International Journal of Mechanical Engineering and Research

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The Eexperimental Analysis to Evaluate Heat Transfer Characteristics of Close Loop Pulsating Heat Pipe

Research Area: Volume 3 Issue 2 Year: 2014
Type of Publication: Article Keywords: Pulsating heat pipe, Fill Ratio, Orientation, Working fluids
Authors:
  • Prashant B. Dukare
  • Nilesh Diwakar
  • Rajeev Arya
Journal: IJMER Volume: 3
Number: 2 Pages: 41-55
Month: July-Dec
ISSN: 2277-8128
Abstract:
The closed loop Pulsating Heat Pipes (CLPHPs) are two-phase passive heat transfer devices that enhances large amount of heat in very small temperature difference.It is basically works on the principle of evaporation and condensation of a working fluid.Pulsating heat pipe cooling is the new and emerging technique in the field of thermal management of electronics.The use of traditional heat pipe is already takes place in laptops,note books,etc.In the present work, transient state experiments are conducted on multiturn closed loop PHP. The Evaporator and condenser wall temperatures are measured with the use of thermocouples.The Copper tube is used as the capillarymaterial in the evaporator and condenser sections with inner diameter of 3 mm and outer diameter is4 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 such as temperature difference between evaporator and condenser and thermal resistance.The experimental results demonstrate that 50% filling ratio within the tube shows better filling ratio among 83% FR and 70% FR. The 50% filling ratio in horizontal mode of operation shows lowest thermal resistance and higher heat transfer coefficient.The heat transfer characteristics of PHP are found to be better at a fill ratio of 50%.
Full text: PAPER-3224.pdf

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