Effects of evaporator geometry and working fluids on the performance of a two - phase loop thermosyphon

Abstract

A two-phase loop thermosyphon had been experimented with a VIew to cooling electronic components that dissipate high heat flux. Loop thermosyphon is a device consisting of an evaporator, condenser, reservoir, two check valves and forward and return lines connecting the evaporator and condenser. Experiments were conducted to assess the effects of working fluids and evaporator geometry on the performance of a two-phase loop thermosyphon. Three different working fluids were used in this study, namely water, ethanol and methanol. Boiling heat transfer was studied for different geometry of evaporator surfaces. The evaporator surface temperature, condenser inlet and outlet temperatures and cycle time were measured at a regular interval of 10 second in this study for different working fluids. The experimental results are obtained at different heat input levels which are varied from 120W to 300W with an increment of 15W for the filling volume of approximately 100%. The temperatures of evaporator surfaces and heat fluxes on the basis of heat surface area are measured, determined and discussed.