Mathematical modelling of indirect contact rotary dryers

Journal Article · Tue Sep 01 04:00:00 EDT 1998 · Drying Technology

DOI:https://doi.org/10.1080/07373939808917480· OSTI ID:675604

Shene, C; Bravo, S ^[1]

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1. Univ. de La Frontera, Temuco (Chile). Chemical Engineering Dept.

Two different approaches were used to predict the solid moisture content and solid temperature profiles along a continuous indirect contact rotary dryer heated with steam tubes. One of these uses heat and mass balances applied to the solid phase in a differential element of dryer length. Here the heat flux is computed through an overall heat transfer coefficient assumed constant. The other model is based on a previous work that calculates the heat transfer coefficient as a function of the time the solid particles are in contact with the heating surface. The advantage in using this second model lies in the fact that the effects of the operational conditions. If this coefficient has a strong dependence on these conditions, then it would be inappropriate to use a fixed value. Although both approaches can predict the solid moisture content and temperature profiles along the dryer differences were detected.

• Sponsoring Organization: USDOE
• OSTI ID: 675604
• Journal Information: Drying Technology, Journal Name: Drying Technology Journal Issue: 8 Vol. 16; ISSN 0737-3937; ISSN DRTEDQ
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
DRYERS
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL MODELS
MOISTURE
TEMPERATURE DISTRIBUTION