Drying of Liquid Dispersions—A Unified Approach to Kinetics and Modeling
2003; Taylor & Francis; Volume: 21; Issue: 6 Linguagem: Inglês
10.1081/drt-120021872
ISSN1532-2300
AutoresВ. И. Коновалов, N. Z. Gatapova, Tadeusz Kudra,
Tópico(s)Mechanical and Thermal Properties Analysis
ResumoAbstract The article presents a unified approach to interpretation of drying kinetics and modeling of the drying process for suspensions, solutions, emulsions and pastes. The approach is based on phenomenological analysis of temperature-moisture relationships T(X) with account for temperature plateaux that actually show-up, or could exist under certain drying conditions. In addition, a unified mathematical model is proposed that includes the differential equations for mass and heat diffusion along with their analytical solutions for a multi-layer plate, cylinder and sphere. Interconnections in the simultaneous heat-mass transfer, cross-effects and any other details of a real process are taken into account separately, by semi-empirical temperature-moisture function T(X). The principles of piece-wise multizone approximation of these temperature-moisture curves are presented. The hyperbolic and two-arc approximations for each separate zone are described. The set of 12 organic and inorganic materials either synthetic or of animal and plant origin such as meat processing sludge, heavy corn steep water, gelatin, starch, sugar, salt, combined latex emulsion, P-salt, gamma acid, dispersing and bleaching agents was taken as example for the development and validation of this approach. Keywords: EmulsionMultizone approximationOne-zone approximationsPasteSolutionSuspensionTemperature-moisture relationships Acknowledgment The support of our colleagues from Tambov State Technical University, SH Co. “Pigment” and CANMET is greatly appreciated. Notes aDetails of experiments, data interpretation, and model solutions are given in dissertations by Korobov V. B., Tugolukov E. N., Gatapova N. Z., Sergeeva E. A., Pachomov A. N., Koliuch A. N., and Korobova I. L. These studies are ongoing, with the following postgraduates and collaborators of Prof. Konovalov: Shikunov A. N., Utrobin A. N., Michailov B. N., and Kozlov D. V
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