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    The onset of electrohydrodynamic instability in isoelectric focusing

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    Author
    Baldessari, Fabio, 1979-
    Issue Date
    1993
    Keywords
    Engineering, Chemical.
    Advisor
    Baygents, James C.
    
    Metadata
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    The onset of electrohydrodynamic motion in a thin layer of liquid has been investigated for the case in which the electrical conductivity varies linearly across the liquid layer. It is shown that a finite conductivity gradient can be quiescently sustained, provided certain requirements are satisfied. Dimensional analysis shows, and numerical computations confirm, that the conditions for the onset of motion in the layer can be characterized by two dimensionless parameters: the electrical Rayleigh number, and the dimensionless conductivity gradient. Interest in the problem stems from experiments on isoelectric focusing (IEF), an electrically-driven separation process used to purify peptide and protein mixtures. Previous experiments had led to the postulate that, as conductivity gradients developed during IEF, electrohydrodynamic convection would arise to disrupt the separation process. The theory developed here supports such a postulate.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Chemical Engineering
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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