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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2020034568
pages 1337-1350

A CONJUGATE MODEL FOR BUBBLE GROWTH IN LOW-VELOCITY SUBCOOLED FLOWS

Maryam Medghalchi
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Canada, M5S3G8
Nasser Ashgriz
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada

RÉSUMÉ

A model for the growth of a bubble on a horizontal heated surface with a constant temperature and in a subcooled condition is presented. The model considers microlayer evaporation, transient thermal boundary layer conduction, and surface condensation or evaporation. The bubble growth time is divided into several stages, and the equation describing the bubble growth is simplified for different stages using a new characteristic time, and a new characteristic size. Several analytical solutions for the bubble growth are obtained at the early stages of the bubble growth and before the bubble lifts off. It is shown that before a critical time, the bubble growth is mainly governed by microlayer evaporation, however after the critical time the bubble growth is controlled by surface evaporation.

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