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Stability of the Dynamical System describing Isothermal Gas-Phase-Controlled Drying of Ternary Mixtures
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. (Drying & Process Technology)
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Transport Phenomena. (Drying & Process Technology)
1998 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 16, no 9-10, 1807-1825 p.Article in journal (Refereed) Published
Abstract [en]

A stability analysis of the ordinary differential equations describing the process of convective gas-phase-controlled evaporation during drying of ternary mixtures was performed. The case considered was that of a gas flowing parallel to the surface of a flat solid, wetted with a liquid mixture, during drying at constant gas conditions. If evaporation is isothermal, the solutions of a system of ODEs are the trajectories in the phase plane represented by a triangular diagram of compositions. Analysis of the ternary mixture showed that the predicted ternary dynamic azeotropes were unstable nodes and composition trajectories moved away from them. On the other hand, some of the binary azeotropes could be stable nodes. Nodes represented by pure components could be either stable or unstable. Loading the gas with one of the components might give rise to additional critical points and might reverse or change the stability of the previous ones. The present stability analysis permits the prediction of the trajectories and final state in a gas-phase-controlled drying process. It is of great importance due to the critical influence of the composition of the remaining moisture on the quality and properties of the final product.

Place, publisher, year, edition, pages
1998. Vol. 16, no 9-10, 1807-1825 p.
Keyword [en]
drying dynamics, isothermal drying, system stability, ternary system
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-102103DOI: 10.1016/S0009-2509(99)00171-2OAI: oai:DiVA.org:kth-102103DiVA: diva2:550835
Note
NR 20140805Available from: 2012-09-08 Created: 2012-09-08 Last updated: 2017-12-07Bibliographically approved

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