Experimental study on Thermal Performance of Vertical Pulsing Heat Pipe

Abstract

Thermal control is an important topic for thermal management of small electrical and electronic devices. Closed loop pulsating heat pipe (CLPHP) is emerging as the best solution for thermal control. The aim of this experimental study is to search a CLPHP of better thermal performance for cooling different electrical and electronic devices. In this experiment, (50%methanol+50%ethanol), acetone and distilled water have been used as working fluid. The effect of using (50%methanol+50%ethanol) acetone and distilled water as working fluids is studied on thermal performance in different filling ratios. A copper capillary tube has been used having the inner diameter of 2.0mm, outer diameter of 4.0mm and length of 130mm. The CLPHP has 3 loops where length of the evaporation section is 30mm, adiabatic section is 40mm and condensation section is 60mm. The experiment is done using FR of 0% ,30%, 50% with 70% of interval varying heat input from 6 watt to 35 watt. The results are compared on the basis of evaporator temperature, condenser temperature and their differences, thermal resistance, effect of filling ratios. The results demonstrate (50%methanol+50%ethanol) as the most suitable working fluid at 70% filling ratio. Because, (50%methanol+50%ethanol) at 70% filling ratio