Xu Qing,Li Yanzhong,Zhang Zhe
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:Two-phase flow distribution in the entrance of plate-fin heat exchangers was experimentally studied.It is found that gas Re and dryness are the main factors affecting two-phase flow distribution.A parameter of dimensionless velocity deviation is defined to describe maldistribution in two orthogonal directions.The results indicate that the liquid flow nonuniformity is more apparent than that of gas and the flow maldistribution in crosswise direction is more violent than that in the ordinate direction.The flow maldistribution of both gas and liquid components increase with the increase of gas flow Re. The gas flow maldistribution decreases with the inlet dryness increasing,but the liquid flow maldistribution increases simultaneously. It is also found that the liquid flow profile in the crosswise direction is strongly affected by the variation of gas flow Re and that in ordinate direction is mainly affected by the two-phase flow dryness．
Keywords:plate-fin heat exchanger;two-phase flow;flow distribution