Experimental research was conducted to understand heat transfer characteristic of pulsating heat pipe in this paper, and the PHP is made of high quality glass capillary tube. Under different fill ratio, heat transfer rate and many other influence factors, the flow patterns were observed in the start-up, transition and stable stage. The effects of heating position on heat transfer were discussed. The experimental results indicate that no annular flow appears in top heating condition. Under different fill ratios and heat transfer rate, the flow pattern in PHP is transferred from bulk flow to semi-annular flow and annular flow, and the performance of heat transfer is improved for down heating case. But for pulsating heat pipe with changing diameters the thermal resistance is higher than that with uniform diameters.
Abstract Heat pipes come handy now-a-days as they operate with highest heat conductance compared to any other mode of heat transfer and available over wide range of parameters. In the present study de-ionized water flow in the plain thermo-syphon, Sintered Copper wick and Helical grooved heat pipes with simultaneous evaporation, adiabatic and condensation phenomenon are studied using Heat pipe test equipment. In this equipment a heat pipe subjected to a predetermine heat load by a resistance heater at its evaporator end and water jacket with controlled flow of water is employed to dissipate the heat energy at the condenser end.
The aim of this study was to perform life testing and determine the effect of working fluid on the corrosion of a heat pipe with a sintered wick. The heat pipe was made from a copper tube. The inner heat pipe was filled with