Comparison of residence time models for cascading rotary dryers

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Drying Technology

DOI:https://doi.org/10.1080/07373939908917572· OSTI ID:355710

Cao, W F; Langrish, T A.G. ^[1]

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1. Univ. of Sydney, New South Wales (Australia). Dept. of Chemical Engineering

The predictions of the models of Matchett and Baker (1988), Saeman and Mitchell (1954) and Friedman and Marshall (1949) for the solids residence time in rotary dryers have been compared with both pilot-scale and industrial-scale data. A countercurrent pilot-scale dryer of 0.2m diameter and 2m long has been used with air velocities up to 1.5 m to measure the residence times of sorghum grain. The average discrepancy for the solids residence time between the predictions and the experiments that were carried out in the pilot-scale rotary dryer is {minus}10.4%. Compared with the models of Friedman and Marshall (1949) and Saeman and Mitchell (1954) for the pilot-scale data obtained here, the Matchett and Baker model is more satisfactory for predicting the solids residence time in this pilot-scale dryer. It has also been found that the model of Matchett and Baker describes the industrial data of Saeman and Mitchell (1954) than the correlation of Friedman and Marshall (1949).

• Sponsoring Organization: USDOE
• OSTI ID: 355710
• Journal Information: Drying Technology, Journal Name: Drying Technology Journal Issue: 4-5 Vol. 17; ISSN 0737-3937; ISSN DRTEDQ
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COMPARATIVE EVALUATIONS
DESIGN
DRYERS
MATHEMATICAL MODELS
SOLIDS FLOW
TIME DEPENDENCE
VALIDATION