An overview of approaches of modelling transport phenomena in mixed-flow dryers
2009
Djakovic, D., Faculty of Technical Sciences, Novi Sad (Serbia) | Dimic, M., Faculty of Technical Sciences, Novi Sad (Serbia)
An analysis of different approaches to mathematical modelling of mixed-flow grain dryers is shown in this paper. The paper presents the governing equations describing transport phenomena in the models of the drying process in the dryers with mixed flows of drying agents and grain material and the comments connected with the applicability of some of the assumption and the solving methods for some of the analyzed cases. The analysis starts with the basic classification into deterministic and stochastic models, followed by a review of models, lumped parameter and distributed parameter models. The limitations of different levels are given, concerning mostly the ways of flow of the drying agents and the dried material, dominant type of transport phenomena in certain phases or resistance to some of the types of transport phenomena in one or more available phases in the dried material. The article also presents a review based on different assumptions and simplifications made in order to enable solving of the reviewed model, as well as the problems connected to establishment of different parameters used in the governing equations. There is also an attempt of systematization of the existing models together with the authors comments on the existing applications. A review of mathematical methods available for solving reviewed models, together with the availability for use of some of them is given, as well.
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