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Wicking Grooves to Enhance Heat Transfer Coefficients in Spray Cooling

Fluid droplet interaction/dynamics on modified surfaces is very pertinent in understanding the heat transfer mechanism associated with evaporative cooling of such surfaces. In the present paper, wicking grooves experimentation in enhancing Heat Transfer Coefficients (HTC) in spray cooling is carried out. Cross and unidirectional grooves were studied to determine the capillary wicking phenomenon and fluid spreading on such surfaces. The Bond number was determined as the main parameter that controls the wicking phenomenon on such modified surfaces. Whereas cross grooves would have been preferred for fluid flow in both directions, the cross grooves were observed to decrease capillary wicking due to multi-directional flow. Higher fluid coverage and capillary velocity (tip velocity) have been observed for the unidirectional grooves. A lower superheat temperature difference of about 15 o C at heat flux 25 W/cm 2 differential was obtained when the grooved surface were compared to a smooth surface. Maximum heat transfer coefficient enhancement of about 8500 W/m 2 -K was obtained for the wicking surface compared to the smooth surface.