Effect of the Re number on heat and mass transport in a catalytic monolith
The numerical investigation of inter-phase heat transfer in a catalytic combustor, under laminar flow regime at different values of the Re number, is performed by means of a 2D axi-symmetric model of a single monolith channel. Numerical results highlight that axial diffusion comes to play an importa...
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Published in | Catalysis today Vol. 117; no. 4; pp. 498 - 505 |
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Main Authors | , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Amsterdam
Elsevier B.V
15.10.2006
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | The numerical investigation of inter-phase heat transfer in a catalytic combustor, under laminar flow regime at different values of the
Re number, is performed by means of a 2D axi-symmetric model of a single monolith channel. Numerical results highlight that axial diffusion comes to play an important role in the ignition region also at high convective fluxes (high
Re) due to the strong flow perturbation accompanying light-off, with the consequences that: (a) the ignition position is not a linear function of contact time, as it would be expected at high
Re; (b) the heat and mass transfer between surface and bulk gas phase are non-linearly affected by
Re, especially in the entrance and in the ignition regions.
A previously developed correlation for
Nu and
Sh is, hence, extended to include the effect of the
Re number on heat and mass fluxes, enabling the prediction of the local value of
Nu and
Sh in the main features, and in particular the enhancement in the ignition region and the dependence on
Re. |
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ISSN: | 0920-5861 1873-4308 |
DOI: | 10.1016/j.cattod.2006.06.005 |