permeability coefficient


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Related to permeability coefficient: Permeability constant

permeability coefficient

[‚pər·mē·ə′bil·əd·ē ‚kō·i‚fish·ənt]
(fluid mechanics)
The rate of water flow in gallons per day through a cross section of 1 square foot under a unit hydraulic gradient, at the prevailing temperature or at 60°F (16°C). Also known as coefficient of permeability; hydraulic conductivity; Meinzer unit.
References in periodicals archive ?
RESULTS: The optimized values of parameters for naphthalene were a) permeability coefficient for the stratum corneum 6.8 x [10.sup.-5] cm/hr, b) permeability coefficient for the viable epidermis 3.0 x [10.sup.-3] cm/hr, c) fat:blood partition coefficient 25.6, and d) other tissue:blood partition coefficient 5.2.
The design requirements can be satisfied only when the transverse permeability coefficient of the drainage layer is larger than the transverse permeability coefficient of the extreme rainfall intensity.
Rainfall infiltration rate depends on rainfall intensity as well as the water permeability coefficient and the hydraulic gradient of topsoil.
Figure 8 shows the influence of [k.sub.h]/[k.sub.hw] on consolidation behaviour of CCSG pile composite foundation under three different patterns of horizontal permeability coefficient. It can be seen that when the horizontal permeability coefficient within soil is smaller than that within the sand-gravel shell, the consolidation rate is accelerated limited with the decrease of [k.sub.h]/[k.sub.hw].
where [lambda] = (xcos [alpha]/2) [square root of [mu]/K[H.sub.m]t,] K is the permeability coefficient (m/d), [H.sub.m] is the aquifer thickness (m), [mu] is the specific yield, t is the time of the water level decrease (d), and [h.sub.0,0] is the reservoir water level before it began to decline.
The adsorption coefficient and permeability coefficient can be used to evaluate the migration of water within the material.
where G and [lambda] are the Lame constants; [[epsilon].sub.v] is the volumetric strain; p is the pore water pressure; [x.sub.j], [u.sub.j], and [f.sub.xj] are the coordinate, displacement, and volume forces in j direction, respectively; K is the permeability coefficient; and S is the storage coefficient.
where K - f([[sigma].sub.e], P) is the empirical formula of the coupled stress and fluid flow, [[sigma].sub.e] is the effective normal stress, and K is the permeability coefficient tensor.
3, [37] which was used to calculate the permeability coefficient of the biphasic system with lamellar morphology:
Figure 22 plots the link between the permeability coefficient and the collapse and fracture pressure.
The coefficient of permeability is then determined based on Darcy's law A minimum permeability coefficient of [10.sup.-2] cm/s ([approximately equal to]100m/day) is commonly recommended for the pervious pavement structure [18,19].
Transport parameters of sennosides and sennidines in the Caco-2 assay ([p.sub.c] = permeability coefficient, % T = percent transport, Rec = recovery; data are presented as mean [+ or -] SD, n = 3) Apical to basolateral (absorptive) Compound Cone.