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Research Papers: Radiative Heat Transfer

Behavior of Thermally Radiating Tree-like Fins

[+] Author and Article Information
David Calamas

Research Assistant
e-mail: dmcalamas@crimson.ua.edu

John Baker

Professor
ASME Member
e-mail: john.baker@eng.ua.edu
Department of Mechanical Engineering,
University of Alabama,
290 Hardaway Hall, 7th Avenue,
Tuscaloosa, AL 35487

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received July 23, 2012; final manuscript received April 4, 2013; published online July 18, 2013. Assoc. Editor: Frank Cunha.

J. Heat Transfer 135(8), 082701 (Jul 18, 2013) (9 pages) Paper No: HT-12-1398; doi: 10.1115/1.4024279 History: Received July 23, 2012; Revised April 04, 2013

The performance of tree-like fins with varying bifurcation angle, surface emissivity, material, width-to-thickness ratio, and base heat rate was examined. Overall system performance was examined computationally. The computational results have been validated, verified, and cast in terms of commonly defined dimensionless parameters. Tree-like fins were found to be more effective and more efficient than the rectangular fins. Fin efficiency and effectiveness were found to increase with increasing bifurcation angles while base temperatures were found to decrease with increasing bifurcation angles. As expected, base temperatures were highest for the largest width-to-thickness ratios and smallest for materials with relatively higher thermal conductivities.

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Figures

Grahic Jump Location
Fig. 1

Tree-fin nomenclature and coordinate system

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Fig. 2

30, 60, and 90 deg bifurcation angle tree-like fins

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Fig. 3

Computational model validation nomenclature and coordinate system

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Fig. 4

Computational model validation

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Fig. 5

Fin effectiveness with varying heat rate

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Fig. 6

Fin effectiveness with varying material for the 90 deg tree-like fin

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Fig. 7

Fin effectiveness per unit mass with varying material for the 90 deg tree-like fin

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Fig. 8

Fin effectiveness with varying width-to-thickness ratio for the 90 deg tree-like fin

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Fig. 9

Tree-like fin temperature isolines

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Fig. 10

Fin efficiency with varying heat rate

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Fig. 11

Fin efficiency with varying material for the 90 deg tree-like fin

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Fig. 12

Fin efficiency with varying width-to-thickness ratio for the 90 deg tree-like fin

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Fig. 13

Fin base temperatures with varying heat rate

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Fig. 14

Fin base temperature for varying fin material for the 90 deg tree-like fin

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Fig. 15

Fin base temperature for varying width-to-thickness ratio for the 90 deg tree-like fin

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Fig. 16

Tree-like fin effectiveness correlation

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