Paper Title
Measurement of Capillary Wicking Height for The Packed Bed of Nanoparticles

Abstract
Capillary wicking of porous material can be used to distribute liquid coolant to entire surface of high-power-density electric devices such as inverter and battery of electric vehicles. Since the capillary force tends to increase with a decrease in the pore size of the porous material, it is expected that the packed bed of nanoparticles can be used as a high-performance distributor of liquid coolant if it is arranged on the surface of heating element. In view of this, the capillary wicking height was measured for several packed beds of nanoparticles in this work. To apply this technique to the heat removal from electronic devices, the electric insulation liquid (3M Fluorinert FC-77) was used as the test liquid. The maximum capillary wicking height achieved in this work was 37 mm and approximately 1.5 times higher than the typical value for ordinary porous metal plate. It was also shown that the capillary wicking height tends to increase with an increase in the number density of the nanoparticles in the packed bed whilst the effect of the size of nanoparticles is not noticeable. Keywords - Capillary Wicking Height, Packed Bed, Nanoparticle, Cooling of Electronic Devices.