Particle Collection from Aqueous Suspensions by Permeable Hollow Fibers
Permeable hollow fibers can be utilized as a filter medium to increase the collection efficiency of conventional depth filters. The permeability of the wall permits modification of the chemistry and hydrodynamics of the fiber-suspension interface, thereby increasing the transport and attachment of particles to the filter. Modification of the interface is accomplished by induction of a minute flow of liquid into the fiber interior and/or by the diffusion of a destabilizing chemical from the fiber interior. The flow of liquid into the fiber surface reduces the viscous drag on the particle as it nears the surface of the filter thereby increasing the rate of transport. The destabilizing chemical reduces repulsion (electric double layer) between particle and fiber surfaces, increasing the fraction of particle-fiber contacts resulting in attachment.
KeywordsFiber Surface Hollow Fiber Viscous Drag Fiber Wall Concentration Boundary Layer
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