Thermal transport in a multiple jet impingement oven

Three-dimensional numerical simulation of flow field and heat transfer in a jet impingement oven with multiple jets was carried out. Distribution of local heat transfer coefficient on a model cookie in the oven cavity was obtained from the predicted flow and temperature fields, and compared with the experimentally measured values. Effects of air temperature (400, 450 K) and air velocity (2.5, 5, 10 m/s), on the surface heat transfer coefficient were studied. Numerical predictions showed good agreement with the experimental results. It was found that heat tran, fer coefficient was a strong function of air velocity while air temperature had no effect on. the heat transfer coefficient. Local heat transfer coefficient values ranged between 11 and 66 W/m(2) K whereas average heat transfer coefficient values ranged between 24 and 42 W/m(2)K. Results also showed that because of the presence of the suction, fan in the oven, flow field near the model cookie surface was quite different from that for a jet impinging on a flat surface.