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Research Papers

Numerical Performance Analysis of Constructal I and Y Finned Heat Exchanging Modules

[+] 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. Electron. Packag 131(3), 031012 (Jul 31, 2009) (10 pages) doi:10.1115/1.3144152 History: Received July 29, 2008; Revised January 30, 2009; Published July 31, 2009

Thermal conductance and loss of pressure are among the most relevant parameters based on which a heat exchanger has to be chosen. Starting from this observation this study treated and compared the performances of different exchanging systems, always in condition of forced convection of air in laminar flow. The study parameters were two fin shapes, four modules (shapes), and four duct geometries (depending on the parameter shape ratio, defined in Sec. 3). The approach chosen was that of Bejan’s Constructal theory numerically implemented by the finite element code COMSOL MULTIPHYSICS . The results showed the importance of considering not the heat removing performance alone as a decisional parameter and proved that the “classic” I-shaped finned systems very often are not the best performing ones, while optimized Y profiles may offer better perspectives. Having demonstrated the relevance of the present approach, future developments of this research will have to put together the different evaluation criteria presented in an only performance parameter.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Heat exchanging module with Y-fins

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Figure 2

Ram I-fin and Y-fin

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Figure 3

Example of geometrical model simulated (duct) and its characteristic dimensions

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Figure 4

Shape A: I-fins just at the bottom surface

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Figure 5

Shape B: I-fins both at the bottom and at the top surface

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Figure 6

Shape C: Y-fins just at the bottom surface

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Figure 7

Shape D: Y-fins both at the bottom and at the top surface

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Figure 8

Example of meshing (case θ=0.15)

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Figure 9

Example of velocity (a) and temperature (b) fields (shape A; θ=0.10)

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Figure 10

Example of velocity (a) and temperature (b) fields (shape B; θ=0.10)

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Figure 11

Example of velocity (a) and temperature (b) fields (shape C; θ=0.10)

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Figure 12

Example of velocity (a) and temperature (b) fields (shape D; θ=0.10)

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Figure 13

Dimensionless conductance q∗ [-] in function of Reynolds number Re: [-] case θ=0.10

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Figure 14

Dimensionless loss of pressure Δp∗ [-] in function of Reynolds number Re: [-] case θ=0.10

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Figure 15

Dimensionless conductance q∗ [-] in function of Reynolds number Re: [-] case θ=0.15

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Figure 16

Dimensionless loss of pressure Δp∗ [-] in function of Reynolds number Re: [-] case θ=0.15

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Figure 17

Dimensionless conductance q∗ [-] in function of Reynolds number Re: [-] case θ=0.20

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Figure 18

Dimensionless loss of pressure Δp∗ [-] in function of Reynolds number Re: [-] case θ=0.20

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Figure 19

Example of velocity (a) and temperature (b) fields (shape A; θ=0.25)

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Figure 20

Example of velocity (a) and temperature (b) fields (shape B; θ=0.25)

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Figure 21

Example of velocity (a) and temperature (b) fields (shape C; θ=0.25)

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Figure 22

Example of velocity (a) and temperature (b) fields (shape D; θ=0.25)

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Figure 23

Dimensionless conductance q∗ [-] in function of Reynolds number Re: [-] case θ=0.25

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Figure 24

Dimensionless loss of pressure Δp∗ [-] in function of Reynolds number Re: [-] case θ=0.25

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