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Research Papers: Heat Exchangers

Numerical Heat Transfer Optimization in Modular Systems of Y-Shaped Fins

[+] Author and Article Information
Giulio Lorenzini1

Department of Agricultural Economics and Engineering, Alma Mater Studiorum-University of Bologna, viale Fanin No. 50, 40127 Bologna, Italygiulio.lorenzini@unibo.it

Simone Moretti

Department of Agricultural Economics and Engineering, Alma Mater Studiorum-University of Bologna, viale Fanin No. 50, 40127 Bologna, Italy

1

Corresponding author.

J. Heat Transfer 130(8), 081801 (May 29, 2008) (5 pages) doi:10.1115/1.2927396 History: Received June 08, 2006; Revised August 31, 2006; Published May 29, 2008

This paper analyses the heat exchange behavior in systems characterized by Y-shaped fins through a numerical approach based on a CFD software. Starting from individual Y profiles, as optimized in a previous work in relation to the dimensionless conductance and to the performance parameter of efficiency, it has been here investigated the advantage of a modular use of profiles. The analysis has been performed by superimposing some dimensional constraints to make immediately comparable the results obtained in the different configurations faced. Each module considered has a number of fins depending on the angle α between the two arms of the Y profile. This number depends therefore also on the horizontal width occupied by the whole system and it is upperly limited by the value allocated to the best performing individual fin. The results showed a significant increase of the dimensionless conductance and therefore of the exchanged thermal power for those multifin configurations with low values of α. This result validates the new optimization criterion proposed.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Case I: 180deg<α<αlim.

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Figure 2

Case II: αlim2<α<180deg

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Figure 3

Case III: αlim3<α<αlim2

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Figure 4

Heat exchange efficiency for Y-shaped fins (8)

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Figure 5

Dimensionless width of the fin in function of α

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Figure 6

Number of profiles n(α) function of α, given X′*

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Figure 7

Modular system of Y-shaped fins

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Figure 8

Area subtended by the arms of a fin

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Figure 9

Mesh generation: case of the four-fin module

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Figure 10

Temperature trend: four-fin module

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Figure 11

Conductance q1* in the modular system

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