TY - JOUR

T1 - Permeation of gases in inhomogeneous polymeric membranes at unsteady state

AU - Higuchi, Akon

AU - Nakagawa, Tsutomu

PY - 1992/4

Y1 - 1992/4

N2 - Flux and concentration profiles in inhomogeneous polymeric membranes at an unsteady state were obtained by solving the continuous equation with a finite difference method:(Equation Check) where P is the permeability coefficient, S is the solubility, C is the concentration in the membrane, pm, is a hypothetical pressure in the membrane defined by C/S, x is the dimensionless space coordinate, t is the time, and L is the membrane thickness. The membranes are considered to be in a rubbery state and to have continuous, concentration-dependent, gradients of solubility and diffusivity along the flux direction (x axis), The time lag of the inhomogeneous membranes was estimated to disagree with the value calculated by L2/6D, where D is the diffusion coefficient. The flux difference due to the flow direction at the unsteady state was also investigated, and was found to be slightly higher than the flux difference in the steady state.

AB - Flux and concentration profiles in inhomogeneous polymeric membranes at an unsteady state were obtained by solving the continuous equation with a finite difference method:(Equation Check) where P is the permeability coefficient, S is the solubility, C is the concentration in the membrane, pm, is a hypothetical pressure in the membrane defined by C/S, x is the dimensionless space coordinate, t is the time, and L is the membrane thickness. The membranes are considered to be in a rubbery state and to have continuous, concentration-dependent, gradients of solubility and diffusivity along the flux direction (x axis), The time lag of the inhomogeneous membranes was estimated to disagree with the value calculated by L2/6D, where D is the diffusion coefficient. The flux difference due to the flow direction at the unsteady state was also investigated, and was found to be slightly higher than the flux difference in the steady state.

UR - http://www.scopus.com/inward/record.url?scp=85004631361&partnerID=8YFLogxK

U2 - 10.2115/fiber.48.11_619

DO - 10.2115/fiber.48.11_619

M3 - 期刊論文

AN - SCOPUS:85004631361

VL - 48

SP - 619

EP - 624

JO - Sen'i Gakkaishi

JF - Sen'i Gakkaishi

SN - 0037-9875

IS - 11

ER -