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Permeability of electrospun fiber mats under pressure driven flow
[摘要] The hydraulic permeabilities of electrospun fiber mats are found to be functions of their compressibility. Hydraulic permeabilities of electrospun mats of bis-phenol A polysulfone (PSU) comprising fibers of different mean diameters, annealed at temperatures at and above the glass transition of the polymer, were measured for feed water pressures ranging from 5 kPa to 140 kPa. The electrospun mats experience a decrease of more than 60% in permeability between 5 kPa and 140 kPa, due to the loss of porosity, attributed to flow-induced compression. This behavior is explained using a simple model based on Darcy;;s law applied to a compressible, porous medium. Happel;;s equation is used to model the permeability of the fiber mats, and Toll;;s equation is used to model their compressibility. The permeation model accurately estimates the changes in solidity, and hence the permeability of the electrospun mats, over a range of pressure differentials.
[发布日期]  [发布机构] Elsevier
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