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Received July 1, 2003
Accepted August 25, 2003
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Drying Characteristics of Particles using Thermogravimetric Analyzer
Yeong-Sung Park
Hyun Nam Shin
Dong Hyun Lee1†
Duk Joon Kim1
Ji-Heung Kim1
Young Kwan Lee1
Sang Jun Sim1
Kyong-Bin Choi2
Department of Environment Engineering, Daejeon University, Daejeon 300-716, Korea 1Department of Chemical Engineering, SungKyunKwan University, Suwon 440-746, Korea 2Industry Furnace Research Team, KIER, Daejeon 305-343, Korea
dhlee@skku.edu
Korean Journal of Chemical Engineering, November 2003, 20(6), 1170-1175(6), 10.1007/BF02706957
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Abstract
The drying characteristics (critical moisture content, equilibrium moisture content, constant drying rate and effective diffusivity) of various particles (gypsum, millet, polyvinyl chloride and silica gel) using a thermogravimetric analyzer were measured. The experiments were performed in the gas temperature range of 40 to 100 ℃ under isothermal conditions. The drying rate curve was mainly dependent on the moisture content, particle size, gas temperature and the internal structure of the solid particles. The equilibrium moisture content of solid particles decreased with increasing gas temperature, while the critical moisture content and the effective dispersion coefficient increased with increasing gas temperature. The effective diffusion coefficients of both PVC and gypsum particles were not able to be determined by Fick’s law since the experimental data were not well matched with the model predicted values, which consisted of the drying time in the falling-rate drying period.
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References
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Crank J, "The Mathematics of Diffusion," Oxford University Press, Oxford (1967)
Davidson JF, Thorpe RB, Al-Mansoori O, Kwong H, Peck M, Williamson R, Chem. Eng. Sci., 56(21-22), 6089 (2001)
Kannan CS, Rao SS, Varma YB, Ind. Eng. Chem. Res., 33(2), 363 (1994)
Kannan CS, Thomas PP, Varma YB, Ind. Eng. Chem. Res., 34(9), 3068 (1995)
Keey RB, "Introduction to Drying Operations," Pergamon Press, Oxford (1978)
Kunii D, Levenspiel O, "Fluidization Engineering," Butterworth-Heinemann Publication, Boston (1991)
Lee DH, Kim SD, Chem. Eng. Technol., 16, 263 (1993)
Lee DH, Kim SD, Chem. Eng. Technol., 22(5), 443 (1999)
Luikov AV, "Drying Technology," Energia, Moscow (1968)
Moyers CG, King CJ, "Drying-Relating Principles to Design," AIChE Continuing Education Series (1988)
Mujumdar AS, Davahastin S, "Applications for Fluidized Bed Drying," Handbook of Fluidization and Fluid-Particle Systems, Chap. 18, Eds. W.C. Yang, Marcel Dekker Inc., New York (2003)
Reay D, Baker CG, "Drying," Fluidization, Davidson, J.F., Clift, R. and Harrison, D., Eds., Academic Press (1985)
Strumillo C, Kudra T, "Drying: Principles, Applications and Design," Gordon and Breach Science Publishers, New York (1986)
Van Brakel J, Heertjes PM, Int. J. Heat Mass Transf., 17, 1093 (1974)
Zahed AH, Zhu JX, Grace JR, Drying Technol., 13, 1 (1995)
