Residence Time Distribution in Mixed-Flow Grain Dryers

Unfavorable design of mixed-flow dryers can affect broad residence time distributions, causing nonuniform drying. To simulate particle movement, a two-dimensional model based on the discrete element method (DEM) was developed using the commercial software Particle Flow Code PFC-2D (Itasca Consulting...

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Bibliographic Details
Published in:Drying technology 2011-01, Vol.29 (11), p.1252-1266
Main Authors: Iroba, K. L., Weigler, F., Mellmann, J., Metzger, T., Tsotsas, E.
Format: Article
Language:English
Subjects:
Design engineering
Differential equations
Discrete element method
Driers
Drying
Drying agents
Fluid dynamics
Grain flow
Inhomogeneities
Mathematical models
Mixed-flow dryer
Particle velocity
Residence time
Residence time distribution
Software
Two dimensional
Velocity
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Summary:Unfavorable design of mixed-flow dryers can affect broad residence time distributions, causing nonuniform drying. To simulate particle movement, a two-dimensional model based on the discrete element method (DEM) was developed using the commercial software Particle Flow Code PFC-2D (Itasca Consulting Group, Inc., Minneapolis, MN). The residence time analysis was employed to detect flow inhomogeneities and design deficits. The influences of structural parameters were considered by evaluating particle velocity and residence time distributions. Model validation in a semi-technical test dryer revealed that the 2D DEM model is very successful in predicting the particle flow patterns, so that it can be used to improve the dryer design.
ISSN:0737-3937
1532-2300
DOI:10.1080/07373937.2011.591711