Patents
Literature
Eureka-AI is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Eureka AI

2076 results about "Heat transfer efficiency" patented technology

Heat transfer is most efficient by convection, then by conduction; radiation is the least efficient and slowest means of heat transfer. Low efficiency of heat transfer means that vacuums make excellent insulation.

Method for prolonging service life of face milling cutter based on heat pipe phase changes

The invention provides an environment-friendly method for prolonging the service life of a face milling cutter based on heat pipe phase changes, so durability of the face milling cutter can be remarkably improved under a milling especial for high-speed milling machining condition. The method comprises a novel face milling cutter. The novel face milling cutter comprises a heat pipe, a face milling cutter shank, a face milling cutter body and a face milling head. The face milling head is arranged at one end of the face milling cutter body, the face milling cutter shank is arranged at the other end of the face milling cutter body, the heat pipe is implanted into the face milling cutter body from the face milling cutter shank in the direction parallel with the axis of the face milling cutter body and is close to the main cutting edge part on the face milling head, and the heat pipe is filled with a liquid absorption core. Heat pipe phase change heat transferring is adopted in the method, so the heat pipe is higher than cutting fluid in heat transfer efficiency. A heat pipe technology is adopted, the cutting temperature of the face milling cutter is lowered, the heat pipe is more environment-friendly than the cutting fluid, and personal injuries to operation staff do not exist. In addition, the heat pipe adopted in the method is cheaper than the cutting fluid in market price, and therefore manufacturing cost of products of enterprises can be reduced.
Owner:ANHUI AGRICULTURAL UNIVERSITY

Dual-heater mobile-heat-shield type Czochralski crystal growing furnace

The invention discloses semiconductor material growing equipment, and in particular relates to a Czochralski crystal growing furnace for semiconductor single crystal growth. In the invention, the downward motion of a heat shield is used to replace the upward motion of a crucible, so that the crucible can only rotate and not ascend any more, thus, one degree of freedom is reduced and the system complexity is decreased; by adopting dual heaters respectively located at the bottom and the side face of the crucible respectively to control the growth of a crystal by aiming at different stages respectively, the temperature gradient control of the crystal and melt is more convenient; the relative positions between the crucible and the heaters are kept parallel and unchanged, and the heat radiation of the heaters is directly used for baking the crucible, so that the heat transfer efficiency is greatly improved in comparison with that in a traditional method in which the crucible in the traditional single crystal furnace is constantly away from a heating zone; and a flow guiding cylinder is used for guiding argon gas to carry out enhanced heat exchange on the crystal, so that an convection vortex of the argon gas above the melt is inhibited, thus, impurities and micro-defects in the crystal are favorably reduced and the consumption level of the argon gas is decreased.
Owner:JIANGSU UNIV

Heat pipe and manufacturing method thereof

InactiveCN103994682AImprove heat transfer efficiencySolve the problem of insufficient heat dissipation capacity of high heat fluxIndirect heat exchangersHeat exchange apparatusWater basedThermal insulation
The invention discloses a heat pipe and a manufacturing method of the heat pipe. The heat pipe and the manufacturing method of the heat pipe can achieve cooling of electronic devices and a device. According to the heat pipe, a pipe shell is arranged on the outermost portion, a steam chamber is formed in the innermost portion, the steam chamber is divided into an evaporation segment, a thermal insulation segment and a condensation segment in the axial direction of the steam chamber, the thermal insulation segment is arranged in the middle, the evaporation segment and the condensation segment are arranged at the two ends respectively, a cylindrical capillary liquid absorption core layer formed by a multi-hole foamy copper liquid absorption core is closely attached to the inner wall of the pipe shell, holes in the multi-hole foamy copper liquid absorption core are different in hole diameter, a silk screen supporting frame is closely attached to the inner wall of the capillary liquid absorption core layer, the steam chamber is filled with a metal oxide water-based nanofluid working medium, the volume of the nanofluid working medium is 40% to 60% that of the evaporation segment, and metal oxide is aluminum oxide or copper oxide or silicon dioxide. According to the heat pipe and the manufacturing method of the heat pipe, nanofluid and multi-hole foamy copper are combined in the heat pipe, and the heat transfer efficiency of the heat pipe is improved.
Owner:JIANGSU UNIV OF SCI & TECH

Foam diamond reinforced paraffin phase change energy storage material and preparation method thereof

The invention relates to a foam diamond reinforced paraffin phase change energy storage material and a preparation method of the foam diamond reinforced paraffin phase change energy storage material. The phase change energy storage material comprises a surface reinforced foam framework, paraffin, a fire retardant and a paraffin support material; and a surface reinforcing layer of the foam framework is chosen from one of a diamond film, a graphene wall, a carbon nano tube wall, a graphene coated diamond film, a carbon nano tube coated diamond film, and a carbon nano tube/graphene coated diamond film. The phase change energy storage material is reasonable in structure, high in heat conductivity coefficient and stable in performance; and graphene or/and the carbon nano tube is/are modified on the surface, so that the heat conducting property of the foam framework is further improved, and the heat transfer efficiency of the existing energy storage material is effectively improved. The excellent chemical inertness of the diamond effectively avoids the corrosion of a metal framework in the phase change material, the prepared foam framework is not only suitable for the organic phase change energy storage material, is but also strongly compatible with and adaptive to the inorganic hydrous salt phase change material, and the phase change energy storage material is applied in the high-temperature high-power high-energy-consumption field.
Owner:CENT SOUTH UNIV

Simulated liquid absorbing core for heat uniformizing plate

The invention discloses a simulated liquid absorbing core for a heat uniformizing plate. The simulated liquid absorbing core is structurally characterized in that based on efficient transport structure of a plant leaf, a novel heat uniformizing plate in the simulated transport structure of the plant leaf is designed according to the point-to-surface transport principle of the plant leaf and the shortest path principle of transport. The heat uniformizing plate can be integrally designed with the liquid absorbing core, so that working medium can quickly enter a fractal passage under the action of capillary pressure, can quickly enter a polygonal microstructure tissue enclosed by the fractal passage and can reach the integral condensing surface of the heat uniformizing plate rapidly, and the working medium is quickly condensed into liquid state and can return to an evaporating end under the action of the capillary pressure, and one cycle is completed for preparation of the next evaporation. Meanwhile, due to the polygonal micropassage structure of a simulated vein structure, the liquid working medium is promoted to quickly flow to the periphery of a condensing end along the network passage of the liquid absorbing core, circulation of a working medium transport loop is accelerated, heat transfer efficiency is improved, and the simulated liquid absorbing core is small in size and applicable to precise electronic equipment.
Owner:SOUTH CHINA UNIV OF TECH

Uniform heating plate cooling device with support post structure and fabrication method of cooling device

The invention relates to a uniform heating plate cooling device with a support post structure and a fabrication method of the cooling device. The cooling device comprises a wind shielding plate, eddyfans and a uniform heating plate heat sink, wherein the uniform heating plate heat sink comprises a working cavity, a composite backflow structure, capillary structure support posts and a nanometer liquid-state working medium, the working cavity is formed by welding an upper cover plate and a lower cover plate, the upper cover plate is provided with rippled-shaped cooling fins, the lower cover plate is provided with heat conduction bosses, the composite backflow structure comprises upper cover plate grooves, a first silk-screen capillary liquid absorption core, lower cover plate grooves, a second silk-screen capillary liquid absorption core and support posts, the support posts are provided with capillary structures, and a plurality of through holes are formed in the first silk-screen capillary liquid absorption core and the second first silk-screen capillary liquid absorption core and are used for the support posts to penetrate through. By the support posts with the capillary structures, the backflow speed of the liquid-state working medium in the working cavity of the uniform heating plate and the heat transfer efficiency are improved, the structure strength is improved, the cooling device is applicable to an occasion where a single heat source and multiple heat sources are horizontally or vertically arranged, the application range of the uniform heat plate heat sink is expanded, and the cooling device has the characteristics of compact volume, high safety, high environmental adaptability and the like.
Owner:716TH RES INST OF CHINA SHIPBUILDING INDAL CORP

Wearable type flexible temperature-difference power generation structure with stretchable wire

The invention discloses a wearable type flexible temperature-difference power generation structure with a stretchable wire. The structure comprises a flexible thermal conductive silica gel cushion, a temperature-difference power generation layer, a thermal conductive patch and a metal cooling fin from the wearable surface to outside in sequence; the cold end plane and the hot end plane of the temperature-difference power generation layer are connected with the bottom surface of the thermal conductive patch and the upper surface of the flexible thermal conductive silica gel cushion respectively; and the upper surface of the thermal conductive patch is connected with the bottom surface of the metal cooling fin. When the wearable surface is adhered to non-planar human body skin, the stretchable wire and a polydimethylsiloxane package absorb deformation stress so as to avoid cracking of a bismuth telluride based thermoelectric arm with a poor mechanical performance and to avoid failure of electrode connection; the flexible thermal conductive silica gel cushion is packaged on one side of the hot end of the temperature-difference power generation layer, so that the tight contact with the skin of a user is ensured, and the heat transfer efficiency is improved; the cold end of each rigid temperature-difference power generation module is equipped with the independent thermal conductive patch and metal cooling fin, so that the structural thickness and quality are reduced and the temperature difference between the cold end and the hot end is increased; and in addition, the wearable type flexible temperature-difference power generation structure can be used for supplying power to wearable type medical apparatuses and has the value of popularization and application.
Owner:ZHEJIANG UNIV

Tube fin type heat exchanger of side positioned longitudinal whorl generator

The invention relates to a fin tube type heat exchanger of a side positioned longitudinal vortex generator. The fin tube type heat exchanger is provided with a plurality of groups of straight substrates which are mutually arranged at intervals of a certain spacing and mutually parallel and a plurality of heat exchanging tubes vertically penetrated through the straight substrates, and a triangle winglet shaped longitudinal vortex generator is arranged at the two sides of each heat exchanging tube. In the heat exchanger of the invention, a plurality of triangle winglets are arranged at the two sides of the heat exchanging tubes, to prompt that the longitudinal vortex is formed at the air side, and simultaneously, a speed passage is formed among the heat exchanging tube wall, the triangle winglets and the fin, to ensure that the boundary layer separation point at the position of the heat exchanging tubes wall is delayed, the wake zone at the back of the heat exchanging tubes is diminished, the boundary layer is attenuated, and the mixture of cool and hot fluids is improved, thereby the heat exchange is greatly enhanced and the resistance force is slightly increased. The fin tube type heat exchanger has the advantages that heat transfer efficiency is high, the structure is compact, the floor area occupation is small, thus to be suitable for large-scale mechanized production.
Owner:XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products