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Plume flows in porous media driven by horizontal differential heating

Published online by Cambridge University Press:  06 March 2012

P. Adamou-Graham  and
P. G. Daniels
P. Adamou-Graham
Affiliation:
Centre for Mathematical Science, City University London, Northampton Square, London EC1V 0HB, UK
P. G. Daniels*
Affiliation:
Centre for Mathematical Science, City University London, Northampton Square, London EC1V 0HB, UK
*
†Email address for correspondence: p.g.daniels@city.ac.uk
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Abstract

In this paper we describe flow through a porous medium in a two-dimensional rectangular cavity driven by differential heating of the impermeable lower surface. The upper surface is held at constant pressure and at a constant temperature equal to the minimum temperature of the lower surface, while the sidewalls are impermeable and thermally insulated. Numerical results for general values of the Darcy–Rayleigh number and the cavity aspect ratio are compared with theoretical predictions for the small Darcy–Rayleigh number limit where the temperature field is conduction-dominated, and with a boundary-layer theory for the large Darcy–Rayleigh number limit where convection is significant. In the latter case a horizontal boundary layer near the lower surface conveys fluid to the hot end of the cavity where it rises to the upper surface in a narrow plume. Predictions are made of the vertical heat transfer through the cavity.

JFM classification

Convection: Convection Convection: Convection in cavities Convection: Convection in porous media
Type
Papers
Information
Journal of Fluid Mechanics , Volume 696 , 10 April 2012 , pp. 263 - 284
Copyright
Copyright © Cambridge University Press 2012

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