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Journal of Engineering Thermophysics
Erschienen in: Journal of Engineering Thermophysics 1/2020

01.02.2020

Geometrical Evaluation of a Channel with Alternated Mounted Blocks under Mixed Convection Laminar Flows Using Constructal Design

verfasst von: F. B. Teixeira, M. V. Altnetter, G. Lorenzini, B. D. do A. Rodriguez, L. A. O. Rocha, L. A. Isoldi, E. D. dos Santos

Erschienen in: Journal of Engineering Thermophysics | Ausgabe 1/2020

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Abstract

This work presents a numerical study of incompressible, laminar, two-dimensional, mixed convection flows in horizontal channels with two rectangular alternated blocks mounted in the surfaces. The influence of the geometry and positioning of the blocks on the heat transfer rate is evaluated using Constructal Design. The problem is subjected to two geometric constraints associated with the areas of the channel and the two blocks and three degrees of freedom: \(H_{1}/L_{1}\) (the ratio of the height to the width of the upstream block), \(H_{2}/L_{2}\) (the ratio of the height to the width of the downstream block), and \(L_{3}\) (the horizontal distance between the centers of the blocks). The purpose is to maximize the heat transfer rate per length unit \(q'\) considering three different Reynolds (\(Re_{H}= 10\), 100, and 200) and Grashof numbers (\(Gr_{H} = 650\), 6,500, and 65,000). The conservation equations of mass, momentum, and energy are solved using the Finite Volume Method, and the buoyance forces are modeled with the Boussinesq approximation. In general, the best performance is reached for the largest intrusion of the blocks. However, changes in \(Gr_{H}\) and \(Re_{H}\) affected the optimal distance (\(L_{3})_{o}\), and for \(Gr_{H}=65,000\) non-symmetrical blocks led to the best performance, showing the importance of design investigation for different flow conditions.
Vorheriger Artikel Fluid Flow and Heat Transfer Studies on a Discretely and Differently Heated Electronic Board
Nächster Artikel Title Analytical Study of Conjugated Heat Transfer of a Microchannel Fluid Flow between Two Parallel Plates

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Metadaten
Titel
Geometrical Evaluation of a Channel with Alternated Mounted Blocks under Mixed Convection Laminar Flows Using Constructal Design
verfasst von
F. B. Teixeira
M. V. Altnetter
G. Lorenzini
B. D. do A. Rodriguez
L. A. O. Rocha
L. A. Isoldi
E. D. dos Santos
Publikationsdatum
01.02.2020
Verlag
Pleiades Publishing
Erschienen in
Journal of Engineering Thermophysics / Ausgabe 1/2020
Print ISSN: 1810-2328
Elektronische ISSN: 1990-5432
DOI
https://doi.org/10.1134/S1810232820010087

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