中文摘要：

在一个大气压下以水为工质研究了竖直矩形窄流道内过冷沸腾的汽泡生长特性。采用Laplace数（La）和时间因子（ξ）无量纲化汽泡半径和汽泡生长时间,得到了不同工况下的无量纲汽泡生长曲线。通过分析质量流速和热流密度变化对无量纲汽泡生长的影响,发现增加质量流速会抑制汽泡生长;增加热流密度则会促进汽泡生长。汽泡的生长行为会严重影响核态沸腾换热系数hNB,从而影响总沸腾两相流动换热系数htp。采用与雷诺数（Re）相关的无量纲时间（t＊）的1/3次方模型来预测无量纲汽泡生长,发现此模型能较好地预测本研究中所得到的无量纲汽泡生长数据。

英文摘要：

The nature of bubble growth in vertical rectangular narrow channel at atmospheric pressure was conducted using water as working fluid in present study.Laplace number（La） and non-dimensional time factor（ξ） are used in present paper for non-dimensionalization of bubble radius and bubble growth time,respectively.By analyzing the effects of mass flux and heat flux on dimensionless bubble growth,the authors found that the bubble growth could be restrained with increasing mass flux,but accelerated with increasing heat flux.The authors also found that the bubble growth could affect the nucleate boiling heat transfer coefficient,hNB,strongly,thereby,make big contribution to total heat transfer coefficient of tow phase boiling flow,htp.A non-dimensional bubble growth model with Reynolds number（Re） and non-dimensional time,t＊1/3,is proposed in present study,and this model can predict the non-dimensional bubble growth well.