Study On Heat Transfer Performance And Engineering Application Of Pulsating Heat Pipe Heat Exchanger

With the development of industry and technology, the safety and efficiency of the thermal equipments in the related industries and industries will face many new problems. On the one hand, with the increase of the degree of integration, the size of the electronic components is smaller and smaller, the heat load of the unit area is higher and higher, which makes the traditional heat dissipation way very difficult to meet the requirements. Therefore, the enhancement of heat transfer process and the new type of high efficiency heat transfer equipment are getting more and more attention.Pulsating heat pipe has the characteristics of small size, good heat transfer performance and so on. In this paper, the heat transfer performance of pulsating heat pipe was studied by means of experimental study on the heat transfer performance of the pulsating heat pipe, and the heat exchanger was designed and developed.In the visualization of experimental observation, the flow and flow pattern of different liquid filled rate pulsating heat pipe, and the growth and disappearance of air bubble were observed and analyzed. The conclusions are as follows:(1) The effect of filling rate on the normal start and operation of the pulsating heat pipe. The temperature is high, the oscillation amplitude is stable but the temperature is stable, but the temperature is lower, but it is not conducive to the formation of a cycle, which is not conducive to the formation of 19.7%. The pulsating heat pipe with 47.5% of the ratio of the oscillation amplitude and the starting temperature.(2) On the flow pattern, the flow is dominated by the plug flow when the pulse tube is heated and the temperature is lower, and when the pulse tube reaches the temperature, the plug flow will transfer to the annular flow, and the flow is dominated by annular flow.The experimental study of heat transfer performance of 20 "U"- shaped fin tube was designed, and the experimental device was built. The conclusions are as follows:(1) The thermal performance of the heat pipe is influenced by the thermal performance of the heat pipe. When the heat source temperature is 45, the optimal operating state is reached between 60 and 80.(2) The experimental results show that the heat transfer performance of the experimental device of the gas- liquid pulsating heat pipe heat transfer is excellent, and the equivalent heat conduction coefficient is far greater than that of the copper tube.Based on the experimental study of the heat transfer performance of the pulsating heat pipe heat exchanger, a gas liquid pulsating heat pipe with 80 U shaped fin tubes is designed and developed, and the design method, the design method, the design procedure and the related problems are described.