Porous medium modeling of air-cooled condensers

Hooman, K. and Gurgenci, H. (2010) Porous medium modeling of air-cooled condensers. Transport in Porous Media, 84 2: 257-273. doi:10.1007/s11242-009-9497-8

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Author Hooman, K.
Gurgenci, H.
Title Porous medium modeling of air-cooled condensers
Journal name Transport in Porous Media   Check publisher's open access policy
ISSN 0169-3913
1573-1634
Publication date 2010-09
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s11242-009-9497-8
Volume 84
Issue 2
Start page 257
End page 273
Total pages 17
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2011
Language eng
Subject 091305 Energy Generation, Conversion and Storage Engineering
091501 Computational Fluid Dynamics
091502 Computational Heat Transfer
C1
0904 Chemical Engineering
0905 Civil Engineering
Formatted abstract
This article presents a porous media transport approach to model the performance of an air-cooled condenser. The finned tube bundles in the condenser are represented by a porous matrix, which is defined by its porosity, permeability, and the form drag coefficient. The porosity is equal to the tube bundle volumetric void fraction and the permeability is calculated by using the Karman-Cozney correlation. The drag coefficient is found to be a function of the porosity, with little sensitivity to the way this porosity is achieved, i. e., with different fin size or spacing. The functional form was established by analyzing a relatively wide range of tube bundle size and topologies. For each individual tube bundle configuration, the drag coefficient was selected by trial and error so as to make the pressure drop from the porous medium approach match the pressure drop calculated by the heat exchanger design software ASPEN B-JAC. The latter is a well-established commercial heat exchanger design program that calculates the pressure drop by using empirical formulae based on the tube bundle properties. A close correlation is found between the form drag coefficient and the porosity with the drag coefficient decreasing with increasing porosity. A second order polynomial is found to be adequate to represent this relationship. Heat transfer and second law (of thermodynamics) performance of the system has also been investigated. The volume-averaged thermal energy equation is able to accurately predict the hot spots. It has also been observed that the average dimensionless wall temperature is a parabolic function of the form drag coefficient. The results are found to be in good agreement with those available in the open literature.
© 2009 Springer Science+Business Media B.V.
Keyword Dry cooling
Porous medium
Form drag
Viscous drag
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 14 November 2009.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2011 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 30 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 35 times in Scopus Article | Citations
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Created: Tue, 24 Aug 2010, 10:39:27 EST by Kamel Hooman on behalf of School of Mechanical and Mining Engineering