diffusivity


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Related to diffusivity: eddy diffusivity, magnetic diffusivity

diffusivity

[dif·yü′ziv·əd·ē]
(thermodynamics)
The quantity of heat passing normally through a unit area per unit time divided by the product of specific heat, density, and temperature gradient. Also known as thermal diffusivity; thermometric conductivity.
References in periodicals archive ?
As implied above, the combination of the two functions: differential water capacity, C(h), and hydraulic conductivity, K(h), to formulate the diffusivity function, D(h) [equivalent to] K(h)IC(h), is an attractive choice in a weighting function to accommodate the effects of limiting soil hydraulic properties on plant-available water as the soil dries beyond the inflection point ([h.
The following model was used to calculate the diffusivity [5]:
Data for the sorption of water and the effect of water on the solubility and diffusivity of solvents into polyethylene were measured by three different methods: pressure decay, finite inverse gas chromatography (IGC), and the static sorption method.
It also produced a 50% reduction in the diffusivity of nitrogen and increased the activation energy from 64 to 78 kJ/mol in the temperature range of 1,652-2,012F (900-1,100C).
Some of these properties will include first, second and third order transitions, coefficient of thermal expansion and contraction, modulus, energy adsorption dampening, heat capacity, thermal diffusivity, thermal conductivity, along with software and heat transfer data to model and build heat management systems.
After a month, or about 11 hours of IBMT, both increases in axon density and myelin formation were found as measured by fractional anisotropy, axial diffusivity and radial diffusivity-the important indexes for measuring the integrity of white matter fibers.
T] values very near the wall which have substantial influence on heat transfer rates at a high Prandtl numbers or at low thermal diffusivity (Thakre and Joshi, 2000; Nakaharaj et al.
Independent Materials testing laboratory, Gammadot Rheology, has refurbished its Rapra-developed Thermal Diffusivity apparatus with a view to bringing the measurement service online by the end of the month.
This was achieved by determining and comparing the drying rate, effective moisture diffusivity and activation energy values for the various blanching methods and drying temperature.
Diffusivity is a good indicator of the ability to raise the temperature and the ability to transfer heat.
In the literature regarding drying involving the moisture diffusion phenomenon, large variations in diffusivity coefficient values are observed, not only due to the product's complexity, but also due to the different prediction methods that are used, the material type, moisture content, the drying process and the methodology that is used (RESENDE et al.
By repeating DWI with the diffusion gradient applied in 6 or more different directions, the diffusion tensor, a measure that captures the combined diffusivity in the different directions, can be computed at each voxel.