permeability coefficient


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Related to permeability coefficient: Permeability constant

per·me·a·bil·i·ty co·ef·fi·cient

a coefficient associated with simple diffusion through a membrane that is proportional to the partition coefficient and the diffusion coefficient and inversely proportional to the membrane thickness.

per·me·a·bil·i·ty co·ef·fi·cient

(pĕr'mē-ă-bil'i-tē kō'ĕ-fi'shĕnt)
A coefficient associated with simple diffusion through a membrane that is proportional to the partition coefficient and the diffusion coefficient and inversely proportional to membrane thickness.
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References in periodicals archive ?
As such, the diffusion of naphthalene across the stratum corneum (SC) and the viable epidermis (VE) are quantified using permeability coefficients, the area of exposure, and the thickness of the membrane (McCarley and Bunge 2001; McDougal and Boeniger 2002).
The calculation results show that smooth drainage under extreme conditions can be ensured when the horizontal permeability coefficient of the drainage layer is greater than 0.28 cm/min, which is clearly less than the measured permeability coefficient of porous concrete with a pavement cross slope of 2%.
Variations in subsequent rainfall infiltration rate are often restricted by the hydraulic properties of the soil and ground conditions, and rainfall infiltration in initially unsaturated soils results in an increase in the water permeability coefficient due to an increase of water content, and it simultaneously leads to a decrease of hydraulic gradient due to a decrease of negative pore-water pressure.
Figure 9 shows the influence of [k.sub.s]/[k.sub.h] on consolidation behaviour of CCSG pile composite foundation under the change of horizontal permeability coefficient of the soil.
The permeability coefficient decreases with the increase of dry density, indicating that the connecting holes reduce with the increase of dry density (Figure 5).
If the permeability coefficient of the rock mass is still considered a fixed value during numerical simulation of fluid-solid coupling using FLAC, this finding does not accord with the engineering reality.
where [k.sub.ij] is the component of the permeability coefficient tensor; [K.sub.x], [K.sub.y], and [K.sub.z] are the coefficient tensors of the X, Y, and Z directions.
where [P.sub.r], [P.sub.r,M], [P.sub.r,L] are the experimental relative permeability coefficient of the blends and the relative permeability coefficient of the blends calculated by Eqs.
The minimum permeability coefficient depends on the target air voids (18-23%) and is 100 m/day.
Permeability in both directions was calculated by linear regression analysis of the cumulative amount transported based on the equation formulated previously (Walle et al., 1999) [P.sup.c]=dQ/dtX1/60X1/AX1/C ([P.sub.c] = permeability coefficient in cm/s, dQ/dt=rate of appearance of the drug on the receiver side in [micro]g/min, [C.sub.o] = initial drug concentration on the donor side in [micro]g/ ml, A=surface area of the monolayer).
Generally, for resins of the same chemical nature, and in aqueous products, the carbon dioxide permeability coefficient decreased with the PVC.