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Dynamics of a thin liquid film under shearing force and thermal influences

摘要:Study of liquid film dynamics promotes understanding the critical heat flux (CHF) of boiling heat transfer, which occurs as the liquid layers (micro-layer and macro-layer) near the heater wall lose their integrity. Since the measurement at micro-scale is a challenge, and further complicated by the chaotic nature of the boiling process, profound knowledge on the thin liquid film dynamics is not well documented in the existing literature. In the present paper, we employ a confocal optical sensor system to study the dynamics and the integrity of a thin liquid film sheared by the co-flowing air from above and heated from below in a horizontal aluminum channel. The results indicate that the entrainment governs the liquid film thinning process under adiabatic or lower heat flux conditions, whereas the evaporation becomes more pronounced in a higher heat flux system. The detailed evolution of liquid film is discussed. Based on our experimental observations, the critical film thickness of an integral film is related to the condition of the heating surface and the heat flux. For a specific surface, the critical film thickness remains constant under a defined heat flux and increases with the increasing heat flux. A spectrum analysis is also implemented to analyze the film instability. It is concluded that the heat flux is the dominant factor to govern the film instability compared with the effect of differential velocities of gas and liquid flow. (C) 2017 Elsevier Inc. All rights reserved.

关键字:Stratified flow Liquid film dynamics Instability Film rupture Shear force

ISSN号:0894-1777

卷、期、页:卷: 85 页: 279-286

发表日期:2017-07-01

影响因子:2.830000

期刊分区(SCI为中科院分区):三区

收录情况:SCIE(科学引文索引网络版),ESI(基本科学指标数据库),EI(工程索引)

发表期刊名称:EXPERIMENTAL THERMAL AND FLUID SCIENCE

参与作者:Zhang, Youjia,Gong, Shengjie,Bai, Bofeng,Ma, Weimin

第一作者:王科

论文类型:期刊论文

论文概要:王科,Zhang, Youjia,Gong, Shengjie,Bai, Bofeng,Ma, Weimin,Dynamics of a thin liquid film under shearing force and thermal influences,EXPERIMENTAL THERMAL AND FLUID SCIENCE,2017,卷: 85 页: 279-286

论文题目:Dynamics of a thin liquid film under shearing force and thermal influences

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