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A level-set method for analysis of microdroplet evaporation on a heated surface
손기헌 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.4
A level-set method is presented for computing microdroplet evaporation on a heated surface. The formulation based on a sharpinterface representation for incompressible two-phase flow is extended to include the effect of evaporation by employing a calculation procedure for the coupled interface conditions for the temperature and mass fraction. A dynamic contact angle model is also incorporated into the level-set method to account for the change between advancing and receding contact angles at the liquid-gas-solid interline. The numerical method is applied to analyze the effect of wall temperature, contact angle and droplet size on the microdroplet motion.
손기헌,Son, Gi-Hun 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2
Numerical analysis of bubble motion during nucleate boiling is performed by imposing a constant heat flux condition at the base of a heater which occurs in most of boiling experiments. The temporal and spatial variation of a solid surface temperature associated with the bubble growth and departure is investigated by solving a conjugate problem involving conduction in the solid. The vapor-liquid interface is tracked by a level set method which is modified to include the effects of phase change at the interface, contact angle at the wall and evaporative heat flux in a thin liquid micro-layer. Based on the numerical results, the bubble growth pattern and its interaction with the heating solid are discussed. Also, the effect of heating condition on the bubble growth under a micro-gravity condition is investigated.