Heat Transfer in the Microlayer Under a Bubble During Nucleate Boiling  

作　　者：David M.Christopher 张璐 

机构地区：[1]Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University

出　　处：《Tsinghua Science and Technology》2010年第4期404-413,共10页清华大学学报（自然科学版（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Nos. 50876050 and 50636030)

摘　　要：Many studies have shown that a very thin liquid microlayer forms under vapor bubbles during nucleate boiling. The heat transfer from the surface to the bubble is then significantly affected by this mi- crolayer and the curved region leading into the microlayer. Various models have been developed to predict the microlayer shape and the heat transfer along the curved interfacial region, but they tend to have incon- sistent boundary conditions or unrealistic results. This paper presents a theoretical model to predict the mi- crolayer thickness and the heat transfer rates for a variety of conditions. The results show how the wall su- perheat, the Hamaker constant, the bubble radius, and the accommodation coefficient at the interface affect the evaporation heat transfer rates and the microlayer shape for a large range of conditions for water and FC 72. The microlayer results are then shown to compare well with predictions made by solving the Na- vier-Stokes equations in the microlayer.Many studies have shown that a very thin liquid microlayer forms under vapor bubbles during nucleate boiling. The heat transfer from the surface to the bubble is then significantly affected by this mi- crolayer and the curved region leading into the microlayer. Various models have been developed to predict the microlayer shape and the heat transfer along the curved interfacial region, but they tend to have incon- sistent boundary conditions or unrealistic results. This paper presents a theoretical model to predict the mi- crolayer thickness and the heat transfer rates for a variety of conditions. The results show how the wall su- perheat, the Hamaker constant, the bubble radius, and the accommodation coefficient at the interface affect the evaporation heat transfer rates and the microlayer shape for a large range of conditions for water and FC 72. The microlayer results are then shown to compare well with predictions made by solving the Na- vier-Stokes equations in the microlayer.

关 键 词：nucleate boiling bubble growth heat transfer MICROLAYER 

分 类 号：TQ021.3[化学工程]