Experimental Investigation of Heat Transfer in Microchannel with Inlet Cavitation Structure  

作　　者：YUAN Junfei WANG Lin WANG Zhanwei TAN Yingying 

机构地区：[1]Institute of Refrigeration and Air Conditioning,Henan University of Science and Technology,Luoyang 471023,China

出　　处：《Journal of Thermal Science》2021年第1期294-301,共8页热科学学报（英文版）

基　　金：financially supported by the National Nature Science Foundation of China(Grant No.U1504524,No.51706061,No.51876055,and No.51806060)。

摘　　要：Heat transfer of R134 a through the microchannel with an inlet reentrant cavitation structure was investigated for high flux thermal management of electronic devices.The cavitating flow patterns,pressure,and heat transfer characteristics were studied in the range of effective heat fluxes from 0 to 138.4 W/cm2 with mass flow velocities from 2.12 to 5.23 m/s.A stable and ideal starting point of two phase flow and heat transfer was commendably provided by the inlet cavitation orifice.There existed an axis deviation liquid jet after the micro-orifice.The refrigeration vapor was generated from the cavitation structure but liquidized at the downstream of the channel.The wall temperature along flow orientation presented an opposite trend under the test states with or without heat input.The cavitation structure can significantly suppress the flow oscillation in microchannels and the outlet pressure fluctuation reduced about 72%compared with the fluctuation at the entrance.The heat transfer coefficient had been distinctly impacted by heat flux at lower heat input and then maintained the value nearly constant of 11.0 W/(cm^(2)·K)with the critical heat flux of 88.4 W/cm2.

关 键 词：heat transfer cavitation structure flow pattern pressure oscillation MICROCHANNEL 

分 类 号：TK124[动力工程及工程热物理—工程热物理]