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《Chinese Journal of Nuclear Science and Engineering》 2010-01
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An experimental investigation of bubble growth and effects on heat transfer in water subcooled flow boiling in a vertical narrow rectangular channel

CHEN De-qi 1,PAN Liang-ming 1,YUAN De-wen 1,WANG Xiao-jun 2(1.School of Power Engineering,Chongqing University,Chongqing of Sichuan Prov.400044,China;2.Institute of Nuclear Power of China,Chengdu of Sichuan Prov.610041,China)  
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.
【Fund】: 国家自然科学基金(50406012);; 中国核动力研究设计院空泡物理和自然循环重点实验室2008年基金资助项目(9140C7101020802)
【CateGory Index】: TL331
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