human body, at the moment, balance is realized, and the air column pressure is equal to the compartment pressure, namely a pressure balance measurement mode is realized.

The invention discloses a low-cost wide-adaptation centrifugal digital droplet generation method and device, an upper-layer water phase centrifugal unit is embedded in a lower-layer oil phase centrifugal unit, a micron tube is arranged at the lower part of the upper-layer water phase centrifugal unit, and under the action of centrifugal force, the upper water phase overcomes the surface tension effect, liquid drops generated through the micro-tube channel enter the lower oil phase to form water-in-oil liquid drops with uniform sizes, and the sizes of the water-in-oil liquid drops are adjustedby adjusting the diameters of the micro-tubes and / or the centrifugal force. A mutually soluble laser-induced curing agent can be added into the oil phase, and the oil phase is quickly crosslinked andcured under the action of an induction source; the invention is applied to nucleic acid isothermal amplification to realize digital nucleic acid amplification. According to the invention, water-in-oildroplets with uniform size and high quality can be generated. The micro-liter aqueous phase solution can quickly generate high-flux water-in-oil droplets within a few minutes, the high-flux water-in-oil droplets are combined with isothermal amplification of nucleic acid, and meanwhile, ultrafast solidification of the droplets can be realized by virtue of a solidification platform.