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Flow and Heat Transfer Within Segregated Beds of Solid Particles

Volume 4, Issue 3, 2001, 10 pages
DOI: 10.1615/JPorMedia.v4.i3.20
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ABSTRACT

A model for the transient fluid flow and heat transfer within an axially symmetrical circular cylindrical packed bed of solids containing two different layers of porous matrices is described. The system relates to a cylindrical packed bed fitted with an axial core of a porous matrix that is different from the surrounding cylindrical shell. The influence of permeability ratio (0.0625−16) and Reynolds number (1000 and 2000) on the thermal wave propagation is described. A hot stream of dry air is forced to flow axially at the inlet to the bed. The numerically predicted results are validated against experimental data obtained in a small laboratory test rig 63 mm in diameter and 120 mm in length that is packed with uniform diameter spherical glass beads (3−12 mm in diameter). An analytical model was also developed to estimate the velocity in the bed and compared with the value obtained from the numerical solution of the volume-averaged Navier-Stokes equation. The results are presented for Reynolds numbers of 1000 and 2000. It is found that for a highly fractured core, the heat diffuses radially, while for a low permeability core the heat transfer takes place by advection and diffusion. In the latter case, the Reynolds number has a significant effect on the rate of heat transfer.

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