Heat transfer characteristics inside an evaporator of a two-phase closed loop thermosyphon with Saw Tooth Ribbed evaporator Surface

Abstract

An experimental investigation on heat transfer characteristics inside an evaporator of a two-phase closed-looped thermosyphon is carried out. Tests are conducted using two different evaporator surfaces, namely Saw Tooth Ribbed Surface (STRS) & Smooth Surface (SS) and three different working fluids- acetone, ethanol & methanol. It is found that Saw Tooth Ribbed Surface can transfer more heat than that of smooth surface and among all working fluids; ethanol gives best performance in terms of heat dissipation rate. Heat flux dissipated through STRS is about 35%, 37% and 38% higher than that of smooth surface respectively at 10°C wall superheat while methanol, ethanol and acetone are used as working fluid. Moreover, maximum heat transfer coefficient is achieved through STRS while ethanol is used as working fluid.