5 results about "Laplace pressure" patented technology

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 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.