Abstract
Coupled momentum and heat transfers have been numerically studied in a non-confined, axisymmetrical, laminar, and initially cold jet impinging on a flat substrate heated at high temperature. Variable physical properties were taken into account. The flow field as well as the local heat transfer rate was studied as a function of various parameters such as Reynolds and Froude numbers, nozzle-substrate distance, substrate temperature, and jet directions (upwards, downwards). The calculated flow field as well as the local Nusselt number are in good accordance with the experimental data from the literature at low temperature difference between the gas and the substrate. The numerical solution describes satisfactorily the non-monotonous experimental radial variation of the Nusselt number at small nozzle substrate distance.
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