Mass transfer behavior at bubble surface during nucleate boiling

被引：0

作者：

Li Z.M. ^{[1
]}

Peng X.F. ^{[1
]}

Lee D.J. ^{[2
]}

Liu T. ^{[3
]}

机构：

[1] Thermal Engineering Department, Tsinghua University

[2] Department of Chemical Engineering, National Taiwan University

[3] Department of Power Engineering, Beijing University of Aeronautics and Aerospace

来源：

Heat and Mass Transfer | 2002年 / 38卷 / 4期

关键词：

Bubble Growth; Bubble Surface; High Heat Transfer; Positional Dependence; Interfacial Vapor;

D O I：

10.1007/s002310100253

中图分类号：

学科分类号：

摘要：

Interfacial mass transfer mechanisms played an essential role to the high heat transfer efficiency noted for nucleate boiling. There existed a zone around the bubble surface that exhibited zero net mass flux, termed herein as the "zero-flux zone". This work investigated analytically the interfacial vaporization and condensation processes around a boiling bubble, based on which the positional dependence of zero-flux zone was derived. For a stationary bubble the zero-flux zone shifted to the upper hemisphere with decreasing wall superheat and/or with increasing contact angle. Moreover, the bubble growth (shrinkage) largely enhanced (retarded) such a trend. At the extreme condition where the bubble grew at a very fast speed the entire bubble surface would be subject to liquid evaporation only. Experiments observed a "thermal jet" emerging from the bubble cap, which was attributed to the interfacial vapor condensation flux at the bubble cap.

引用

页码：433 / 439

页数：6

共 12 条

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