Abstract
The effect of a distance between a nozzle and hot plate on flow and heat transfer characteristics was investigated numerically for an array of submerged air microjets. The considered numerical model consisted of 16 microjets, arranged in the regular array of 4×4. The compressible steady state air flow, including turbulent effects, was model applying the SST k-ω turbulence model. The numerical simulator was developed in the ANSYS Workbench environment. During analyses the jet diameter-based Reynolds number and the jet pitch to the jet diameter ratio were equal to Red = 1100 and s/d = 31.25, respectively, while the ratio of the distance between the nozzle and hot plate to the jet diameter was set to H/d = 3.125, 25 and 50. In terms of heat transfer, the best distance-to-jet diameter ratio was found to be H/d = 25. Decrease of this ratio below and increase above 25 resulted in more non-uniform and uniform, respectively, distributions of temperature and heat transfer coefficient on the hot surface as well as in drop in the cooling performance. The obtained average temperatures and heat transfer coefficients on hot plate were equal to 332.4, 315.5 and 318.7 K as well as 160, 274 and 239 W/m2/K for H/d = 3.125, 25 and 50, respectively. The effect of lateral flow on adjacent jets and heat transfer rate was also observed and increased with rise in the H/d ratio.
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