Optimization of spray parameters for effective microchannel cooling using surface response methodology

Abstract

Spray technology has numerous applications in general and cooling microchannels in particular. But before that study of the controlling parameters on which spray performance depends need to be explored. Present work describes an experimental study on microchannel cooling with jet and spray at different pressure combinations of air and water. The experimental facility was developed at the School of Mechanical Engineering, KIIT, deemed to be University, Bhubaneswar, to investigate the effect of various controlling parameters like fluid pressure, flow rate, nozzle to surface distance and heat input on jet and spray cooling of microchannels. The input parameters like air pressure and water pressure along with nozzle to surface distance were optimized. The input parametrs such as air and water pressure in the range of 1 bar to 3 bar, nozzle tip to surface distance in the range of 10 to 20 mm were considered during the tests. As a result, at 1 bar air pressure, 3 bar water pressure and 17.42 mm nozzle tip to surface distance, the maximum heat transfer coefficient was achieved as predicted optimal solution through response surface methodology (RSM). The data were compared with that of the earlier researcher's experimental work. The experimental results revealed that the employment of spray impingement cooling technique on microchannels provided significant improvement in removal of heat flux with less consumption of coolant.

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