Advanced search
1 file | 1.61 MB

Coupling CFD and diffusion models for analyzing the convective drying behavior of a single rice kernel

(2014) DRYING TECHNOLOGY. 32(3). p.311-320
Author
Organization
Abstract
The drying behavior of a single rice kernel subjected to convective drying was analyzed numerically by solving heat and moisture transfer equations using a coupled CFD and diffusion model. The transfer coefficients were computed simultaneously with the external flow field and the internal diffusive field of the grain. The model was validated using results of a thin-layer drying experiments from literature. The effects of velocity and temperature of the drying air on the rice kernel were analyzed. It was found that the air temperature was the major variable that affected the drying rate of the rice kernel. The initial drying rates (in first 20 min) were 7%, 12% and 19% per hour at inlet air temperature of 30ºC, 45ºC, and 60ºC, respectively. Important temperature gradients within the grain existed only in the first few minutes of the drying process. The moisture content gradients reached a maximum value of 11.7% [d.b.].mm-1 at approximately 45 min along the short axis in the thickness direction. The variation of the inlet air velocity showed a minor effect on the drying rate of the rice kernel. The heat and mass transfer coefficients varied from 16.57 to 203.46 W•m-2•K-1 and from 0.0160 to 0.1959 m•s-1, respectively. The importance of the computation of the transfer coefficients with the heat and mass transfer model is demonstrated.
Keywords
Grain drying, CFD, Diffusion model, Mathematical modeling, Heat and mass transfer, MASS-TRANSFER, ROUGH RICE, NUMERICAL-SIMULATION, SIMULTANEOUS HEAT, SPOUTED-BED, BARLEY, DRYER, WHEAT

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 1.61 MB

Citation

Please use this url to cite or link to this publication:

Chicago
ElGamal, Ramadan, Frederik Ronsse, Sherif M Radwan, and Jan Pieters. 2014. “Coupling CFD and Diffusion Models for Analyzing the Convective Drying Behavior of a Single Rice Kernel.” Drying Technology 32 (3): 311–320.
APA
ElGamal, R., Ronsse, F., Radwan, S. M., & Pieters, J. (2014). Coupling CFD and diffusion models for analyzing the convective drying behavior of a single rice kernel. DRYING TECHNOLOGY, 32(3), 311–320.
Vancouver
1.
ElGamal R, Ronsse F, Radwan SM, Pieters J. Coupling CFD and diffusion models for analyzing the convective drying behavior of a single rice kernel. DRYING TECHNOLOGY. 2014;32(3):311–20.
MLA
ElGamal, Ramadan, Frederik Ronsse, Sherif M Radwan, et al. “Coupling CFD and Diffusion Models for Analyzing the Convective Drying Behavior of a Single Rice Kernel.” DRYING TECHNOLOGY 32.3 (2014): 311–320. Print.
@article{4245411,
  abstract     = {The drying behavior of a single rice kernel subjected to convective drying was analyzed numerically by solving heat and moisture transfer equations using a coupled CFD and diffusion model. The transfer coefficients were computed simultaneously with the external flow field and the internal diffusive field of the grain. The model was validated using results of a thin-layer drying experiments from literature. The effects of velocity and temperature of the drying air on the rice kernel were analyzed. It was found that the air temperature was the major variable that affected the drying rate of the rice kernel. The initial drying rates (in first 20 min) were 7\%, 12\% and 19\% per hour at inlet air temperature of 30{\textordmasculine}C, 45{\textordmasculine}C, and 60{\textordmasculine}C, respectively. Important temperature gradients within the grain existed only in the first few minutes of the drying process. The moisture content gradients reached a maximum value of 11.7\% [d.b.].mm-1 at approximately 45 min along the short axis in the thickness direction. The variation of the inlet air velocity showed a minor effect on the drying rate of the rice kernel. The heat and mass transfer coefficients varied from 16.57 to 203.46 W{\textbullet}m-2{\textbullet}K-1 and from 0.0160 to 0.1959 m{\textbullet}s-1, respectively. The importance of the computation of the transfer coefficients with the heat and mass transfer model is demonstrated.},
  author       = {ElGamal, Ramadan and Ronsse, Frederik and Radwan, Sherif M and Pieters, Jan},
  issn         = {1532-2300},
  journal      = {DRYING TECHNOLOGY},
  language     = {eng},
  number       = {3},
  pages        = {311--320},
  title        = {Coupling CFD and diffusion models for analyzing the convective drying behavior of a single rice kernel},
  url          = {http://dx.doi.org/10.1080/07373937.2013.829088},
  volume       = {32},
  year         = {2014},
}

Altmetric
View in Altmetric
Web of Science
Times cited: