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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.450
pages 401-408

AN EXPERIMENTAL INVESTIGATION ON THE PERFORMANCE OF CLOSED LOOP PULSATING HEAT PIPE

Nandan Saha
Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai - 400085, India
P. K. Sharma
Bhabha Atomic Research Centre, Mumbai – 400085, India
Prasanta Kumar Das
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India

ABSTRACT

In this paper, an experimental investigation on the performance of multi-turn closed loop pulsating heat pipe (CLPHP) has been reported. The CLPHP with twenty-loop is made of copper (Cu) capillary tube of ID 2.5 mm. The working fluid employed is distilled water and 50% filling ratio is used in all the experimental runs. Evaporator section of CLPHP is heated by resistance nichrome wire while condenser section is cooled by constant temperature liquid coming from a cooling bath. Thermal resistance of CLPHP has been asserted for different inclination angle and input heat flux. It is found that, to start initial oscillation, 90 degree inclination (vertical) requires higher evaporator temperature compared to 70 degree inclination for same condenser temperature. At higher input power, the performance of CLPHP is similar in both the orientations and the calculated value of thermal resistance is as low as 0.03 K/W. At 0 degree inclination (horizontal), CLPHP shows very high thermal resistance which leads to the conclusion that orientation independent operation is not possible with twenty-loop CLPHP. A mathematical tool, probability density function (PDF) has been successfully utilized to predict the internal flow condition of CLPHP. PDF plot of temperature data obtained from consecutive adiabatic sections is able to predict oscillatory/circulatory nature of the flow including the direction of circulation. Moreover PDF plot of temperature obtained from evaporator and condenser section reflects the operational smoothness and efficiency of the device.


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