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Research Papers: Natural and Mixed Convection

Natural Convection Heat Transfer From Horizontal Rectangular Inverted Notched Fin Arrays

[+] Author and Article Information
Sanjeev D. Suryawanshi1

Department of Mechanical Engineering, SSVPS’s BSD Polytechnic, Dhule (MS) 424 005, Indiasanjeev_suryawanshi@yahoo.co.in

Narayan K. Sane

Department of Mechanical Engineering, J.S. College of Engineering, Pune 28 (MS) 411 028, Indianarayan_sane@yahoo.co.in

1

Corresponding author.

J. Heat Transfer 131(8), 082501 (Jun 03, 2009) (6 pages) doi:10.1115/1.3109993 History: Received July 26, 2008; Revised January 24, 2009; Published June 03, 2009

The variables for natural convection cooling with the help of finned surfaces are orientation and geometry. In lengthwise short array (L/H5), where single chimney flow pattern is present, a stagnant zone is created at the central bottom portion of fin array channel and hence it does not contribute much in heat dissipation. Hence it is removed in the form of inverted notch at the central bottom portion of fin to modify its geometry for enhancement of heat transfer. An experimental setup is developed for studying the investigation on normal and inverted notched fin arrays (INFAs). Fin spacing, heater input, and percentage of area removed in the form of inverted notch are the parameters. For few spacing, it is verified by computational fluid dynamics analysis (Course Notes on Introduction to Commercial CFD of Tridiagonal Solutions, Pune), and the results are well matching. It is found that the average heat transfer coefficient for INFAs is nearly 30–40% higher as compared with normal array.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Single chimney flow pattern for normal fin

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Figure 2

Single chimney flow pattern for INFA

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Figure 3

Experimental setup with thermocouple locations

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Figure 4

Quarter channel of fin array under investigation

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Figure 5

Computational domain with extended boundaries and heat source

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Figure 6

Variation of ha with fin spacing

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Figure 7

Variation of ha with different percentage of area removed for 6 mm spacing

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Figure 8

Variation of Nub with fin spacing

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Figure 9

Effect of inverted notch on surface temperature

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Figure 10

Variation of Nub for different configurations

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Figure 11

Comparison of experimental and CFD results for 9 mm fin spacing; effect of percentage area removed on qconvection

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Figure 12

The proposed horizontally oriented INFAs correlation

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Figure 13

Photographs showing flow visualization by simple smoke technique

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