Author : D. A. Chavan and V. M. Kale

Enhancing performance of electronic components is causing in higher heat flux dissipation. Two phase passive devices are recognized solution for contemporary electronics thermal management. Closed loop Pulsating Heat Pipes (CLPHPs) have emerged as alternative to conventional heat transfer technologies. The aim of research work presented in this paper is to better understanding working mechanics and effect of operating parameters on performance of CLPHPs through experimental investigation. Experiments were conducted on a CLPHP made up of copper capillary tube of 1.78mm ID & 3mm OD, the lengths of the evaporator, adiabatic and condenser sections are 100mm, 100mm and 150mm respectively. Afterwards effects of various parameters, including working fluids (Ethanol, Methanol and DI Water), the volumetric filling ratios (40%, 50%, 60% and 70%) and orientation (Vertical, Inclined at 45o with horizontal and horizontal) on thermal performance of the CLPHP investigate experimentally. The results shows that each fluids has its own optimum filling ratios for given geometry and performance is highly affected by variation of volumetric filling ratios. The results strongly demonstrate the effect of working fluids and volumetric filling ratios on the thermal performance of device. Significant insight into the operational regimes of the CLPHP has been gained.

Keywords: Closed Loop Pulsating Heat Pipe, Working Fluids, Volumetric filling ratio, Latent heat, Thermal resistance