Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31097
Contact Drying Simulation of Particulate Materials: A Comprehensive Approach

Authors: Marco Intelvi, Apolinar Picado, Joaquín Martínez


In this work, simulation algorithms for contact drying of agitated particulate materials under vacuum and at atmospheric pressure were developed. The implementation of algorithms gives a predictive estimation of drying rate curves and bulk bed temperature during contact drying. The calculations are based on the penetration model to describe the drying process, where all process parameters such as heat and mass transfer coefficients, effective bed properties, gas and liquid phase properties are estimated with proper correlations. Simulation results were compared with experimental data from the literature. In both cases, simulation results were in good agreement with experimental data. Few deviations were identified and the limitations of the predictive capabilities of the models are discussed. The programs give a good insight of the drying behaviour of the analysed powders.

Keywords: Vacuum, Atmospheric Pressure, Agitated bed, Penetrationmodel

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1825


[1] I. Kemp, "Progress in dryer selection techniques," Drying Technol., vol. 17, pp. 1667-1680, 1999.
[2] N.V. Menshutina and T. Kudra, "Computer aided drying technologies," Drying Technol., vol. 19, pp. 1825-1850, 2001.
[3] E.U. Schl├╝nder and N. Mollekopf, "Vacuum contact drying of free flowing, mechanically agitated particulate material," Chem. Eng. Process., vol. 18, pp. 93-111, 1984.
[4] K. Malhotra and M. Okazaki, "Contact drying in mechanically agitated granular beds: a review of fundamentals," in Advances in Drying, vol. 5, A.S. Mujumdar, Ed. Washington: Hemisphere Publishing Corporation, 1992, pp. 325.
[5] M. Intelvi, "Contact drying of particulate pharmaceuticals: modelling and simulation," MSc thesis, Dept. of Chemical Engineering Principles and Practice "I. Sorgato, University of Padova, Padova, Italy, 2010.
[6] E. Tsotsas and E.U. Schl├╝nder, "Vacuum contact drying of free flowing mechanically agitated particulate multigranular packing," Chem. Eng. Process., vol. 20, pp. 339-349, 1986.
[7] E. Tsotsas and E.U. Schl├╝nder, "Vacuum contact drying of mechanically agitated beds: the influence of hygroscopic behaviour on the drying rate curve," Chem. Eng. Process., vol. 21, pp. 199-208, 1987.
[8] R. Forbert and E. Heimann, "Vacuum contact drying of mechanically agitated: coarse, hygroscopic, bulk material," Chem. Eng. Process., vol. 26, pp. 225-235, 1989.
[9] F. Heimann and E.U. Schl├╝nder, "Vacuum contact drying of mechanically agitated granulate beds wetted with a binary mixture," Chem. Eng. Process., vol. 24, pp. 75-91, 1988.
[10] D. Farges, M. Hemati, C. Laguérie, F. Vachet and P. Rousseaux, "A new approach to contact drying modeling," Drying Technol., vol. 13, pp. 1317-1329, 1995.
[11] A. Dittler, T. Bamberger, D. Gehrmann and E.U. Schl├╝nder, "Measurement and simulation of the vacuum contact drying of pastes in a LIST-type kneader drier," Chem. Eng. Process., vol. 36, pp. 301-308, 1997.
[12] E. Tsotsas and E.U. Schl├╝nder, "Contact drying of mechanically agitated particulate material in the presence of inert gas," Chem. Eng. Process., vol. 20, pp. 277-285, 1986.
[13] A. Gevaudan and J. Andrieu, "Contact drying modeling of agitated porous media beds," Chem. Eng. Process., vol. 30, pp. 31-37, 1991.
[14] P. Arlabosse and T. Chitu, "Identification of the limiting mechanism in contact drying of agitated sewage sludge," Drying Technol., vol. 25, pp. 557-567, 2007.
[15] R.C. Reid, J.M. Prausnitz and B. Poling, The Properties of Gases and Liquids, 4th ed. Washington, USA: McGraw-Hill Companies, 1987.
[16] E.U. Schlünder, "Wärmeübergang an bewegte Kugelschüttungen bei kurzfristigem Kontakt," Chem. Ing. Tech., vol. 43, pp. 651-654, 1971.
[17] P. Zhener, "Experimentelle und theoretische Bestimmung der effektiven W├ñrmeleitf├ñhigkeit durchströmter Kugelsch├╝ttungen bei m├ñßigen und hohen Temperaturen," Dr.-Ing. Thesis, Institut f├╝r Thermische Verfahrenstechnik, Universit├ñt Karlsruhe, Karlsruhe, 1972.
[18] R. Bauer, "Effektive radiale W├ñrmeleitf├ñhigkeit gasdurchströmter Sch├╝ttungen mit Partikeln unterschiedlicher Form und Größenverteilung," Dr.-Ing. Thesis, Institut f├╝r Thermische Verfahrenstechnik, Universit├ñt Karlsruhe, Karlsruhe, 1976.
[19] O. Krischer and W. Kast, Die wissenschaftlichen Grundlagen der Trocknungstechnik. Berlin: Springer-Verlag GmbH, 1978.
[20] R.J. Gummow and I. Sigalas, "The thermal conductivity of talc as a function of pressure and temperature," Int. J. Thermophysics, vol. 9, pp. 1111-1120, 1988.
[21] A. Michot, D.S. Smith, S. Degot and C. Gault, "Thermal conductivity and specific heat of kaolinite: Evolution with thermal treatment," J. Eur. Ceram. Soc., vol. 28, pp. 2639-2644, 2008.