effective permeability

effective permeability

[ə¦fek·tiv pər·mē·ə′bil·əd·ē]
(physical chemistry)
The observed permeability exhibited by a porous medium to one fluid phase when there is physical interaction between this phase and other fluid phases present.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Assuming that the dielectric spheres are located in the host medium randomly and homogeneously, in the quasistatic limit, we can derive the relative effective permittivity [[epsilon].sub.eff]([omega]) and the relative effective permeability [[mu].sub.eff] ([omega]) from the extended Maxwell-Garnett theory (EMG), as shown in [14]
The effective permeability coefficient, like the suction powered function, could be presented as the following:
Common metal has effective permeability below 1, such as 0.5, at the MHz level, and resistance becomes low due to the generated [E.sub.B].
For Knudsen numbers greater than 0.01, an effective permeability must be computed to compensate for the Knudsen diffusion and/or the slippage flow.
under this assumption, the effective permeability is an average value over the subdomains that reflects the comprehensive effects of cracks and matrix [12,13].
The ratio of output signal y(t) to input signal x(t) varies directly to wavelength A while its constant of proportionality K defines the links parameters (electrical properties of the channel) such as effective permeability [[mu].sub.e], and it is the effective dielectric constant, effective permittivity [[epsilon].sub.e] which implies the dielectric constant of a homogeneous medium that replaces air, depending on the nature of the material, signal source core/chip gain [G.sub.t], and receiving core/chip gain [G.sub.m].
In Figures 2 and 3, effective permeability and permittivity tensors perpendicular components [[epsilon].sub.eff] = [[epsilon].sub.xx] = [[epsilon].sub.yy] and [[mu].sub.eff] = [[mu].sub.xx] = [[mu].sub.yy] behavior is showed versus magnetic inclusion filling fraction (f = [d.sub.a]/a, where [d.sub.a] is the magnetic layer thickness).
At this frequency, the effective permittivity is [epsilon] = -9111.7 - i5655.8, and the effective permeability is [mu] = -4.7 + i6.7.
(2011) find that the maximum value of effective permeability enhancement is 5 x 10-16 [m.sup.2] and the maximum enhanced permeability is 1.5 x [10.sup.-15] [m.sup.2].
where [K.sub.p] is effective permeability, [K.sub.p] = K/[R.sub.k] [R.sub.k] being permeability reduction coefficient; [[phi].sub.p] is effective porosity, [[phi].sub.p = [phi](1 - IPV).
MTM sample consisting of hexaferrite slab and metallic array of parallel wires ensures the corresponding negative values for the effective permeability in a frequency domain which overlaps the domain with negative permittivity [3] as in Figure 2(c).

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