Convective Thermal Transfer From a Heated Surface to an Impinging Multiphase Incompressible Turbulent Liquid Jet

The cooling process controlled by an impinging unsubmerged jet on a heated surface is tackled. Numerical studies about cooling by a two-phase incompressible turbulent flow have not been significantly treated in the literature and are considered here. The liquid jet cooling method is modelled by associating the energy equation with a multiphase incompressible turbulent flow model, the final objective being to be able to predict the heat transfer coefficient between the cooling liquid jet and the impinged surface. Turbulence is modelled by Large Eddy Simulation (LES). It is coupled with an Eulerian Volume of Fluid (VOF) method to follow the evolution of the interface between two fluids. In a first part, a work of validation is led and the model is compared to experimental results available in the literature [1]. Convective heat transfer induced by a planar jet of water impinging normally onto a flat heated surface is simulated. Knowing the imposed heat flux, local heat transfer coefficients are deduced from predicted surface temperatures. The next step will be to study cooling due to a cylindrical jet of water impinging onto a heated semi-hemispherical concave surface.