Design And Performance Of Miniature Laminated Heat Exchanger With Porous Copper Fiber Sintered Felts

Heat exchanger is a device which convects the heat from one medium to another. As the development of integrated circuits, electronic components made higher requirements in small size and high cooling, which bring a great application foreground for the micro-heat exchanger which is small, hasing compact structure and high heat transfer efficiency. As the porous material has complex three-dimensional pore structure and the diversity of its framework, which make it has excellent performance in the heat transfer. In order to enhance the heat performance of heat exchanger, this paper designed a miniature laminated heat exchanger with porous copper fiber sintered felts and taken a systemic test for it.1. Fluid flow resistance and heat transfer enhancement theory of porous materialIn order to provide a theoretical reference for the porous copper fiber sintered felt design which was used in the miniature laminated heat exchanger and strong theoretical support for the test results'analysis, this paper reveals the factors which affect the flow resistance and heat transfer when the medium flow through the porous material by introducing the mechanism of the flow resistance and heat transfer of the medium flow through the porous material.2. Design of heat exchanger with porous copper fiber sintered feltAnalysis of heat exchanger's heat transfer process, countercurrent mode was chosen for the heat exchangers designed in order to obtain the best heat transfer performance. The thin copper fibers with different average diameter were obtained by the multi-tooth cutting method. The optimal manufacturing parameters were get in the relevant theory and experimental. And the porous copper fiber sintered felts which formed by the copper fibers which obtained by different manufacturing process, and their thickness and pore structure characteristics were analysed comparatively. The split feed milling method was adopted to manufacture the heat transfer plate in order to reduce or even eliminate the deformation of the thin copper plate.3. Performance test of heat exchanger with porous copper fiber sintered feltA high effective and easy operative test system was developed to test the heat transfer and resistance characteristic of the heat exchanger based on the Agilent Data Acquisition Instrument. The system was validated to be reliable through the uncertainty analysis. And the test system was used to test the heat exchanger which adopts porous copper fiber sintered felts which were different type or having different structure, or different types of heat transfer plate. The influence of different type of porous copper fiber sintered felts and heat transfer plate having different structure were emphatically analyzed. The test results also reflected the variational rule of the heat transfer pressure drop and the synthetical performance of the heat exchanger which adopts porous copper fiber sintered felt of different copper type,copper diameter,pore structure,thickness and heat transfer plate with different structure, when the fluid pass through the heat exchanger in different flow rates. And the results showed that:the heat exchanger which uses the heat transfer plate having the sub-acute triangle structure and porous copper fiber sintered felt which is fabricating by the copper fibers manufacturing by the multi-tooth cutting method had excellent performance.