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Received March 13, 2007
Accepted July 5, 2007
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A numerical study on drying of porous media
Faculty of Eng., The University of Guilan, P. O. Box 3756, Rasht, Iran
Haghi@Guilan.ac.ir
Korean Journal of Chemical Engineering, March 2008, 25(2), 191-198(8), 10.1007/s11814-008-0035-0
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Abstract
In this study, two-dimensional conjugate heat and mass transfer in porous body and drying air during the drying process were numerically investigated by finite volume (FV) method, which guarantees the conservation of mass, momentum and the energy during the numerical solution. The full NS-equations (including buoyancy terms), energy equation and concentration equation are considered for external flow and for porous field coupled energy and moisture transfer equations are used. The numerically captured curve shows the same behavior of the drying process. Drying flow velocity shows proportional effect on moisture removal rate with a factor between 1/4 and 1/5 in Reynolds range of 50 to 1,000. Also, buoyancy forces have an effect on flow streamlines, the distribution of vapor concentration, moisture profile, and considerably increase drying rate. This increment was investigated in Reynolds number range of 50 to 1,000, and its minimum value was found in a Reynolds number of 1,000, which was about 15 percent.
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Luikov AV, Heat and mass transfer in capillary-porous bodies, Pergamon Press (1966)
Whitaker S, Advances in Heat Transfer, 13, 119 (1977)
Ben Nasrallah S, Perre P, Int. J. Heat Mass Transf., 31(5), 297 (1988)
Murugesan K, Seetharamu KN, Narayana PAA, Heat and Mass Transfer, 32, 81 (1996)
Ferguson WJ, Lewis RW, A comparison of a fully non-linear and a partially non-linear heat and mass transfer of a timber drying problem, Proceedings of 7th Conf. on Numerical methods, in Thermal Problems, VII, Part 2, 973 (1991)
Comini G, Lewis RW, Int. J. Heat Mass Transfer, 19, 1387 (1976)
Dolinskey AA, Dorfman AS, Davidenko BV, Int. J. Heat Mass Transfer, 34, 11 (2883)
Masmoudi P, Prat M, Int. J. Heat Mass Transf., 34(8), 1975 (1991)
Oliveira LS, Haghighi K, Numerical Heat Transfer, 34, 105 (1998)
Murugesan K, Suresh HN, Seetharamu KN, Narayana PAA, Numerical Heat Transfer, 44, 21 (2001)
Younsi R, Kocaefe D, Poncsak S, Kocaefe Y, Appl. Therm. Eng., doi:10.1016 (2006)
Suresh HN, Murugesan K, Narayana PA, Seetharamu KN, Drying of porous material using finite element method, 2nd Int. Conf. on CFD in minerals and process industries, Melbourne, Australia (1999)
Yeo YK, Hwang KS, Yi SC, Kang H, Korean J. Chem. Eng., 21(4), 761 (2004)
