diffusivity

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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Wang, "Effective diffusivities and energy consumption of daylily in microwave drying," International Journal of Food Science & Technology, vol.
A huge difference between the apparent diffusivities D at 125 and 150[degrees]C is now attributed to a different meaning of the apparent diffusivity D for these two cases: a relatively low diffusivity [D.sup.0](2) at a lower T, and a much higher average diffusivity [D.sub.a] (enhanced by a contribution of fast [H.sup.0](1) species) at a higher T.
Our measurements permitted us to obtain original data on the diffusivity of the light and small-size [D.sub.2] and He penetrant molecules, and analysis of the diffusivities permitted the evaluation of the [D.sub.2] and He activation energy for diffusion which are original data here presented.
To complete the analysis and to test the reliability of this methodology, the thermal diffusivities of glycerol and two cooking oils were measured by the thermal wavelength method.
In this work, to control the filtering better and to preserve image singularities better we chose the following adaptive diffusivities,
In spite of the stronger background currents characterizing the moderate-strain case, diffusivities inferred from the dye were similar to those for the weak-straining case: namely, a diapycnal diffusivity of less than [10.sup.-5] [m.sup.2] [s.sup.-1] and a 1-5-km isopycnal diffusivity on the order of 1 [m.sup.2] [s.sup.-1] (again assuming a Fickian diffusivity and a steady-state balance between cross-streak confluence and diffusion).
Table 4 summarizes the values of diffusivities of each sample.
The design of this equipment is based on the correct estimation of diffusivities of the organic volatiles in the polymer phase, since most of the mass transfer resistance is located in the solid phase rather than in the gas phase.
(2010) revealed that moisture diffusivities increased with increasing temperature and with the application of ultrasound, while process time was reduced, which is an indication of an economy of energy, since air drying is cost intensive.
Materials with high thermal diffusivities, such as copper, require shorter duration pulses to prevent vaporization.
Kinetics and temperature dependent moisture diffusivities of pumpkin seeds during drying.
The determined cross plane thermal diffusivities exhibit significant size effect; that is, the thermal diffusivity of the 300 nm thick sputtered Ti film was 0.26 times the corresponding bulk value.