Experimental Study of Close Loop Pulsating Heat Pipe Using Thermic Fluid(HP-Hytherm-500)

The main purpose of this study is to investigate the influence of the use of thermicfluids on two-phase heat transfer, particularly on the thermal performance of the heat pipes. In the first stage, the properties of the thermicfluids were studied, then, these thermicfluids were used as the working fluids of the heat pipes. The thermal performance of the heat pipes when using different fluids was investigated under different operating conditions experimentally and analytically. This research investigate the effect of pure water and thermicfluid on thermal resistance of closed Loop Pulsating Heat Pipe (CLPHP). CLPHP is made up of copper tubing with internal diameter of 3mm and outer diameter of 4mm. the tube had 2 meandering turns. The length of evaporator and condenser section was 380mm. Working fluids are selected as HP-Hytherm-500, water and different binary mixtures. The graphs are plotted, in order to study, characteristics of the thermal resistance and average evaporator temperatures at different heat input for different working fluids. Experimental study on PHP indicated that working fluid is an important factor for the performance of PHPs. The result shows that, the thermal resistance decreases more rapidly with the increase of the heating power , whereas slowly decreases at input power above . HP-Hytherm-500 gives best thermal performance in comparison with the other working fluids