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 °C 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
Ashworth, J. C. and Carter, J. W., “Examination of Drying Behaviour of Silica-Gel Granules by Continuous Weighing in an Airstrean,” Drying 1980, Vol. 1, Mujumdar, A. S., Ed., Hemisphere Publishing Corp., London (1980).
Arnaldos, I, Kozanoglu, B. and Casal, J., “Vacuum Fluidization: Application to Drying,” Fluidization, IX, Fan, L. S. and Knowlton, T. M., Eds., New York, Engineering Foundation (1998).
Bird, R. B., Stewart, W. E. and Lightfoot, E. N, “Transport Phenomena,,” John Wiley, New York (2002).
Choi, K. B., Park, S. I., Park, Y S., Sung, S. W. and Lee, D. H., “Drying Characteristics of Millet in a Continuous Multistage Fluidized Bed,,”Korean J. Chem. Eng.,19,1106 (2002).
Crank, I, “The Mathematics of Diffusion,” Oxford University Press, Oxford (1967).
Davidson, J. E, Thorpe, R. B., Al-Mansoori, O., Kwong, H, Peck, M. and Williamson, R., “Evaporation of Water from Air-Fluidized Porous Particles,”Chem Eng. Sci.,56, 6089 (2001).
Kaiman, C. S., Rao, S. S. and Verma, Y. B. G., “A Kinetic Model for Drying of Solids in Batch Fluidized Beds,”Ind. Eng. Chem. Res.,33, 363 (1994).
Kannan, C. S., Thomas, P. P. and Verma, Y B. G., “Drying of Solids in Fluidized Beds,”Ind. Eng. Chem. Res.,34, 3068 (1995).
Keey, R. B., “Introduction to Drying Operations,” Pergamon Press, Oxford (1978).
Kunii, D. and Levenspiel, O., “Fluidization Engineering,” Butterworth-Heinemann Publication, Boston (1991).
Lee, D. H. and Kim, S. D., “Drying Characteristics of Starch in an Inert Medium Fluidized Bed,”Chem. Eng, Technol.,16, 263 (1993).
Lee, D. H. and Kim, S. D., “Mathematical Model for Batch Drying in an Inert Medium Fluidized Bed,”Chem. Eng. Technol.,22, 443 (1999).
Luikov, A. V, “Drying Technology,” Energia, Moscow (1968).
Moyers, C. G. and King, C. J., “Drying-Relating Principles to Design,,” AIChE Continuing Education Series (1988).
Mujumdar, A. S. and 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. and Baker, C. G, “Drying,,” Fluidization, Davidson, J. E, Gift, R. and Harrison, D., Eds., Academic Press (1985).
Strumillo, C. and Kudra, T., “Drying: Principles, Applications and Design,” Gordon and Breach Science Publishers, New York (1986).
VanBrakel J., and Heertjes, P. M., “Analysis of Diffusion in Macroporous Media in Terms of a Porosity, a Tortuosity and a Constrictivity Factor,”Int. J. Heat and Mass Transfer,17, 1093 (1974).
Zahed, A. H., Zhu, J. X. and Grace, J. R., “Modeling and Simulation of Batch Fluidized Bed Dryers,”Drying Technology,13, 1 (1995).
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Park, YS., Shin, H.N., Lee, D.H. et al. Drying characteristics of particles using thermogravimetric analyzer. Korean J. Chem. Eng. 20, 1170–1175 (2003). https://doi.org/10.1007/BF02706957
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DOI: https://doi.org/10.1007/BF02706957