In this work, a thermal lattice Boltzmann model is applied to simulate thermal behavior of a droplet on the solid surface. For this reason Lee’s model which uses the Cahn-Hilliard diffuse interface theory, is utilized to capture the droplet dynamics. Contact angle between solid, liquid and gas phases has been considered in simulations. To take into account thermal effects, passive scalar model is merged with the Lee’s method. Since in passive scalar modelthe solution of temperature field is independent of flow field, the Boussinesq approximation is used to couple them. Numerical results for two thermal boundary conditions; constant wall temperature and constant heat flux on the wall, are presented. For the case of validity, results have been compared with previous numerical results. Results show that by increasing the Prandtl number ratio between droplet and its surrounding, thermal diffusion within the droplet will be delayed and this causes reduction in the droplet average temperature. Also it was shown that the wall heat flux is concentrated around the droplet, while that in the gas phase is negligible.
کلید واژگان :Two phase flow, Droplet impinging, Thermal behavior, Solid surface, Lattice Boltzmann Method 1. Introduction
ارزش ریالی : 600000 ریال
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