Closed-loop pulsating heat pipes (CLPHPs) are a new type of two-phase heat transfer devices that can transfer considerable heat in a small space via two-phase vapor and liquid pulsating flow and work with various types of two-phase instabilities so the operating mechanism of CLPHP is not well understood. In this work, two CLPHPs, made of Pyrex, were manufactured to observe and investigate the flow regime that occurs during the operation of CLPHP and thermal performance of the device under different laboratory conditions. In general, various working fluids were used in filling ratios of 40%, 50%, and 60% in horizontal and vertical modes to investigate the effect of thermo-physical parameters, filling ratio, nanoparticles, gravity, CLPHP structure, and input heat flux on the thermal performance of CLPHP. The results indicate that three types of flow regime may be observed given laboratory conditions. Each flow regime exerts a different effect on the thermal performance of the device. There is an optimal filling ratio for each working fluid. The increased number of turns in CLPHP generally improves the thermal performance of the system reducing the effect of the type of the working fluid on the aforementioned performance. The adoption of copper nanoparticles, which positively affect fluid motion, decreases the thermal resistance of the system as much as 6.06–42.76% depending on laboratory conditions. Moreover, gravity brings about positive changes in the flow regime decreasing thermal resistance as much as 32.13–52.58%.
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September 2017
This article was originally published in
Journal of Heat Transfer
Research-Article
A Comprehensive Experimental Investigation of the Performance of Closed-Loop Pulsating Heat Pipes
M. Halimi,
M. Halimi
Department of Mechanical Engineering,
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mohammadhalimi1990@gmail.com
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mohammadhalimi1990@gmail.com
Search for other works by this author on:
A. Abbas Nejad,
A. Abbas Nejad
Department of Mechanical Engineering,
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: abbasnejad@shahroodut.ac.ir
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: abbasnejad@shahroodut.ac.ir
Search for other works by this author on:
M. Norouzi
M. Norouzi
Department of Mechanical Engineering,
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mnorouzi@shahroodut.ac.ir
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mnorouzi@shahroodut.ac.ir
Search for other works by this author on:
M. Halimi
Department of Mechanical Engineering,
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mohammadhalimi1990@gmail.com
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mohammadhalimi1990@gmail.com
A. Abbas Nejad
Department of Mechanical Engineering,
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: abbasnejad@shahroodut.ac.ir
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: abbasnejad@shahroodut.ac.ir
M. Norouzi
Department of Mechanical Engineering,
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mnorouzi@shahroodut.ac.ir
Shahrood University of Technology,
University Boulevard,
P.O. Box 3619995161-316,
Shahrood, Iran
e-mail: mnorouzi@shahroodut.ac.ir
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 11, 2016; final manuscript received March 14, 2017; published online May 2, 2017. Assoc. Editor: Zhixiong Guo.
J. Heat Transfer. Sep 2017, 139(9): 092003 (11 pages)
Published Online: May 2, 2017
Article history
Received:
November 11, 2016
Revised:
March 14, 2017
Citation
Halimi, M., Abbas Nejad, A., and Norouzi, M. (May 2, 2017). "A Comprehensive Experimental Investigation of the Performance of Closed-Loop Pulsating Heat Pipes." ASME. J. Heat Transfer. September 2017; 139(9): 092003. https://doi.org/10.1115/1.4036460
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