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A simple hydrodynamic model for transition boiling

Published online by Cambridge University Press:  10 January 2000

SANG W. JOO ,
STEPHEN H. DAVIS  and
S. GEORGE BANKOFF
SANG W. JOO
Affiliation:
Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, IL 60208, USA Permanent address: School of Mechanical Engineering, Yeungnam University, Gyongsan 712-749 Korea.
STEPHEN H. DAVIS
Affiliation:
Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, IL 60208, USA
S. GEORGE BANKOFF
Affiliation:
Department of Chemical Engineering, Northwestern University, Evanston, IL 60208, USA
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Abstract

A vertical column of an inviscid fluid, heated uniformly from below through a horizontal rigid bottom, is studied, with focus on the dynamics of the vapour/liquid interface near the three-phase (contact) line. The interfacial motion is induced by the competing effects of liquid feeding from above and evaporative mass loss through the interface. A linearized solution is obtained that describes the location of the contact line. The solution is used to study the transition processes to and from film boiling, where part of the liquid, lying on top of a vapour layer, can spontaneously be drawn downward and touch the heated bottom. Recession or advancement of the contact line then determines whether the film boiling is sustained or broken. It is seen that the correct contact-line dynamics cannot be predicted solely from a global mass balance in the liquid column.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 402 , 10 January 2000 , pp. 195 - 210
Copyright
© 2000 Cambridge University Press

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