In this work, a theoretical model has been formulated and a numerical code has been developed to analyze the cooling effect induced by liquid droplets during single-phase evaporation and nucleate boiling regime on high temperature solid surfaces.The model is based on a numerical integration of the energy and mass conservation equations in the solid and the liquid domain. In terms of geometry discretization, a cylindrical coordinate system is used, and the differential equations are modeled on an axis-aligned half plane. Evaporation of liquid is reproduced at either the solid-liquid or the liquid-air interfaces.The non-linear system of partial differential equations is discretized using an iterative, second-order in time and space, semi-implicit scheme. A fast sparse solver is used to obtain energy and mass variations with respect to time. Experimental results are finally employed to tune and validate the model.
Theoretical and Numerical Study on Dropwise Cooling under Nucleate Boiling Conditions / C., Bussi; Muscio, Alberto; Tartarini, Paolo. - STAMPA. - (2003), pp. 173-178. (Intervento presentato al convegno XXI Congresso Nazionale UIT sulla Trasmissione del Calore tenutosi a Udine nel 23-25 Giugno 2003).