Experimental study of a two-phase thermosyphon loop in conditions of high fluidic and thermal loads

An experimental study was conducted on a two-phase thermosyphon loop with a total length of 2.1 m, using Ethanol as a working fluid. The influence of the filling ratio, at 40 and 62%, on the thermo-hydraulic behavior was investigated. The applied heat fluxes on the evaporator are ranged between 10 and 60 W/cm, which corresponds to high values compared to those published elsewhere. One can notice that the confinement conditions associated with high filling ratios contribute to the training of the liquid phase from the evaporator to the condenser, which increases the drying limit of the evaporator due to a significant increase of the flow rate of the sub-cooled liquid at the inlet of the evaporator.