Mixed convection in an opened partitioned cavity provided by heated blocks and submitted to down air vertical jet

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Mixed convection in an opened partitioned

cavity provided by heated blocks and submitted to down air vertical jet

Article in Physical and Chemical News · January 2013

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Phys. Chem. New, Vol. 67, pp. 84-89 PCN

MIXED CONVECTION IN AN OPENED PARTITIONED CAVITY PROVIDED BY HEATED BLOCKS AND SUBMITTED TO DOWN AIR VERTICAL JET

CONVECTION MIXTE DANS UNE CAVITÉ OUVERTE PARTITIONNÉS MUNIE DE BLOCS CHAUFFANTS ET SOUMISE

À UN JET D’AIR VERTICAL DESCENDANT

O. Mahrouche*, M. Najam, M. El Alami

Groupe de Thermique, Laboratoire de Physique des Matériaux, Micro électronique, Automatique et Thermique (LPMMAT), Département de Physique, Faculté des Sciences, Université Hassan II Ain Chock, BP. 5366, Maârif, Casablanca, Maroc

* Corresponding author. E-mail: mahrouche.ouafaa@gmail.com Received: 23 December 2012; revised version accepted: 30 January 2013

Abstract

Numerical study of mixed convection is conducted in a rectangular partitioned cavity, provided by two blocks heated at a constant temperature T

The upper horizontal wall is fitted by a vertical axis inlet opening of fresh air C

. The lower horizontal wall is fitted by a vertical axis outlet opening C

The left vertical wall is adiabatic, the other walls are kept cold to T

<T

The control parameters are the Rayleigh number Ra = 10

, the Reynolds number (10≤Re≤60), the Prandtl number (Pr = 0.72), the relative distance between the blocks (D=h/H=0.5), the blocks height (B=l/L=0.5), the openings (C

=C

=d/H=0.375), and the form factor (A=L/H=3).

The results obtained show that heat transfer and the flow depend with Reynolds number Re.

Keywords: Mixed convection; Rectangular cavity; Heat transfer; Numerical study; Vertical jet; heated blocks.

Résumé

On étudie numériquement la convection mixte dans une enceinte rectangulaire partitionnée, munie de deux blocs chauffants à température constante T

. La paroi horizontale supérieure est munie d’une ouverture à axe vertical d’admission d’air frais C

, la paroi horizontale du bas est munie d’une ouverture d’évacuation à axe vertical d’air C

. La paroi verticale gauche est adiabatique, les autres parois sont refroidies à la température T

<T

. Les paramètres de contrôle sont les nombres de Rayleigh (Ra=10

), de Reynolds (10≤Re≤60), de Prandtl (Pr=0.72), la distance relative D entre les blocs D=h/H=0.5, la taille des blocs B=l/L=0.5, les ouvertures C

=C

=d/H=0.375 et le facteur de forme A=L/H=3. Les résultats obtenus montrent que les écoulements et le transfert de chaleur dépendent du nombre de Reynolds Re.

Mots clés: Convection mixte ; Cavité rectangulaire ; Transfert de chaleur ; Etude numérique ; Jet vertical ; Blocs chauffants.

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