The thermal behavior of a compact mini-loop thermosyphon is experimentally studied at different filling ratios (20%, 30%, 40%, 50%, and 70%) and tilt angles (0 deg, 30 deg, 45 deg, 60 deg, and 90 deg) for the heat loads of 20–300 W using distilled water as the heat pipe fluid. The presence of microfins at the evaporator results in an average decrease of 37.4% and 15.3% in thermal resistance and evaporator wall temperature, respectively, compared with the evaporator with a plain surface. Both filling ratio (FR) and tilt angle influence the heat transfer performance significantly, and the best performance of the mini-loop thermosyphon is obtained at their optimum values. The thermal resistance and thermal efficiency values lie in the ranges of 0.73–0.076 K/W and 65–88.3% for different filling ratios and tilt angles. Similarly, evaporator heat transfer coefficient and evaporator wall temperature show significant variation with changes in filling ratio and tilt angle. A combination of the optimum filling ratio and tilt angle shows a lowest thermal resistance of 0.076 K/W and a highest evaporator wall temperature of 68.6 °C, which are obtained at 300 W. The experimental results recommend the use of mini-loop thermosyphon at an optimum filling ratio for electronics cooling applications, which have a heat dissipation of 20–300 W.
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December 2019
Research-Article
Effect of Filling Ratio and Tilt Angle on the Performance of a Mini-Loop Thermosyphon
Trijo Tharayil,
Trijo Tharayil
Department of Mechanical Engineering,
Pattoor, Alappuzha 690529, Kerala,
e-mail: trijotharayil@gmail.com
Sree Buddha College of Engineering
,Pattoor, Alappuzha 690529, Kerala,
India
e-mail: trijotharayil@gmail.com
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Neha Gitty,
Neha Gitty
Department of Mechanical Engineering,
Coimbatore 641114, Tamil Nadu,
e-mail: gittyneha@gmail.com
Karunya Institute of Technology and Sciences
,Coimbatore 641114, Tamil Nadu,
India
e-mail: gittyneha@gmail.com
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Lazarus Godson Asirvatham,
Lazarus Godson Asirvatham
1
Department of Mechanical and Aerospace Engineering,
Coimbatore 641114, Tamil Nadu,
e-mail: godson@karunya.edu
Karunya Institute of Technology and Sciences
,Coimbatore 641114, Tamil Nadu,
India
e-mail: godson@karunya.edu
1Corresponding author.
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Somchai Wongwises
Somchai Wongwises
Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE),
Faculty of Engineering,
Department of Mechanical Engineering,
Bangmod, Bangkok 10140,
e-mail: somchai.won@kmutt.ac.th
Faculty of Engineering,
Department of Mechanical Engineering,
King Mongkut’s University of Technology Thonburi
,Bangmod, Bangkok 10140,
Thailand
e-mail: somchai.won@kmutt.ac.th
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Trijo Tharayil
Department of Mechanical Engineering,
Pattoor, Alappuzha 690529, Kerala,
e-mail: trijotharayil@gmail.com
Sree Buddha College of Engineering
,Pattoor, Alappuzha 690529, Kerala,
India
e-mail: trijotharayil@gmail.com
Neha Gitty
Department of Mechanical Engineering,
Coimbatore 641114, Tamil Nadu,
e-mail: gittyneha@gmail.com
Karunya Institute of Technology and Sciences
,Coimbatore 641114, Tamil Nadu,
India
e-mail: gittyneha@gmail.com
Lazarus Godson Asirvatham
Department of Mechanical and Aerospace Engineering,
Coimbatore 641114, Tamil Nadu,
e-mail: godson@karunya.edu
Karunya Institute of Technology and Sciences
,Coimbatore 641114, Tamil Nadu,
India
e-mail: godson@karunya.edu
Somchai Wongwises
Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE),
Faculty of Engineering,
Department of Mechanical Engineering,
Bangmod, Bangkok 10140,
e-mail: somchai.won@kmutt.ac.th
Faculty of Engineering,
Department of Mechanical Engineering,
King Mongkut’s University of Technology Thonburi
,Bangmod, Bangkok 10140,
Thailand
e-mail: somchai.won@kmutt.ac.th
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received May 20, 2018; final manuscript received April 3, 2019; published online May 20, 2019. Assoc. Editor: Ayyoub M. Momen.
J. Thermal Sci. Eng. Appl. Dec 2019, 11(6): 061013 (11 pages)
Published Online: May 20, 2019
Article history
Received:
May 20, 2018
Revision Received:
April 3, 2019
Accepted:
April 4, 2019
Citation
Tharayil, T., Gitty, N., Asirvatham, L. G., and Wongwises, S. (May 20, 2019). "Effect of Filling Ratio and Tilt Angle on the Performance of a Mini-Loop Thermosyphon." ASME. J. Thermal Sci. Eng. Appl. December 2019; 11(6): 061013. https://doi.org/10.1115/1.4043464
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