Resumo

ARAMAYO, A.M.; ESTEBAN, S.  e  CARDON, L.. Conjugate heat transfer in a two stage trapezoidal cavity stack. Lat. Am. appl. res. [online]. 2009, vol.39, n.1, pp.1-9. ISSN 0327-0793.

The flow pattern and heat transfer in a pair of cavities stacked one over the other, with a separating solid plate in between, are numerically studied. The configuration idealizes two trays in a multiple effect desalinator. The work focuses on the computational modeling of the two conjugate recirculations in the cavities, conductively coupled through the thin separating plate. The effect of the plate physical parameters, thickness and conductivity, on the heat transfer are also analyzed. Plates made of glass, steel and aluminum of 2, 3, 4 and 6 mm are studied. Cavity flow and temperature patterns, depicted by streamlines, velocity fields, and isotherms are analyzed for steady state. Attention was paid to the temperature variation over, and heat flow through the separating plate. Global Nusselt numbers are calculated for the bottom side of the lower cavity. Data are obtained for air as the working fluid (Pr=0.7) in the range 10³<Ra_H<10⁷.

Palavras-chave : Cavity; Natural Convection; Conjugate Heat Transfer.

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