【作者】 韩圆圆； 王丹华； 邱燕； 冷学礼； 张冠敏； 田茂诚；

【Author】 HAN Yuan-yuan;WANG Dan-hua;QIU Yan;LENG Xue-li;ZHANG Guan-min;TIAN Mao-cheng;School of Energy and Power Engineering;

【机构】 山东大学能源与动力工程学院；

【摘要】 板翅式换热器入口段各流道间流量分配不均会导致换热器换热效率低下,特别是两相流体,其分配不均匀问题更加严重。构建并联管路中母管与支管及其连接换热器的入口部分的三维物理模型,采用MIXTURE方法对135K条件下的甲烷气液两相流体在管路中的均布情况进行数值模拟研究。分析两相流体在支管中与换热器入口部分流道间的流量分配不均与流体入口速度与液滴粒径的对应关系。研究发现:气液入口速度一致时,在母管进入支管时会产生气液分离,随着液滴粒径或入口速度的增大,气液分离程度也不断增大,这会直接导致支管内的气液分布不均,进而影响换热器各流道间的气液分布。更多还原

【Abstract】 The uniformity of entrance flow field has influence on the heat transfer efficiency of plate-fin heat exchanger.It will get worse in two-phase flow.Three-dimensional physical model for branch pipe and entrance of heat exchanger were presented.Study on flow field distribution using the MIXTURE method under the same inlet velocity and different droplet size.The study shows that at same inlet velocity,it will happen a relative slide between gas and liquid when enter the side arm.And it is getting worse as the droplet size or inlet-velocity increasing.It is mainly due to the uneven distribution of gas-liquid.The distribution of gas and liquid in branch pipe has a direct effect on flow distribution in heat exchanger channels.更多还原