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Effect of geometry on the effective moisture transfer diffusion coefficient
Journal of Food Engineering, 1996Abstract The effective moisture transfer diffusion coefficient ( D eff ) of ready-to-eat breakfast cereals (RTE) is determined either from an individual particle or a bulk of material in the literature. The D eff is assumed to be the same in both cases which can be dependent on the material thickness. In this study, the effect of bed depth of
M.Ahmet Tütüncü, Theodore P. Labuza
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Time-dependent neutron diffusion coefficient for the effective diffusion equation
Progress in Nuclear Energy, 2019Abstract The time-dependency of neutron diffusion coefficient as well as neutronic interfacial coefficients in nuclear reactors at short time-scale is investigated via the volume averaging method. The boundary-value problems of governing differential equation for spatial deviations around averages of local variables are developed in this work.
L. Molina-Espinosa +2 more
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The effective diffusion coefficient of degrading polymers
, 2015A porous microstructure appears in a biodegradable polymer during its biodegradation as the hydrolysis products diffuse out. The effective diffusion coefficient of a diffusing species in the polymer changes dramatically during the degradation process ...
Xiaoxiao Han
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?Uphill? hydrogen diffusion effects and hydrogen diffusion coefficients in palladium
International Journal of Hydrogen Energy, 1997Information concerning measurements of hydrogen diffusion coefficients over α- and β-phase ranges of hydrogen content in the palladium/hydrogen system is summarized. The utilization of palladium as a hydrogen purification membrane has constituted a background for observations of “uphill” hydrogen diffusion effects.
R. V. Bucur +4 more
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, 2014
The current work is concerned with obtaining a new empirical model for the time-variable effective diffusion coefficient (Deff) by extraction from plant materials.
C. Chilev, V. Koleva, E. Simeonov
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The current work is concerned with obtaining a new empirical model for the time-variable effective diffusion coefficient (Deff) by extraction from plant materials.
C. Chilev, V. Koleva, E. Simeonov
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Calculations of the effective diffusion coefficient for inhomogeneous media
Journal of Physics and Chemistry of Solids, 2002Abstract We suggest a modification of the well-known Maxwell-Garnett equation for the mobility (effective diffusion coefficient) in two-phase media (a matrix with inclusions) which permits the description of a wide range of experimental situations.
J.R. Kalnin +2 more
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Effective Diffusion Coefficient in Void Regions
Nuclear Science and Engineering, 1962The muitigroup diffusion theory for a virtually critical medium with homogeneous regions, when applied to a void region having one-dimensional cylindrical geometry, yields slightly erroneous results as a result of the fact that the theory ignores the neutron current traversing the gap.
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Effective diffusion coefficient for two-band systems
Applied Physics Letters, 2005The effective longitudinal diffusion coefficient for two-band systems is determined. Emphasis is put on the nonlinear transport regime realized at high electric fields. Particular results are obtained for bipolar transport in two-band semiconductors and vertical transport in semiconductor superlattices.
P. Kleinert, V. V. Bryksin
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Effective diffusion coefficients in solid-state sintering [PDF]
Acta Materialia, 2004 A numerical analysis of the sintering neck growth rate between rigid spherical particles of the same size is carried out. The contributions of the surface, grain-boundary and volume diffusion transport into sintering kinetics during the first and the second stages of sintering are estimated.
Eugene A. Olevsky, Andrey L. Maximenko
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The effect of duration of diffusion on Ag diffusion coefficients in YBa2Cu3O7
Journal of Quantitative Spectroscopy and Radiative Transfer, 2005Abstract The Ag diffusion in superconducting YBa 2 Cu 3 O 7 (YBaCuO) ceramic has been studied over the duration of the diffusion range 5–24 h in the temperature range 700–850 °C by the energy-dispersive X-ray fluorescence (EDXRF) technique. For the excitation of silver atoms, an annular Am-241 radioisotope source (50 mCi) emitting 59.543 keV photons
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