Abstract
Evaporation of water from a ceramic layer is a key phenomenon in the drying process for the manufacturing of water-based tape cast ceramics. In this paper we present a coupled free-flow-porous-media model on the Representative Elementary Volume (REV) scale for coupling non-isothermal multi-phase compositional porous-media flow — for the ceramic layer — and single-phase compositional laminar free flow — for the air above it. The preliminary results show the typical expected evaporation behaviour from a porous medium initially saturated with water, and water–vapour transport to the free-flow region in accordance with the available results from the literature. We elaborate on and discuss the characteristic drying-rate curve for a single layer ceramic, and compare it with that of a graded/layered ceramic. We, moreover, show the influence of the mean diameter of particles of the porous medium () — which directly affects the intrinsic permeability () based on the well-known Ergun’s equation — of each single ceramic layer on the drying behaviour of a graded/layered ceramic.
| Original language | English |
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| Pages (from-to) | 1144-1154 |
| Number of pages | 11 |
| Journal | International Journal of Heat and Mass Transfer |
| Volume | 103 |
| Early online date | 28 Aug 2016 |
| Publication status | Published - 2016 |