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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Numerical Simulation of Pool Boiling from Artificial Cavities Using the Phase Field Method

Get access (open in a dialog) DOI: 10.1615/IHTC15.pbl.009284
pages 6001-6011

Sinopsis

A numerical model based on the phase field method is used to simulate saturated pool boiling of water from artificial cavities on a horizontal surface. Each cavity has entrapped vapor to begin with, which serves as the nucleus for boiling incipience. The sharp interface between two immiscible phases is replaced by a transition region of a small but finite width, across which the properties of the fluids are smoothly distributed. A phase field variable is introduced to identify the regions occupied by the two fluids. The dynamics of this phase field variable is governed by the Cahn – Hilliard equation. The continuity equation is modified to account for the phase change from liquid to vapor. The Navier-Stokes equations are modified to include the surface tension effects as a volumetric body force in terms of the phase field variable. The heat conduction equation is solved in the vapor phase only, as the liquid phase is at its saturation temperature. Pool boiling parameters like bubble departure diameter, bubble departure frequency, and heat flux corresponding to ONB are estimated through simulations in COMSOL and validated using theoretical correlations and experimental results from the literature.