Abstract
The problem of boiling and dryout in a heat dissipating unconstricted particle bed is investigated. Two distinct but nevertheless related configurations of the system emerge and are examined separately. In the first chapter the packed bed configuration is treated. An unsteady multidimensional mathematical model is developed formulating the mass, momentum and energy conservation equations along with the constitutive relations common to multiphase flows in porous media and the resulting system is solved numerically in two dimensions. The model proves to be consistent in predicting the occurrence of dryout in in-pile packed beds. Under certain conditions some part or even the whole bed is traversed by discrete channels the presence of which affects the coolability of the system. It is the aim of the second chapter to study the behaviour of channels as well as their controversial effect on the dryout power. On the basis of an extensive experimental support, the formation, density, extent and stability of channels, are investigated leading to the development of a model for dryout in channeled beds. The link between dryout occurrence in packed and channeled beds becomes apparent and has to do with the relative extent of the channeled zone in the bed.
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© 1991 Springer Science+Business Media Dordrecht
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Stubos, A.K., Buchlin, JM. (1991). Boiling and Dryout in Unconsolidated Porous Media. In: Kakaç, S., Kilkiş, B., Kulacki, F.A., Arinç, F. (eds) Convective Heat and Mass Transfer in Porous Media. NATO ASI Series, vol 196. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3220-6_27
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DOI: https://doi.org/10.1007/978-94-011-3220-6_27
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