摘要
设计加工一种带有入口节流结构的铜基微通道换热器,理论分析其传热模型、实验测量微通道换热器内相变换热的传热特性和压力特性。结果表明:换热器内部的热传递过程为其主要换热模式;换热器表面温度随加热热流密度的增大而增大;微通道入口流速对表面温度影响较小;入口工质过冷度线性影响换热器的表面温度。热流密度在不同阶段对换热系数有不同影响,热流密度为360 W/cm^2时,换热器换热系数出现最大值;换热器压降随热流密度和系统流速的增加而增大。
A microchannel heat exchanger with inlet orfice and copper was designed,manufactured and studied.Its heat transfer model was theoretically analyzed.The heat transfer characteristics and pressure drop under the phase transition condition in the microchannel heat exchanger were measured experimentally.The results show that the heat transfer process in the micro-channel heat exchanger can be divided into two different stages.The surface temperature of heat exchanger increases with increasing of the heat flux.The inlet velocity of microchannel has little effect on the surface temperature.The surface temperature of the heat exchanger is linearly influenced by the overcooling degree of working medium at the inlet.The dry degree of the outlet and the heat flux have different effects on the heat transfer coefficient at different stages.The maximum value of heat exchanger coefficient appears when the heat flux is 360 W/cm^2.The pressure drop of heat exchanger increases withr rising of heat flux and inlet velocity of microchannel.
作者
袁俊飞
王林
王占伟
张敏慧
Yuan Junfei;Wang Lin;Wang Zhanwei;Zhang Minhui(Institute of Refrigeration,Heat pump and Air conditioning,Henan University of Science and Technology,Luoyang 471023,China)
出处
《低温与超导》
CAS
北大核心
2019年第8期59-64,共6页
Cryogenics and Superconductivity
基金
国家自然科学基金项目(U1504524,51876055)
关键词
入口节流
微通道
相变换热
表面温度
压降
Inlet orfice
Microchannel
Phase transformation
Surface temperature
Pressure drop
