Study of the Effect of Working Fluids on The Thermal Performance of A Horizontal Heat Pipe with Stainless Steel Wick

The present work aims to study the effects of working fluids on thermal performance heat pipe with a wick and in horizontal position. experiments were conducted using copper 20.8 mm inner diameter, length evaporator, condenser, adiabatic regions 300 mm, 350 respectively. selected water, Methanol, ethanol, different binary mixtures (50: 50) %, (30: 70) (70: 30) % mixing ratios. filling ratio was 50% evaporator volume for all fluids, input values 20, 30, 40, 50 W. results show that charged Methanol has resistance (0.85166oC/W), lowest value. is (0.785 oC/W) (50 methanol: ethanol). Both are achieved at W input. Also, input, highest value transfer coefficient when water as fluid (510.386 W/m2. oC), mixture (70 water: 30% methanol) (556.78 oC).