On influence of selected parameters on the spatial distribution of the heat transfer coefficient for an array of air jets

Abstract

The paper deals with the reconstruction of the spatial distribution of the heat transfer coefficient (HTC). Jet impingement heat exchange is pursued by a hot air that flows through set of nozzles. High velocity gas is directed toward targeted surface and produces very high values of HTC. Due to limited operation range of a single jet an array of jets is analyzed. Retrieval of the heat transfer coefficient is pursued in two steps. The procedure starts with assuming of the functional form of temperature and heat flux at fluid–solid interface. Then the functional is parameterized. In second step the definition of the convective boundary condition is used to force the temporal invariability of HTC. The approximation coefficients are determined from a least square fit of the measured and computed temperatures. The study assesses the impact of the geometrical and flow parameters on the heat transfer coefficient produced by an array of jets.