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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Imprimir: 0276-1459
ISSN On-line: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v12.i3-4.120
20 pages

NUMERICAL SIMULATION OF BUBBLE GROWTH IN NUCLEATE BOILING - EFFECTS OF SYSTEM PARAMETER

Qiang Bai
Department of Mechanical Engineering, Kyushu University, Hakozaki 6-10-1, Fukuoka, 812-8581, Japan
Yasunobu Fujita
Department of Mechanical Engineering, Kyushu University, Hakozaki 6-10-1, Fukuoka, 812-8581, Japan

RESUMO

A numerical simulation scheme was developed in this paper to analyze the bubble growth process in nucleate boiling. A single bubble was assumed to grow axisymmetrically on an isothermal wall with heat being supplied through the microlayer beneath the growing bubble and from the superheated liquid outside the bubble cap. In the simulation no assumption was made on the bubble shape during its growth. Stephan and Hammer model was used for the evaporation in the micro-region beneath the bubble. In the macro-region around the bubble cap, transient Navier-Stokes and energy equations were solved using a two-dimensional arbitrary Lagrangian-Eulerian finite element method (ALE-FEM) based on quadrilateral elements. Numerical calculation was carried out in nucleate boiling under saturated, subcooled, terrestrial- and reduced-gravity conditions. The present simulation scheme offers a useful means to consistently investigate the growth process of an isolated vapor bubble in various conditions with a minimum number of assumptions and simplifications. It enables to describe quantitatively the flow and temperature fields around the growing bubble from the inception through departure to subsequent rising in stagnant fluid.


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