Research Papers: Heat Transfer Enhancement

Experimental Investigation of Thermal and Hydraulic Performance of V-Shape Corrugated Carbon Foam

[+] Author and Article Information
L. C. Chow

e-mail: Louis.chow@ucf.edu
Department of Mechanical and
Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816-2450

D. P. Rini

RINI Technologies, Inc.,
582 South Econ Circle,
Oviedo, FL 32765

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 25, 2012; final manuscript received August 12, 2013; published online November 7, 2013. Assoc. Editor: W. Q. Tao.

J. Heat Transfer 136(2), 021902 (Nov 07, 2013) (10 pages) Paper No: HT-12-1464; doi: 10.1115/1.4025433 History: Received August 25, 2012; Revised August 12, 2013

In air-cooled heat exchangers, air-side thermal resistance is usually the largest compared to conduction and liquid-side thermal resistances. Thus, reducing the air-side thermal resistance can greatly improve overall cooling performance. The performance of an air-cooled heat exchanger is usually characterized by the rate of heat which can be transferred and the pumping power required to convect the heat away. This paper presents a method of utilizing V-shape corrugated carbon foam to improve thermal performance. The air-side heat transfer coefficient and the pressure drop across the foam have been investigated using different V-shape foam geometrical configurations obtained by varying its length and height. Based on design considerations and availability, the foam length has been chosen to be 25.4, 38.1, and 52.1 mm, while its height is 4.4, 6.8, and 11.7 mm, resulting in nine different test pieces of foam with different heights and lengths. A total number of 81 experiments were carried out with different air face velocities (0.7-9m/s) and heat fluxes at the heater surface (0.5-2W/cm2). The pressure drop across the V-shape corrugated carbon foam as well as inlet air, exit air, foam, and ambient temperatures were measured. Of the nine V-shape configurations, the foam with the shortest length and tallest height gives the best performance. The present results are also compared with the results of prior work using different carbon foam geometries. It is shown that V-shape corrugated carbon foam provides better heat transfer coefficient and the overall performance.

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Fig. 2

Air volume flow rate measurements (a) frontal view (b) top view

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Fig. 1

Schematic of test apparatus

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Fig. 3

V-shape carbon foam geometries and test section

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Fig. 8

Effect of foam length on hydraulic performance

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Fig. 7

Effect of foam height on hydraulic performance

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Fig. 4

Temperature measurements

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Fig. 5

Effect of foam height on thermal performance

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Fig. 6

Effect of foam length on thermal performance

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Fig. 9

Foam configurations used for comparison with V-shape corrugated carbon foam

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Fig. 10

Comparison between V-shape corrugated foam and other foam geometries

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Fig. 11

Volumetric HTC vs fluid power per unit volume

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Fig. 12

NTU per unit fluid power at different average air velocities



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