摘要
采用微通道蒸发器二维模型,研究不同R134a入口雷诺数下,其在蒸发器内的流动及流量分配特性。模拟与实验结果最大误差小于23.8%,验证了模型的可靠性。结果表明,随着雷诺数的增大,蒸发器底部扁管入口速度近似线性增加,扁管低压区从蒸发器中间扁管逐渐上移,压降不断增加,降幅最高可达71%。
A two-dimensional model of microchannel evaporator was used to study the flow and flow distribution characteristics of R134 a with different inlet Reno number. The maximum error between simulation and experiment is less than 23.8%, which verifies the reliability of the model. The results show that with the increase of Reno number, the inlet velocity of the bottom flat tube increases approximately linearly, the low pressure zone of the flat tube moves up gradually from the middle flat tube of the evaporator, and the pressure drop increases continuously, the drop degree can be as high as 71%.
作者
许耿
陈华
段鼎立
刘剑
Xu Geng;Chen Hua;Duan Dingli;Liu Jian(Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China)
出处
《低温与超导》
CAS
北大核心
2021年第1期66-72,85,共8页
Cryogenics and Superconductivity
基金
天津市自然科学基金项目(18JCYBJC90300)资助。
关键词
微通道
数值模拟
流量分配
Microchannels
Numerical simulation
Flow distribution
