Extending potential flow modelling of flat-sheet geometries as applied in membrane-based systems
| Autor: | Johannes D. Stigter, Jan W. Post, Joost Veerman, M.H. Dirkse, W.K.P. van Loon, G.P.A. Bot |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
mass-transport
reverse electrodialysis Coordinate system Flow (psychology) Analytical chemistry Filtration and Separation Residence time (fluid dynamics) Biochemistry power General Materials Science Physical and Theoretical Chemistry Diffusion (business) WIMEK Chemistry Space time Mechanics Leerstoelgroep Meet- regel- en systeemtechniek Residence time distribution Systems and Control Group regel- en systeemtechniek Environmental Technology Potential flow Vector field Milieutechnologie Leerstoelgroep Meet energy |
| Zdroj: | Journal of Membrane Science 325 (2008) 2 Journal of Membrane Science, 325(2), 537-545 |
| ISSN: | 0376-7388 |
| Popis: | The efficiency of chemical reactors can be analysed using the residence time distribution. This research focusses on flat-sheet geometries applied in membrane-based systems. The residence time distribution depends mainly on the 2D velocity field, parallel to the membrane. The velocity average over the transversal direction is calculated using potential flow theory. A combination of real and virtual sources and sinks are used to model the internal inlets and outlets. Furthermore, a novel method is presented to calculate the residence time distribution. By ignoring diffusion and dispersion, every streamline is modelled to have a fixed residence time, which can be calculated with a simple quadrature based on a coordinate transformation. The model predicts the impact of the two-dimensional geometry on the residence time distribution, but it is demonstrated that large zones of nearly stagnant flow have only a limited impact on the residence time distribution. The new model can predict the travelling time from the inlet to each interior location, providing a better tool to analyse spatially distributed chemical reactions. The models agreed highly with pressure measurements (R2 = 0.94¿0.98) and they agreed well with tracer experiments for the residence time (R2 = 0.73¿0.99). |
| Databáze: | OpenAIRE |
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