Experimental Analysis of Closed Loop Pulsating Heat Pipe with Different Working Fluids at Different Inclinations

N. Santhi Sree, N.V.V.S. Sudheer and P. Bhramara

Due to the increasing power and decreasing size, nowadays microelectronic devices are in high demand on their thermal management systems. Pulsating heat pipe is a Wickless heat pipe. It is one of the main category of heat pipeswith both the ends closed. PHP s are the one of the best suggested solution for the cooling of microelectronic application. Due to its construction features it has relatively low cost and an ability to accommodate higher heat flux rates. In the present study, an 8 –turn PHP was constructed with its capillary dimensions such as 2.0 mm inner diameter made up of copper tubing. The PHP was operated under different inclinations with 50% fill ratio. Different working fluids viz-water, acetone, ethanol and methanol are used. Different angles 0,45and 90 degree inclinations are used for experimentation. To induce pulsation in different orientations more power was required. In the orientation of 0-degrees until a heat input of 20 W, pulsation did not occur. Upon start up, thermal resistance slightly decreases. At high heat fluxes, under steady state operation all the fluids fall into least thermal resistance values. Among all the fluids acetone shows least thermal resistance at all inclinations positions whereas water shows higher values.

Volume 11 | Issue 8

Pages: 13-19