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Technical Brief

Experimental Investigation of the Heat Transfer Performance of a Hybrid Cooling Fin Thermosyphon

[+] Author and Article Information
Christina A. Pappas

Department of Mechanical and Aerospace Engineering,
University of Virginia,
122 Engineer's Way,
Charlottesville, VA 22904
e-mail: caj5p@virginia.edu

Donald A. Jordan

Senior Research Scientist
Department of Mechanical and Aerospace Engineering,
University of Virginia,
122 Engineer's Way,
Charlottesville, VA 22904
e-mail: dj8n@virginia.edu

Pamela M. Norris

Professor
Fellow ASME
Department of Mechanical and Aerospace Engineering,
University of Virginia,
122 Engineer's Way,
Charlottesville, VA 22904
e-mail: pamela@virginia.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 5, 2013; final manuscript received July 2, 2014; published online July 29, 2014. Assoc. Editor: Patrick E. Phelan.

J. Heat Transfer 136(10), 104502 (Jul 29, 2014) (5 pages) Paper No: HT-13-1397; doi: 10.1115/1.4028000 History: Received August 05, 2013; Revised July 02, 2014

The effect of fill volume on the heat transfer performance of a hybrid cooling fin thermosyphon, characterized by an airfoil cross-sectional shape and a slot-shaped cavity, is investigated. The performance was examined at three fill volumes, expressed as a percentage of the evaporator section: 0%, 60%, and 240%. These were chosen to represent three distinct regimes: unfilled, filled, and overfilled evaporator sections, respectively. The cross section of this copper–water thermosyphon has a NACA0010 shape with a chord length of 63.5 mm and an aspect ratio (ratio of the length of the evaporator section to the cavity width) of 1.109. The evaporator length comprises 8.3% of the total thermosyphon length. The air-cooled condenser section was placed in a uniform air flow in the test section of an open return wind tunnel. The rate of heat transfer, or performance, was measured as a function of fill volume and evaporator temperature. The heat transfer performance increased by 100–170% by adding 0.86 ml of working fluid (de-ionized water), i.e., when the fill volume increased from 0% to 60%, which illustrates the improvement of a cooling fin's heat transfer rate by converting it to a hybrid cooling fin thermosyphon. Of the fill volumes investigated, the thermosyphon achieves a maximum heat transfer rate and highest average surface temperature at the 60% fill volume. Overfilling the evaporator section at 240% fill results in a slight decrease in performance from the 60% fill volume. The results of this study demonstrate the feasibility of hybridizing a cooling fin to act both as a cooling fin and a thermosyphon.

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References

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Figures

Grahic Jump Location
Fig. 1

(a) Schematic of the steady state experimental setup in the wind tunnel test section, (b) side view of the thermosyphon assembly with thermocouples attached, and (c) thermosyphon cross section with labeled dimensions

Grahic Jump Location
Fig. 2

The rate of heat transfer as a function of evaporator temperature for the 0%, 60%, and 240% fill volumes

Grahic Jump Location
Fig. 3

The surface temperature as measured by thermocouples placed along the length of the condenser section of the thermosyphon for the 0%, 60%, and 240% fill volumes when the evaporator temperature is 157 °C

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