By Dibakar Bhattacharyya
Membrane concepts offer a vast technological know-how and expertise base. even though there are a number of books within the conventional membrane box, there's a nice desire for a hugely accomplished e-book. This refereed ebook covers fabrics from hugely revered researchers. This identify is very multidisciplinary in nature and may be super necessary to scientists and engineers keen on quite a few actions. scholars and school participants all over the world will locate this name to be an outstanding reference booklet. - Invited contributions from best researchers within the box. - insurance of subject is of price to scientists/engineers operating in quite a few comparable fields [separations/reactions, complicated biofunctional fabrics, contactor designs]. - goals to fill industry hole for a hugely finished ebook containing advances in either artificial and biofunctional/bimimetic membranes.
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Additional resources for New Insights into Membrane Science and Technology: Polymeric and Biofunctional Membranes
We have recently developed a new approach for describing the flux decline during membrane microfiltration that addresses many of the shortcomings in the classical fouling models and is able to explain much of the unusual flux decline phenomena reported in the literature. The following section of this Chapter describes the basic principles for this combined pore blockage - cake filtration model, including the effects of the underlying pore morphology on the flux decline. Section 3 examines the behavior of this theoretical model, using experimental data from the literature to help illustrate many of the key phenomena.
In this case, the fouling reduces the pressure drop across the lower layer of the membrane, leading to an increase m AP1 and a corresponding increase in the flux through the open pores . This increase in Jo~ partially offsets the reduction in the area of the open pores, thus reducing the extent of flux decline compared to that for the PCTE membrane alone. The solid curves m Figure 3 are model calculations developed by numerical solution of Eqs. (2) and (3). The filtrate fluxes through the open and blocked pores were given by the appropriate equations for a membrane with straight-through non-interconnected pores (Eqs.
The literature attributes the large differences in mass transfer coefficients to the above four factors. However, a rigorous analysis of the effect of each is not available, and only the first (the effect of random fiber packing) has received much attention. Rogers and Long , Wu and Chen , and Lipnizki and Field  describe similar ad hoe approaches to predicting the effect of random fiber packing. Each set of authors introduces randomness by surrounding a representative set of fibers with an annular region of varying cross-sectional area; the first two pairs of authors use Voronoi tessellation to generate polygonal regions while the last assumes concentric circular regions, see Figure 4.