Bubble Dynamics and Nucleate Pool Boiling Heat Transfer - Numerical Simulations and Experimental Validation

摘要

Results from numerical simulation and experimental validation of the growth and departure of single and multiple merging bubbles and the associated heat transfer on a horizontal heated surface during pool nucleate boiling under low and earth normal gravity conditions have been reviewed here. A finite difference scheme was used to solve the equations governing mass, momentum and energy in the vapor and liquid phases. The vapor-liquid interface is captured by a level set function while including the influence of phase change at the liquid-vapor interface Water and PF5060 were used as test liquids. The effects of gravity levels, contact angle, liquid subcooling and wall superheat on the bubble diameter, interfacial structure, bubble merger time, departure time and local heat fluxes are reported. A scheme to calculate the wall heat flux for a large surface is also introduced.