18 results about "Laplace pressure" patented technology

The invention discloses a three-dimensional self-driven underwater air flow control system, and relates to the technical field of underwater air flow control, and the underwater air flow control system provided by the invention can realize transmission and control of trace gas at a microscopic level, so that new functions and applications which cannot be realized by some traditional liquid microfluids can be realized. Aiming at the defects of a two-dimensional airflow control system, the invention provides a new strategy for constructing a three-dimensional self-driven underwater airflow control system by using Laplace pressure difference in bubbles in combination with a Chinese traditional weaving technology and a super-hydrophobic metal wire. The two ends of the super-hydrophobic metal wires are curled into disc shapes with different sizes by utilizing a Chinese traditional weaving technology, and when the formed framework is immersed into water, the disc structures and the connecting metal wires are wrapped by a layer of retained air, so that a communicated airflow control system is formed.

The invention discloses a condensate bridging backflow vapor chamber and a preparation method thereof, a cavity space is arranged in a shell, and the cavity space is provided with a first wall surface and a second wall surface which are opposite to each other. The surface of the first micro-nano structure of the first wall surface is condensed to form liquid drops, and condensate is spontaneously converged to a specific area at a long distance to form the liquid drops by utilizing Laplace pressure difference between the liquid drops with different curvatures and hydraulic communication of a liquid column in the first micro-nano structure. The hydrophilicity / wicking property of the second micro-nano structure of the second wall surface is superior to that of the first micro-nano structure, wettability difference between the first wall surface and the second wall surface is established, and the collected liquid drops rise and are in contact with the second wall surface to realize high-flux condensate bridging backflow. And the distance between the first wall surface and the second wall surface is adjustable, so that the condensate backflow frequency and the thermal resistance characteristic of the vapor chamber are continuously regulated and controlled. The problems that a traditional vapor chamber is small in area, low in critical heat flow and difficult to adjust in heat flow can be effectively solved.

The invention discloses a mechanical self-adaptive porous valve for passively controlling automatic accumulation and release of bubbles, and belongs to a fluid control technology in the field of bubble energy collection. In order to solve the problem that bubble potential energy is difficult to collect due to the fact that the flux of bubbles released from the seabed is too low, the invention discloses a mechanical self-adaptive porous valve which structurally comprises an upper gas-liquid mixing cavity, a middle porous plate and a lower gas storage chamber. When gas is accumulated in the gas storage chamber below the perforated plate, the bent gas-liquid interfaces protruding upwards in the tiny through holes of the perforated plate can automatically deform along with accumulation of the gas by means of the surface tension effect of liquid, self-adaptive changing Laplace pressure is provided to resist bubble buoyancy, and therefore automatic accumulation of bubbles below the perforated valve is achieved. And after gas accumulation reaches a threshold value, the gas is instantaneously released through the high-permeability porous plate. The instantaneous air inlet rate of the energy collection device can be remarkably increased, and therefore the efficiency of bubble energy collection power generation is improved.

The invention discloses a structured surface based on bionics and an optimization method thereof, and belongs to the technical field of thermal management, and according to the structured surface based on bionics and the optimization method thereof, through the multistage microstructure design of bionic ruellia grass blades, hexagonal columnar infinitesimal elements and conical mastoids are creatively fused, and collaborative optimization of wettability and boiling heat transfer performance is achieved. The I-level infinitesimal structure forms uniform fluid infusion microgrooves through a hexagonal columnar array, the surface roughness is remarkably improved, on the basis, the II-level infinitesimal structure adds a conical mastoid of a plane structure to the top of a columnar infinitesimal, the pinning effect is weakened through 5-micron round corner treatment, the apparent contact angle is further reduced, and the spreading diameter is further increased. According to the multi-stage structural design, vertical transportation of liquid is promoted through the capillary action and the Laplace pressure difference, the motion resistance of liquid drops is reduced through the smooth edge, the spreading limitation of a traditional structured surface is broken through, and a better wetting condition is provided for boiling heat transfer.

The invention relates to the technical field of water purification equipment, and discloses a central pipe for an RO filter element, the pipe wall of the central pipe is provided with at least one row of water inlet holes, each row of water inlet holes is formed by arranging a plurality of water inlet holes in the axial direction of the central pipe, the outer surface of the pipe wall of the central pipe is provided with a water guide groove, and the water guide groove is communicated with the water inlet holes in the axial direction of the central pipe. A water guide groove is formed between every two adjacent water inlet holes, the two ends of each water guide groove are communicated with the water inlet holes respectively, and the width of the middle of each water guide groove is smaller than that of the end of each water guide groove. The width of the middle of the water guide groove is smaller than that of the end of the water guide groove, unbalanced Laplace pressure difference is formed on the surface of the water guide groove, surface energy of liquid drops is increased when the liquid drops flow to the water inlet, the liquid drops form driving force from the narrow portion to the wide portion under the action of the difference, and the flow guide effect of the water guide groove is improved. Pure water can flow from the middle of the water guide groove to the two ends more easily and then enters the center pipe through the water inlet holes, the flow and conveying efficiency of the pure water are improved, and the large flux of the water purifier is achieved.

The invention discloses a sustainable adhesion device for bionic underwater particles. The sustainable adhesion device comprises a microstructure surface and a Laplace differential pressure pump structure, the surface of the microstructure is provided with a plurality of micro-columns and a plurality of micropores which are arranged in an array shape, and the micropores are formed between the adjacent micro-columns; the diameter of the microcolumn is 80 to 120 microns; the diameter of each micropore is 80-120 microns, and the distance between each micropore and the microcolumn is 80-120 microns; a liquid outlet part of the labracian differential pressure pump structure is communicated with the plurality of micropores, and the labracian differential pressure pump structure is used for pumping adhesive liquid out to the micropores to be discharged; at the moment, the silicone oil mediated adhesion work is remarkably improved through the design of the microstructure surface, continuous supply of silicone oil is achieved in combination with a Laplace differential pressure pump structure, and the problem that it is difficult to efficiently and continuously capture particulate matter (such as microplastics, mineral particles and pollutants) in the underwater environment is solved; efficient capture and controllable release of silt and ore grains in the scenes of ocean engineering, underwater desilting and the like are realized.

The present invention relates to a trigger valve integrated with the stop valve to synchronize the flow in parallel microchannels. A stop valve is made by introducing a step on three sides of the microchannel. A step is a 90° divergence along the path of any side of the microchannel. The step is introduced on both the side walls and the bottom wall. Since there is no modification on the top valve, the liquid can move on the top wall freely. A trigger valve is a modified version of the stop valve, where the channel is slowly converging in a curved manner with a pointed tip. Both valves have the same height and width work based on the Laplace pressure change at the meniscus of the flowing fluid. The valves act as pressure barriers to the fluid flow enables synchronizing the flow in parallel microchannels with one single inlet.

A high-speed fog collection method based on the self-driven water jet phenomenon of micro-droplets, belonging to the field of fog collection, is realized by a fog collector and the water inside the fog collector. The inner and outer surfaces of the fog collector have superhydrophobicity, and the surface through-hole array thereof has superhydrophilicity. The outer surface of the fog collector can easily capture the tiny fog droplets in the fog flow. The tiny fog droplets grow and merge on the outer surface of the fog collector to form sub-millimeter-sized micro-droplets. The superhydrophilic through-holes on the surface of the fog collector will be wetted by the water inside the fog collector. Once the micro-droplets come into contact with the superhydrophilic holes, they will form a whole with the water inside the fog collector. The micro-droplets will enter the inside of the fog collector under the action of the internal Laplace pressure and generate a water jet phenomenon. In addition, the micro-droplets will also merge with other micro-droplets around the superhydrophilic holes during the process of entering the inside of the fog collector and enter the inside of the fog collector together. The present invention has the advantages of small droplet shedding size, high droplet shedding frequency, and high fog collection rate, etc.

The invention discloses a loop heat pipe for replacing liquid return of a capillary core with the Laplace pressure difference of a conical channel, and belongs to the technical field of loop heat pipes. The loop heat pipe comprises an evaporation cavity, a condenser, a steam pipe and a liquid loop, and the input end of the steam pipe is connected with the output end of the evaporation cavity; the input end of the steam pipe and the input end of the condenser are connected with the input end of the evaporation cavity through a liquid loop, a conical liquid return channel and a micro valve are additionally arranged on the liquid loop, and the conical liquid return channel is provided with a large end and a small end; the evaporation cavity is connected with the condenser through a steam pipe, the condenser is connected with the liquid collecting cavity, and the liquid collecting cavity is connected with the large end of the conical liquid return channel. According to the loop heat pipe, the contact angle theta of the lyophilic surface in the conical liquid return channel is smaller than 90 degrees, so that a liquid-gas interface generates higher curvature at the small end, Laplace pressure difference is formed, liquid is pushed from the large end to the small end to complete liquid return, a traditional capillary core structure is not needed, the problem that pores of a capillary core are prone to being blocked is solved, and the service life of the loop heat pipe is prolonged.

The invention provides a heat exchange tube with resistance reducing and evaporation strengthening performance and a special manufacturing device and method thereof.The heat exchange tube comprises a base tube, the inner wall of the base tube is provided with zigzag flow guide strengthening grooves with gradient changes, and the surfaces of the grooves are covered with red copper particle layers; the density, the size and the roughness of the flow guide enhancing grooves are increased in a stepped or continuous mode from the pipe bottom to the pipe top, fluid is driven to move upwards through Laplace pressure difference, and the problem of uneven liquid film distribution is solved. The special manufacturing device comprises a fixed base, a rotating base plate and a fret saw, front bolt holes are formed in the rotating base plate at intervals of 1 degree, and circumferential precise positioning of a base tube is achieved through an angle progressive mechanism; the manufacturing method comprises the steps that step-by-step angle machining (rotation angle control) is carried out, and grooves are scraped in cooperation with diamond fretsaws of different mesh numbers; and electroplating and depositing a red copper particle layer. Experiments prove that the heat exchange coefficient is increased, and the friction pressure drop is reduced.

The invention provides a micro-piezoelectric oscillation type mustard gas supply device for toxic agent detection and calibration, and belongs to the technical field of toxic agent detection.The micro-piezoelectric oscillation type mustard gas supply device comprises a dynamic generation module, a gas mixing cabin module, a flow control module, a temperature control module, a pressure control module and an interaction control module, and a control chip is arranged in the dynamic generation module; the control chip is internally provided with a dynamic generation control module, and is characterized in that the dynamic generation module comprises a liquid tank chamber assembly, a circuit driving assembly, a micro-piezoelectric device and a spray head substrate, the micro-piezoelectric device converts an electric signal into mechanical oscillation, and the spray head substrate releases liquid mustard gas in an aerosol form through a micropore nozzle; the dynamic generation control module is used for calculating parameters required by micro-droplet formation through a Laplace pressure equation and analyzing a liquid jet fracture process in combination with a Kelvin Helmholtz interface instability model, so that high-precision stable generation and precise control of the mustard gas standard gas concentration are realized.

The invention belongs to the technical field of condensation and heat and mass transfer, and relates to a composite microstructure surface based on multidirectional Laplace pressure gradient reinforced bead condensation, which comprises a super-hydrophobic substrate with an axis and a super-hydrophobic three-dimensional composite microstructure distributed on the top surface of the super-hydrophobic substrate, the super-hydrophobic three-dimensional composite microstructure comprises a plurality of wedge-shaped column structures arranged in the horizontal direction, the wedge-shaped column structures are distributed on the super-hydrophobic substrate in a multi-column mode, each wedge-shaped column structure is provided with a wide end and a narrow end, and the wide ends and the narrow ends of the wedge-shaped column structures in each column are sequentially and alternately arranged. The wedge-shaped column structures in every two adjacent columns are symmetrical in the axis direction of the super-hydrophobic substrate, a gap is formed between every two wedge-shaped column structures which are symmetrically arranged in every two adjacent columns, and a V-shaped groove structure with a V-shaped longitudinal section is formed between every two adjacent wedge-shaped column structures in each column. According to the invention, the probability of liquid drop bounce is improved.

The invention is suitable for the technical field of atomization, and provides a liquid guide structure, an atomization core and an aerosol generating device.One side, in the first direction, of the liquid guide structure is used for arranging a heating structure, a plurality of microcavity sets are arranged in the liquid guide structure, and each microcavity set comprises a plurality of microcavities arranged in the second direction; the microcavity group is provided with a first end and a second end which are opposite in the second direction, at least part of each microcavity is gradually expanded from one end close to the first end in the direction from the first end to the second end, and the first direction is perpendicular to the second direction. The arrangement is such that the aerosol-generating substrate located at the group of microcavities can be rapidly transported from the first end towards the second end under the synergistic effect of a Laplace pressure gradient and a wetting gradient. The second direction can be arranged in the longitudinal direction, and the first end is located at the bottom of the second end, so that the liquid guiding efficiency of the liquid guiding structure from the bottom to the top can be improved, and the problem of core burning caused by dry burning due to low liquid guiding efficiency of the liquid guiding structure is solved.

The present invention provides an electronic packaging welding substrate and a welding method capable of removing bubbles. The electronic packaging welding substrate comprises a substrate. A micro-nano structure is provided on the welding surface of the substrate, forming a wettability that gradually decreases from the center of the substrate toward the outside, and a plurality of grooves are provided. The plurality of grooves divide the welding surface of the substrate into a plurality of wettability gradient areas. A plurality of wetting grooves extending from the welding surface of the substrate to the bottom of the grooves are formed on the inner side surfaces of the grooves. On the one hand, bubbles in the molten solder are moved from the center to the periphery under the action of the wetting gradient force during high-temperature welding. On the other hand, the shape of the grooves can form Laplace pressure, further strengthening the movement of bubbles from the center to the periphery. The wetting grooves can enable bubbles to move from the bottom of the grooves to the welding surface of the substrate, preventing bubbles from being deposited in the grooves. Since the bubbles move from the center of the substrate to the periphery and escape in time, the effective contact area is increased, thereby improving the reliability of the chip and having good practicality.

The invention discloses a spherical net-shaped bubble capturing device for collecting and converging multidirectional microbubbles, and belongs to a bubble collection technology in the field of bubble energy collection. In order to solve the problem that bubble potential energy is difficult to efficiently collect due to the fact that seabed bubbles are small in size, distributed dispersedly and random in movement direction, the spherical net-shaped bubble capturing device comprises a transverse spindle structure and a longitudinal arc structure, and the arc structure is connected with spindle joints in the middle of the spindle structure in a crossed mode. And both the two have super-aerophilic surfaces. The transverse spindle structure adsorbs and captures microbubbles from all directions through the super-aerophile surface, and the Laplace pressure generated by the geometrical shape gradient of the transverse spindle structure drives the bubbles to move from the tip ends of the cones on the two sides to the spindle joint in the middle. The longitudinal arc structure drives bubbles to slide upwards from the spindle joints and converge to the top end of the spherical surface through buoyancy. According to the invention, the capture rate of multidirectional dispersed microbubbles and the efficiency of bubble energy collection and power generation can be obviously improved.

The application provides a bubble separation device, which is connected with a working electrode of hydrogen production by electrolysis of water, and is applied to separation and directional regulation of bubbles generated on the surface of the working electrode. In the application, a triangular area between adjacent through grooves is used to form a bubble separation channel, the bubble separation channel can generate an asymmetric Laplace pressure gradient, so as to drive the bubbles to move in a specific direction. Meanwhile, the super-hydrophobic-lubricating composite coating has excellent gas affinity and lubricating performance, not only provides good bubble adsorption conditions, but also reduces the frictional resistance of the bubbles when moving on the surface through the surface lubricating effect, so that the bubbles can quickly realize directional regulation and transfer. The hydrogen bubbles generated on the surface of the working electrode tend to move to the surface of the super-hydrophobic-lubricating composite coating and transfer to the bubble separation channel, by using the asymmetry of the bubble separation channel, through a self-driven "moving-merging-moving" circulation process, the bubbles are directionally moved and efficiently collected to a target position.

The present invention discloses a three-dimensional self-driven underwater gas flow control system, which relates to the technical field of underwater gas flow control. The underwater gas flow control system provided by this application can achieve the transmission and manipulation of trace gases at the micro level, so that some new functions and applications that cannot be achieved by traditional liquid microfluidics can be realized. Aiming at the deficiencies of two-dimensional gas flow control systems, a new strategy for constructing a three-dimensional self-driven underwater gas flow control system by combining traditional Chinese weaving techniques and superhydrophobic metal wires and utilizing the Laplace pressure difference inside bubbles is proposed. Using traditional Chinese weaving techniques, the two ends of the superhydrophobic metal wire are curled into disk shapes of different sizes. When the formed framework is immersed in water, the disk structure and the connecting metal wire will be wrapped by a layer of trapped air, thus forming a connected gas flow control system.

This invention discloses a spherical mesh bubble capture device for collecting and converging multi-directional microbubbles, belonging to the field of bubble energy harvesting technology. To address the problem of inefficiently collecting the potential energy of seabed bubbles due to their small size, dispersed distribution, and random movement, this invention discloses a spherical mesh bubble capture device, comprising a transverse spindle structure and a longitudinal arc structure. The arc structure and the spindle structure are intersected by spindle segments, both possessing superaerophilic surfaces. The transverse spindle structure relies on its superaerophilic surface to adsorb and capture microbubbles from various directions, and utilizes the Laplace pressure generated by its geometric gradient to drive the bubbles from the tips of the two conical sections towards the central spindle segment. The longitudinal arc structure uses buoyancy to drive the bubbles to slide upwards from the spindle segment and converge at the top of the spherical surface. This invention can significantly improve the capture rate of multi-directionally dispersed microbubbles and the efficiency of bubble energy harvesting for power generation.