Three-dimensional numerical simulations of free convection in a layered porous enclosure

Guerrero Martínez, F. J., Younger, P. L. , Karimi, N. and Kyriakis, S. (2017) Three-dimensional numerical simulations of free convection in a layered porous enclosure. International Journal of Heat and Mass Transfer, 106, pp. 1005-1013. (doi:10.1016/j.ijheatmasstransfer.2016.10.072)

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Abstract

Three-dimensional numerical simulations are carried out for the study of free convection in a layered porous enclosure heated from below and cooled from the top. The system is defined as a cubic porous enclosure comprising three layers, of which the external ones share constant physical properties and the internal layer is allowed to vary in both permeability and thermal conductivity. The model is based on Darcy's law and the Boussinesq approximation. A parametric study to evaluate the sensitivity of the Nusselt number to a decrease in the permeability of the internal layer shows that strong permeability contrasts are required to observe an appreciable drop in the Nusselt number. If additionally the thickness of the internal layer is increased, a further decrease in the Nusselt number is observed as long as the convective modes remain the same, if the convective modes change the Nusselt number may increase. Decreasing the thermal conductivity of the middle layer causes first an increment in the Nusselt number and then a drop. On the other hand, the Nusselt number decreases in an approximately linear trend when the thermal conductivity of the layer is increased.

Item Type:Articles
Additional Information:This work was developed under the auspices of Consejo Nacional de Ciencia y Tecnología (CONACYT) and Cluff Geothermal Ltd.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Karimi, Dr Nader and Guerrero Martinez, Mr Fernando Javier and Younger, Professor Paul
Authors: Guerrero Martínez, F. J., Younger, P. L., Karimi, N., and Kyriakis, S.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:International Journal of Heat and Mass Transfer
Publisher:Elsevier
ISSN:0017-9310
ISSN (Online):1879-2189
Published Online:03 November 2016
Copyright Holders:Copyright © 2016 Elsevier Ltd.
First Published:First published in International Journal of Heat and Mass Transfer 106:1005-1013
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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