Abstract

The present study discusses two equilaterally staggered jet arrangements for uniform cooling of flat surface. The equilateral staggered arrangement consists of a circular jet surrounded by four neighboring chamfered jets at an angle of 45° called as chamfered configuration. An equilateral staggered jet arrangement consisting only of circular jets is considered as the non-chamfered configuration. Large-eddy simulations and Mie-scattering imaging techniques are discussed for heat transfer and flow visualization of equilateral staggered jet configurations. Formation of number of eddies characterizes the flow feature. The turbulence quantities of the jet configurations determine the amount of heat transfer. The eddies are formed due to recirculation which later breaks into smaller parts by the incoming jet fluid. The flow features basically constitute of jet to jet interaction, jet interference and upwash flow. It is also noticed that every jet cools an independent area. However with the inclusion of chamfered jets the region of highest heat transfer shifts away from the jet centerline. This happens because of change in direction of flow of jet due to chamfering. The heat transfer results are discussed in terms of Nusselt number and temperature contours. A maximum variation of 22.8% in average Nusselt number is obtained between both the configurations while varying the gap ratios between 3 to 7. An increase of jet-to-jet spacing ratio from 2 to 7 shows improvement in heat transfer by 15.1% and 13.2% for non-chamfered and chamfered configurations respectively.

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