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Electrohydrodynamic pump and equations

  1. Feb 6, 2007 #1
    Hi all. I am reading a paper about electrohydrodynamic pump and I encounter the following equation. Can anyone explain me the physicl meaning of these two equations? I find no clue in understanding them.

    The first equation is from the manipulation of Maxwell's equation in an electroquasistatic system (BTW, what i an electroquasistatic system?)

    The author says that from the drive term on the right hand side of the first equation, it can be concluded that a requirement for the existence of free charge is the presence of a spatial gradient in conductivity or permittivity. Free charge injected into a region without such a gradient would relax in a time characterized by the charge relaxation time epsion/sigma.

    Can anyone provide me some of the background knowldege and explain me why the author says so?
     

    Attached Files:

  2. jcsd
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