Heat transfer characteristics of Pulsating Heat Pipe (PHP) with fill ratio of 45%

55%

62%

70% were researched experimentally for aqueous ethanol with volume ratio of 13:1

2:1

1:1

1:2

1:13 as working fluids. Experimental results indicated that

with lower fill ratio

the thermal resistance of aqueous ethanol PHP was better than that of water or ethanol PHP; and with higher fill ratio

the characteristics of heat transfer using water as pure working fluid were better than that of using ethanol pure working fluid or aqueous ethanol fluids. It was found out from experimental results that

the heat transfer characteristics of PHP depended on the fill ratio of working fluids and the volume ratio of the two components which related to vapor-liquid balance

physical properties and the association of molecules.