Heat Transfer and Bubble Dynamics during Coalescence in Subcooled Nucleate Pool Boiling

摘要：

Subcooled nucleate pool boiling experiments were performed using constant wall temperature boundary conditions while the wall heat flux was measured at a various locations to study how the coalescence affects the heat transfer and the bubble dynamics during and after coalescence. The experiments show the effect of the subcooling on the coalesced bubble shape, size and departure time. The coalesced bubble moves and oscillates on the heater surface with significant heat transfer variations prior to departure. The coalesced or departure bubble size and departure frequency decreased as the subcooling was increased. The heat flux for boiling with coalescence fluctuated much more than for single bubble boiling due to the vaporization of the liquid layer trapped between the bubbles. In some cases, many additional small bubbles nucleated very near and rapidly coalesced with the initial bubble which enhanced the overall heat transfer.

关键词： micro heater array bubble dynamics bubble coalescence heat transfer

作者: Abdoulaye Coulibaly Xipeng Lin Jingliang Bi David M. Christopher

作者单位: Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering,Tsinghua University Beijing 100084, China

会议类型: 国际会议

会议名称: 4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)

会议地点: 广州

会议语种:英文

页码: 1-5

在线出版日期: 2012-01-06（万方平台首次上网日期，不代表论文的发表时间）