Drying of a tape-cast layer: Numerical modelling of the evaporation process in a graded/layered material

Mirmasoud Jabbaribehnam, V. A. Jambhekar, Jesper Henri Hattel, R. Helmig

Research output: Contribution to journalJournal articleResearchpeer-review

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 (dp) — which directly affects the intrinsic permeability (K) based on the well-known Ergun's equation — of each single ceramic layer on the drying behaviour of a graded/layered ceramic.
Original languageEnglish
JournalInternational Journal of Heat and Mass Transfer
Volume103
Pages (from-to)1144-1154
ISSN0017-9310
DOIs
Publication statusPublished - 2016

Keywords

  • Darcy's law
  • Drying
  • Graded/layered materials
  • Porous media
  • Tape casting

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