THE EXPERIMENTAL ANALYSIS OF CLOSE LOOP PULSATING HEAT PIPE BY USING R-134a AT 83%,70%AND 50% FR

The closed loop Pulsating Heat Pipes (CLPHPs) are emerging new technology for electronics cooling equipments.It simply two-phase passive heat transfer devices that enhances large amount of heat.It transport heat from evaporator to condenser by the principle of evaporation and condensation of a working fluid with minimum drop of temperature.The present work represents transient state experiment conducted on multiturn closed loop PHP. The Evaporator and condenser wall temperatures are measured with the help of thermocouples.Use the capillary tube in the evaporator and condenser sections with inner diameter of 3 mm and outer diameter of 4 mm. The total length of the closed loop pulsating heat pipe is 6M.The evaporator and condenser sections are 150mm and 150 mm respectively. The experiments are conducted in three mode of condition i.e vertical ,inclined and horizontal.The PHP is tested with working fluid R134a for different fill ratios from 50% to 83%.The performance parameters like temperature difference between evaporator and condenser and thermal resistance.The experimental results shows that 50% filling ratio within the tube shows better heat transfer characteristics among 83% FR and 70% FR. The 50% filling ratio in horizontal mode of operation shows lowest thermal resistance and higher heat transfer coefficient.