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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THREE-DIMENSIONAL NUMERICAL SIMULATION OF IONIC MECHANICAL DISPERSION IN AN ELECTRODIALYZER WITH NET-LIKE SPACERS

Get access (open in a dialog) DOI: 10.1615/IHTC16.pma.021758
pages 7969-7976

Resumo

Ion solutions flowing the channels filled with the net-like spacers in an electrodialyzer follow zig-zag flow paths. This phenomenon, namely, ionic mechanical dispersion, leads to a substantial increase in the effective mass transfer coefficient over the membrane surfaces, thus, retarding depletion of ions and increasing the value of the limiting current density, which is of great importance in practical applications. In this analytical and numerical study, both boundary layer analysis and full detailed three-dimensional numerical simulation were conducted, to investigate the effect of the net-like spacers responsible for ionic mechanical dispersion on the limiting current density. The Nernst-Planck ion transport equation for charged species was directly solved along with the continuity and Navier-Stokes equations. The net-like spacers were faithfully described in a three-dimensional geometrical space. The results obtained from both boundary layer analysis and full detailed three-dimensional numerical simulation were found in good agreement with the experimental data available in the literature.