Solidification by convective drying of particle layer wetted with dilute agar gel

Hironobu Imakoma*, Kazuya Kubo, Hiroshi Yoshiba, Masamichi Yoshida

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Solidified porous slab is formed through convective drying of glass particle layer wetted with aqueous dilute agar gel. Measured critical mean moisture content increases with increasing initial moisture or agar content. The agar gel moves in viscous flow caused by capillary pressure during drying. A new drying model based on the receding evaporation plane model is proposed. Drying period is divided into surface and internal vaporation periods. Wet slab consists of dried and wet zones during the internal evaporation period, while the wet slab consists of wet zone only during the surface evaporation period. In the new model, the evaporation rate from the wet zone in the internal drying period is estimated with the linear driving force (LDF) approximation in the field of adsorption engineering. Critical moisture content, that is, mean moisture content between the surface and internal periods, is estimated with a mass balance on the surface. Simulated results by the new drying model with reasonable fitting parameters agree very well with measured drying data.

Original languageEnglish
Pages (from-to)1303-1318
Number of pages16
JournalDrying Technology
Volume23
Issue number6
DOIs
StatePublished - 2005

Keywords

  • Agar gel
  • Convective drying
  • Critical moisture content
  • Glass particle layer
  • Receding evaporation plane

ASJC Scopus subject areas

  • General Chemical Engineering
  • Physical and Theoretical Chemistry

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