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Research Papers: Evaporation, Boiling, and Condensation

Heat Transfer Performance of a Glass Thermosyphon Using Graphene–Acetone Nanofluid

[+] Author and Article Information
Lazarus Godson Asirvatham

Department of Mechanical Engineering,
Karunya University,
Coimbatore 641 114, India
e-mails: godson@karunya.edu; godasir@yahoo.co.in

Somchai Wongwises

Fluid Mechanics,
Thermal Engineering and Multiphase Flow Research Laboratory (FUTURE),
Department of Mechanical Engineering,
Faculty of Engineering,
King Mongkut's University
of Technology Thonburi,
Bangmod, Bangkok 10140, Thailand
e-mail: somchai.won@kmutt.ac.th

Jithu Babu

Department of Mechanical Engineering,
Karunya University,
Coimbatore 641 114, India
e-mail: Jithubabu90@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 3, 2014; final manuscript received March 3, 2015; published online July 14, 2015. Assoc. Editor: Bruce L. Drolen.

J. Heat Transfer 137(11), 111502 (Jul 14, 2015) (9 pages) Paper No: HT-14-1287; doi: 10.1115/1.4030479 History: Received May 03, 2014

This study presents an enhancement in the heat transfer performance of a glass thermosyphon using graphene–acetone nanofluid with 0.05%, 0.07%, and 0.09% volume concentrations. The heat load is varied between 10 and 50 W in five steps. The effect of heat load, volume concentration, and vapor temperature on thermal resistance, evaporator and condenser heat transfer coefficients, are experimentally investigated. A substantial reduction in thermal resistance of 70.3% is observed for the maximum concentration of 0.09% by volume of graphene–acetone nanofluid. Further, an enhancement in the evaporator heat transfer coefficient of 61.25% is observed for the same concentration. Also from the visualization study the different flow patterns in the evaporator, adiabatic, and condenser regions are obtained for acetone at different heat inputs.

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Figures

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Fig. 1

Schematic diagram of experimental setup

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Fig. 2

Photos of visualization for acetone–graphene nanofluid at 0.09 vol. %

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Fig. 3

SEM image of 0.09 vol. % of acetone–graphene nanofluid

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Fig. 4

Variation of wall temperature with respect to axial length

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Fig. 5

Adiabatic wall temperature as a function of heat load

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Fig. 6

Evaporator and condenser surface temperature as a function of heat load

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Fig. 7

Evaporator and condenser surface temperature difference as a function of heat load

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Fig. 8

Variation in thermal resistance as a function of heat load

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Fig. 10

Evaporator heat transfer coefficient with respect to heat load

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Fig. 9

Effective thermal conductivity of thermosyphon as a function of heat load

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Fig. 14

Condensation section of thermosyphon at different heat load

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Fig. 13

Flow regimes at adiabatic section of thermosyphon at different heat load

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Fig. 12

Flow regimes at evaporator section of thermosyphon at different heat load

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Fig. 11

Condenser heat transfer coefficient with respect to heat load

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