Heat and mass transfer in fixed-bed drying

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)4233-4243
Journal / PublicationChemical Engineering Science
Volume54
Issue number19
Publication statusPublished - 25 Jun 1999
Externally publishedYes

Abstract

The fixed-bed drying of moist porous particles is described mathematically with a comprehensive heat and mass transfer model. The temperature, moisture content and pressure distributions in a particle were considered in the model along with the conjugate effects between the gas and particles in the fixed-bed. After dividing the deep bed into a series of thin layers, the fixed-bed drying model is solved layer by layer with finite difference method. The thin-layer model includes both the external and internal resistances of heat and mass transfer for particles in the bed. The numerical results show that non-uniformity exists not only for the temperature and relative humidity of gas in the fixed-bed, but also for the temperature, moisture content and pressure in the material. The drying behavior of each layer is significantly affected by the non-uniformity of drying conditions along the bed height. The distributions of temperature and moisture content in the particle play a very important role in heat and mass transfer in the fixed-bed drying. However, the effect of pressure distribution on the drying process is negligible. The calculation shows that a drying front exists in the fixed bed and moves forward linearly with drying time. The drying efficiency is higher in deep-bed drying than in thin layer drying up to a certain bed height.

Research Area(s)

  • Deep bed, Mathematical modeling, Numerical method, Porous media, Thin layer

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Heat and mass transfer in fixed-bed drying. / Wang, Zhao Hui; Chen, Guohua.
In: Chemical Engineering Science, Vol. 54, No. 19, 25.06.1999, p. 4233-4243.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review