Natural convection in vertically and horizontally layered porous media heated from the side

✍ Scribed by D. Poulikakos; A. Bejan

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 666 KB
• Volume: 26
• Category: Article
• ISSN: 0017-9310
• DOI: 10.1016/s0017-9310(83)80151-3

✦ Synopsis

The effect of nonun iform permeability and thermal d iffusivity on natural convection through a porous system heated from the side is investigated numerically. The first part of the study, in Section 2, focuses on systems composed of vert ical sublayers. It is shown that the heattransferrate is influenced substantially by the thickness and permeability of the peripheral sublayers adj acent to the heated vertical walls. The he at transfer results are correlated by using the ratio of peripheral sublayer th ickness divided by the boundary layer th ickness based on peripheral sublayer properties. The second part of th e study, in Section 3, deals with porous systems composed of horizontal sublayers with different perrncabilities. It is shown that due to the lack of homogeneity the vertical walls of the system are lined by boundary layers whose thicknesses vary from one sublayer to the next. A general heat transfer scaling law for horizontally layered systems is reported. 1'\O:\tEI"CLATURE C p fluid specific heat at constant pressure d subl ayer thickness g gravitational acceleration G dimensionless group for hor izontally-layered systems, equation (26)