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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Moisture diffusivity of rough rice under infrared radiation drying
LWT, Volume 44, No. 4, Year 2011
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Description
To design efficient infrared (IR) dryers for rough rice, it is important to understand the drying behavior of rough rice under IR heating. The objective of this study was to determine the moisture diffusivity of rough rice under IR heating followed by cooling. The effects of initial moisture content, rice temperature, drying bed thickness, tempering, and cooling methods on moisture diffusivity and moisture diffusivity coefficient were investigated. Samples of freshly harvested medium grain rice (M202 variety) with initial moisture content (MC) of 25.8, 31.2 and 33.8g moisture/100g dry solid were used. They were dried with IR radiation intensity of 5348W/m2, for six exposure times, 15, 30, 40, 60, 90 and 120 s. The tested drying bed thicknesses were single-layer, 5mm and 10mm. The unsteady diffusion equation based on Fick's law and slope methods were used to describe moisture diffusivity. The results indicated that rough rice moisture diffusivities under IR heating and cooling were significantly affected by rice temperature and tempering treatment, respectively. High heating rate and moisture diffusivity were achieved with IR heating. It took only 60, 90 and 120 s to achieve about 60°C rice temperature with corresponding moisture diffusivities of 4.8 × 10-9, 3.6 × 10 -9 and 3.4 × 10-9 m2/s during heating for drying bed thicknesses of a single layer, 5mm and 10mm, respectively. The moisture diffusivity coefficients during heating and cooling of IR dried rice with tempering were much higher than those of convective drying, which reflected the high drying rate of the IR drying method. © 2010.
Authors & Co-Authors
Khir, Ragab
United States, Davis
University of California, Davis
Egypt, Ismailia
Faculty of Agriculture
Pan, Zhongli J.
United States, Davis
University of California, Davis
United States, Albany
Usda Ars Western Regional Research Center Wrrc
ElSayed, Adel
Egypt, Ismailia
Faculty of Agriculture
Hartsough, Bruce R.
Egypt, Ismailia
Faculty of Agriculture
Mohamed, Sherief
Egypt, Ismailia
Faculty of Agriculture
Statistics
Citations: 103
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/j.lwt.2010.10.003
ISSN:
00236438
Research Areas
Cancer