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A comprehensive model predicting the deformation, growth and detachment of a vapour bubble in the nucleate boiling regime with an applied electric field is described in this paper. The model takes into account the full electrohydrodynamics of the phenomenon including the influence of local temperature on the generation of free charges in the liquid. Solution of the model by the level set method has been successfully implemented with a commercial CFD code. Aspects of the code and the graphical software requiring further development are noted. Sample results are presented to demonstrate the effect of the electric field on the growth and detachment of the bubble, for a bubble initially protruding through a thermal boundary layer on a horizontal wall. The bubble is elongated under the influence of electrical forces, the effect being more pronounced for stronger electrical fields. The electric field is found to promote earlier detachment of the bubble at a smaller volume, thus increasing the bubble frequency. The wall heat flux during the process of detachment is not much affected by the electric field. . Nomenclature P c specific heat at constant pressure, K kg / J E electric field strength, m V / g gravitational vector, 2 / s m H Heaviside step function h grid spacing fg h latent heat of evaporation, kg J / J electric current density, 2 / m A k thermal conductivity, K m W / m mass flux vector , s m kg 2 / mic m evaporation rate from the microlayer, s kg / p pressure, 2 / m N q wall heat flux, 2 / m W r coordination, m R radius of computational domain, m o R radius of dry region beneath a bubble, m 1 R radial location of the interface at 2 / h y , m t time, s T temperature, K sat w sat T T T wall superheat, K u -velocity vector v u, u r-directional velocity, s m / v y-directional velocity, s m / V bubble volume, 3 m c V control volume, 3 m y vertical coordinate, m Y height of computational domain, m

MODELLING OF THE GROWTH AND DETACHMENT OF A VAPOUR BUBBLE AND THE EFFECT OF AN ELECTRIC FIELD IN THE NUCLEATE BOILING REGIME