Tortuous pore, liquid membrane

Separation takes place in microfiltration primarily between solids and liquids, and many established applications are simply extensions of conventional filtration into a lower particle size range. (See Section I.A.) A homogeneous porous membrane used as a conventional depth filter traps particles on its surface and inside the tortuous pores. The membrane can become clogged... 

In inertial capture, relatively large particles in the flowing liquid cannot follow the fluid flow lines through the membrane s tortuous pores. As a result, such particles are captured as they impact the pore wall. This capture mechanism is... 

Figure 3 is a schematic representation of a tortuous pore in a liquid membrane support. Lee et al. (33) define the tortuosity, T, as the following ... 

The filtration of particles in a gas stream can be quite different from the filtration of the same particles in a liquid stream. The three mechanisms of aerosol particle retention may be illustrated from the data of Spurny et al20 in Figures 2.22 and 2.23. The U-shaped curves are characteristic of the efficiency of aerosol particle collection as a function of particle size. However, "capillary-pore" membranes have a deeper minimum in the curves than do "tortuous-pore membranes."... 

In this study, experiments on the simultaneous permeation of CO2 and CH4 through aqueous MEA, DEA and ethylenediamine hydrochloride (EDAHCl) membranes are performed and the permeation rates of CO2 are quantitatively discussed on the basis of the approximate solution of facilitated transport (77). A method is also proposed for applying the facilitated transport theory developed for a liquid membrane consisting of a liquid membrane phase alone to the analysis of facilitated transport through a supported liquid membrane prepared by impregnating a microporous polymer support having tortuous pore structure with a carrier solution. 

When the denuder active surface is an inert porous membrane such that the analyte molecule must diffuse across the pores to be trapped by an absorber liquid, only a fraction of the membrane surface is porous, and the pores may also be tortuous. Consequently, collision at the membrane surface is not synonymous with uptake. Corsi et al. (45) developed a numerical solution for the collection efficiency observed for such a membrane-based diffusion denuder, hereinafter referred to as a diffusion scrubber (DS). Both groups of researchers dealing with the issue of less than unity uptake probability reached the conclusion that this value must be very much less than... 

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