An Experimental Investigation of Methanol Closed Loop Pulsating Heat Pipe at Variable Water Bath Temperature

The objective of this paper is to investigate the closed loop pulsating heat pipe with Methanol as working fluid. Working fluid is very important factor that significantly influence the thermal performance of closed loop pulsating heat pipe. The working fluids which are usually available are methane, ethane, pentane, acetone, methanol, and ethanol. This paper investigates closed loop pulsating heat pipe with methanol as working fluid. Compatibility of working fluid with heat pipe material is also the important factor hence copper is selected as compatible material for methanol heat pipe. Filling ratio of working fluid is also the important factor that significantly influence on the thermal performance of closed loop pulsating heat pipe. The filling ratio of 30 to 75 % provides the best result. Here in this paper the filling ratio of 60 % has been selected for methanol.