摘要
微通道蒸发器内制冷剂流量分配均匀性对换热器性能有着较大影响。本文在理想工况运行情况前提下,以水为流动工质,数值模拟了微通道蒸发器内流量分配特性,探讨了4种集流管形式(A型、B型、C型、D型)、不同入口速度(0.08 m/s^0.42 m/s)对换热器各扁管流量分配的影响。研究结果表明,集流管入口流速对换热器内各扁管流量分配具有较大影响,当速度从0.08 m/s增大到0.42 m/s时,换热器内流量分布从两侧高,中间低的分布转变为入口侧低,出口侧高的分布特性,且流量分配不均匀度随流速增加而显著增大;通过改变集流管结构能够在一定程度上改善流量分配特性。各扁管进口静压力分布与各扁管内流量分配具有相关性,可通过改进集流管结构保证静压力分布一致,使各扁管流量分配均匀,从而获得较好的换热性能。
The refrigerant flow distribution behavior has significant effect on the heat transfer performance in micro-scale evaporator. Considering the ideal operating conditions, the flow distribution characteristic of pure water in microchannel evaporator is simulated.And the effect of header pipe structures （Type A？D） and different inlet velocity （0.08 m/s？0.42 m/s） on flow distribution are discussed. The investigation shows that the inlet veloci-ty of header pipe has significant influence on the flow distribution. With the velocity in-creasing from 0.08m/s to 0.42 m/s,the phenomenon of flow distribution is change from high in both sides and low in middle to low in inlet and high in outlet. Meanwhile,the flow heterogeneity increase dramatically with increasing inlet velocity. However,the dis-tribution behavior can be improved from changing the header pipe structure. The results also show that the pressure distribution has effect on the flow in each microchannel. Better heat transfer characteristic can be obtained by maintaining the homogeneous pressure dis-tribution in header pipe.
作者
池帮杰
代苏苏
鲁进利
韩亚芳
Chi Bangjie;Dai Susu;Lu Jinli;Han Yafang(School of Civil Engineering and Architecture, Anhui University of Technolog)
出处
《制冷与空调》
2018年第4期34-39,共6页
Refrigeration and Air-Conditioning
基金
国家自然科学基金资助项目(51306002)
安徽省自然科学基金资助项目(1508085QE95)
关键词
微通道蒸发器
静压分布
流量分配特性
集流管
microchannel heat exchanger
static pressure distribution
flow distribution behavior
header pipe
