The accuracy of the stagnant film equation in the study of electrophoretic migration of solutes near an ultrafiltration membrane-a numerical study

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

S.I.S. Pinto (Autor) FEUP; J.M. Miranda (Autor) FEUP; J.B.L.M. Campos (Autor) FEUP

Revista

Título: Desalination and Water Treatment

Vol. 51

Páginas: 7509-7522

ISSN: 1944-3994

Editora: Desalination Publications

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas > Engenharia

Outras Informações

ID Authenticus: P-006-JAD

DOI: 10.1080/19443994.2013.778796

Abstract (EN): In membrane separation processes, the film equation is frequently used since it is a fast and easy way to predict the permeate velocity. In this work, the applicability of the film equation, based on a convective-diffusive-electrophoretic migration model (CDE), is evaluated using an in-house code. CDE model accounts for the transport of charged solutes in the boundary layer over a charged membrane. Two versions of the film equation were developed: CDE I--non-linear electric potential and total rejection of components; CDE IIuniform electric field and transmission of components through the membrane. The Sherwood number profiles, along the membrane length, for bovine serum albumin and lysozyme were determined by film equations. The permeate velocities, concentrations and rejection coefficients, obtained by solving numerically the conservative equations, were used as input to film equations. The Sherwood number profiles, determined by CDE I, are independent of the electric potential at the membrane surface, for low values of electric potential. The Sherwood number profiles, determined by CDE II, are independent of the electric field, for low values of electric field. In these ranges, Sherwood number profiles are identical to those in an impermeable cell and the film equation can be used to make accurate predictions.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14