| Автор | Wang, E.Y. |
| Автор | Cameron, I.T. |
| Автор | Lister, I.D. |
| Автор | Dougla, P L |
| Дата выпуска | 1993 |
| dc.description | ABSTRACTA nonequilibrium distributed parameter model for rotary drying and cooling processes described by a set of partial differitial equations with nonlinear algebraic constraints is developed in this work. These equations arise from the multi–phase heat and mass balances on a typical rotary dryer. A computational algorithm is devekped by employing a polynonial approximation ( orthogonal collocation) with a glotal splinc technique leading to a differential–algebraic equation ( DAE) system. The numerical solution is carried out by using a standard DAE solver.The two– phase–flow heat transfer coelficient is computed by introducing a correction factor to the commonly accepted correlations. Since interaction between the falling particles are considered in the correction factor,the results are more reliable than those computed by assuming that heat transfer between a single falling particle and the drying air is unaffected by other particles. The heat transfer computations can be further justified via a study on the analogies between heat and mass transfer.The general model devloped in this work is mathematically more ritorous yet more flexible that the lumped parameter models established by one of the authors (Douglas et al., (1993)). The three major assumptions of an equilibrium operation, perfect mixing and constant drying raic, are removed in the distributed parameter model.The simulation results are compared with the operational data from an industrial sugar dryer and predictions from earlier models. The model and algorithm successfully predict the steady state behaviour of rotary dryers and collers. The generalized model can be applied to fertilizer drying processes in which the assumption of constant drying rate is no longer valid and the existing dynamic models are not applicable. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | rotary dryers |
| Тема | dynamic modelling |
| Тема | orthogonal collocation |
| Название | A DISTRIBUTED PARAMETER APPROACH TO THE DYNAMICS OF ROTARY DRYING PROCESSES |
| Тип | research-article |
| DOI | 10.1080/07373939308916922 |
| Electronic ISSN | 1532-2300 |
| Print ISSN | 0737-3937 |
| Журнал | Drying Technology |
| Том | 11 |
| Первая страница | 1641 |
| Последняя страница | 1656 |
| Аффилиация | Wang, E.Y.; Department of Chemical Engineering, Tha University of Queensland.Brisbawre |
| Аффилиация | Cameron, I.T.; Department of Chemical Engineering, Tha University of Queensland.Brisbawre |
| Аффилиация | Lister, I.D.; Department of Chemical Engineering, Tha University of Queensland.Brisbawre |
| Аффилиация | Dougla, P L; Department of Chemical Engineering, Tha University of Watertoo |
| Выпуск | 7 |
