摘要
采用数值模拟软件CFX对R134a在当量直径为0.6 mm的微通道中沸腾换热两相流特性进行了数值模拟分析。研究了质量流速、热流密度、干度对沸腾换热的影响。结果表明:沸腾换热会导致管内压力降低,使得蒸发温度,换热系数随着质量流速的增大而增大。换热系数的峰值随热流密度的增大和质量流速的减小向干度较大的方向偏移。
Numerical simulation of flow boiling heat transfer characteristics of R134a in micro-channel with equivalent diameter of 0.6 mm was carried by CFX software, and the influence of mass flow rate, heat flux density, dry degree to boiling heat transfer was studied. The results show that the boiling heat transfer can reduce pressure and make the evaporation temperature, and the heat transfer coefficient increases with the increase of mass velocity, and the peak value deviates to the direction of large dry degree with the heat flux increase and the quality of velocity decrease.
出处
《建筑热能通风空调》
2016年第10期1-4,50,共5页
Building Energy & Environment
基金
国家自然科学青年基金(No.51306040)
关键词
微通道
两相流
换热特性
micro channel
two phase flow
heat transfer characteristics
