A two-phase closed thermosyphon

Abstract An experimental study on the heat transfer performance of a two-phase closed thermosyphon together with a simple theoretical analysis for its maximum heat transfer capacity has been made. Water and Freon-11 were used as the working fluids. Out of many possible controlling variables, the effects of (a) the amount of working fluid in the tube, (b) the ratio of heated-length to cooled length, (c) the operating pressure, (d) the heat flux and (e) the working fluid, were investigated.