Numerical Study of Hydrodynamic and Heat Transfer Aspects of Orthogonal Water Jet Impingement on a Heated Surface with Different Flow Inlet Conditions

In present research work, heat transfer characteristics for orthogonal water jet impingement on flat heated surface, subject to constant heat flux is analysed. This work aims to examine heat transfer aspects and compare the numerical results obtained by the different turbulence models along with experimental results by Stevens and Webb- (nu) over bar (2) -f, k - omega SST and k - epsilon RNG models are compared with experimental results for the values of Nusselt number. Past research shows that k - epsilon SST turbulence model predicts the most accurate results for the case of air jet impingement. After comparing all the results, it is found that (nu) over bar (2) - f turbulence models is the best in agreement for orthogonal liquid jet impingement on a heated surface. After checking the validity of (nu) over bar (2) - f turbulence model for sharp edged orifice, same problem was simulated for water jet coming out from the hole (which is made on the periphery on the pipe in which water is flowing) and impinging on a heated plate. This geometry when kept vertical, represents the schematic of a proposed methodology to cool heated nuclear fuel rods in case of LOCA. The simulation was carried out for different mass flow rates. Results are compared for Guided and Non Guided pipe hole impingement with sharp edged orifice for same geometric and flow parameters.