10 results about "Laplace pressure" patented technology

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 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 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.

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.