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Heat source position influence on flows and the heat transfer in a t form cavity

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Heat source position influence on flows and the heat transfer in a t form cavity

Article in Physical and Chemical News · January 2013

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Phys. Chem. New, Vol. 67, pp. 34-39, 2013 PCN

HEAT SOURCE POSITION INFLUENCE ON FLOWS AND THE HEAT TRANSFER IN A T FORM CAVITY

INFLUENCE DE LA POSITION DES SOURCES DE CHALEUR SUR LES ÉCOULEMENTS ET LE TRANSFERT THERMIQUE PAR CONVECTION MIXTE DANS UNE CAVITÉ EN FORME DE T

A. Meskini

1

*, Y. Abid

2

, A. Oubarra

3

, M. Najam

2

, M. El Alami

2

1 LTCI, Ecole Nationale Supérieure d’Electricité et de Mécanique, Université Hassan II Casablanca I, Maroc

2 LPMMAT, Département de Physique, Faculté des Sciences, Université Hassan II Casablanca I, Maroc

3 LM, Département de Physique, Faculté des Sciences, Université Hassan II Casablanca I, Maroc

* Corresponding author. E-mail: Ah_mesk@yahoo.fr Received: 23 December 2012; revised version accepted: 30 January 2013

Abstract

In this work, we study the mixed convection cooling of electronic components (blocks) placed on horizontal parallel plates (horizontal channel with openings). The periodic geometry configuration allowed us to reduce the study area to a T form cavity or inverted T form cavity( when the blocks are placed on the upper plate of the channel). The cavity is subjected to a jet of fresh air from below. The blocks are heated at constant temperature

θc

. The opposite wall of the blocks is kept cold at temperature

θf

(

θf

<

θc

). The governing equations were solved by the finite difference method. The main control parameters are the Rayleigh number Ra (Ra = 10

5

), the Reynolds number (100 = Re

300), the number of Prandt Pr (Pr = 0.72) and the height B of the blocks (B = h'/H = 1/2). The results of this study are presented in terms of thermal and dynamic fields. In addition, correlations of the heat transfer, in terms of the Nusselt number as a function of Reynolds number; are proposed in this work .

Keywords: Mixed Convection, electronic components cooling; Numerical study; T form cavity.

Résumé

Dans ce travail nous étudions le refroidissement par convection mixte des composants électroniques (blocs) placés sur des cartes horizontales percées (canal horizontal avec ouvertures). Cette configuration présente une géométrie périodique ce qui nous a permis de réduire le domaine d’étude à une cavité en forme de T ou T inversée. La cavité est soumise à un jet d’air frais venant du bas. Les blocs sont chauffés à température constante θ

c

. La paroi en face des blocs est maintenue froide à la température θ

f

f

< θ

c

). Les équations gouvernantes ont été résolues par la méthode des différences finies Les principaux paramètres de contrôles sont : le nombre de Rayleigh Ra (Ra=10

5

), le nombre de Reynolds (100≤ Re =300), le nombre de Prandt Pr (Pr

= 0.72) et la hauteur B des blocs (B= h’/H = 1/2). Les résultats de cette étude sont présentés en termes de champs dynamique et thermique. En outre, des corrélations du transfert thermique sont présentées sous la forme du nombre de Nusselt en fonction du nombre de Reynolds.

Mots clés : Convection mixte ; Composants électroniques ; Etude numérique ; Cavité en T.

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