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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Bubble Dynamics and Heat Transfer during Bubble Growth in Nucleate Boiling

Get access (open in a dialog) DOI: 10.1615/IHTC12.2390
6 pages

Sinopsis

A three-dimensional code was developed to simulate the bubble growth and coalescence in the vertical and horizontal directions in nucleate boiling. The level set method is used to capture the liquid-vapor interface so that the present code can easily handle complex topology changes such as break-up and coalescence of bubbles. The calculation domain is divided into the macro- and micro-regions. In the macro-region, three conservation equations for vapor phase inside bubbles and liquid phase surrounding the bubbles are simultaneously solved to determine the velocity and temperature fields. In the micro-region under the growing bubble, lubrication theory is used, in which the disjoining pressure in the thin liquid film is taken into account. Simulation results by the present algorithm quantitatively show that bubble coalescence substantially influences the flow and heat transfer around bubbles. Simulated patterns of bubble coalescence in the vertical and horizontal directions are qualitatively in good agreement with observations in many boiling experiments.