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Abstract

The paper describes paddy grain (rice) drying in a pneumatic conveyor where gas–particle heat and mass
transfer occur simultaneously with transporting and drying operations. A one-dimensional macroscopic
drying model of the overall bed incorporating mass and energy balances and drying kinetics of moisture
diffusion inside the paddy grain is developed. The set of coupled non-linear ordinary differential equations is
solved numerically to illustrate the evolution of moisture and temperature of the paddy grain and air stream
throughout the dryer length. The effect of specific airflow rate, which depends on dryer diameter, paddy feed
rate and inlet-air velocity on the final moisture content, and temperature of paddy grain and air stream is
studied. The feasibility of paddy drying in a pneumatic conveyor is evaluated using the developed model. This
device is found impractical for drying of hygroscopic material such as paddy grain because of the low solid
residence time for dryers of reasonable size.

Item Type:	Article
Authors/Creators:	Bunyawanichakul, P and Walker, GJ and Sargison, JE and Doe, PE
Keywords:	Grain drying, heat and mass transfer, paddy drying
Journal or Publication Title:	Biosystems Engineering
ISSN:	1537-5110
DOI / ID Number:	10.1016/j.biosystemseng.2006.11.004
Additional Information:	The definitive version is available online at http://www.sciencedirect.com/
Item Statistics:	View statistics for this item

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