Water vapor-air effective diffusivity is one of the tranport properties needed for design, modeling, and simulation of many food processes. The effective diffusivity and a tissue structure factor are defined and determined by a method based on steady state counter-current diffusion flux under zero ...
Daniel A. Vallero PhD, in Environmental Biotechnology, 2010 AERODYNAMIC AND HYDRODYNAMIC DISPERSION The process of a contaminant plume's spread into multiple directions longitudinally is known as dynamic dispersion. If in air, the spreading is known as aerodynamic dispersion, and if in water it is...
In measuring materials of high permeability, the finite rate of vapor diffusion through air in the cup may become a factor. Air-film resistance could then be a significant fraction of the sample’s resistance to vapor flow. Accurate measurement of high-permeability materials may require an account...
Water and Vapor Movement with Condensation and Evaporation in a Sandy Column The diffusion of warm, humid air into an initially cold, dry, sandy column was analysed to study the movement of water vapour and liquid water under non-is... M Sakai,N Toride,Jií imnek - 《Soil Science Society...
The water vapor feedback on ITCZ shifts is shown to be dominated by changes in the cross-equatorial asymmetry of the relative humidity of subtropical dry zones, with additional contributions by the changes in mixing ratio that occur at fixed relative humidity and by the meridional shift of the ...
Pa=naphthalene vapor pressure in air (assumed = 0) Pr =Prandtl number, seeEqn. 1(ND) Ps=naphthalene surface vapor pressure, seeEqn. 6(Torr or mmHg) R =naphthalene gas constant (0.487 mmHg m3kg−1K−1) Re =Reynolds number,(ND) ...
Certification of thermal conductivity and thermal diffusivity up to 1025 K of a glass-ceramic reference material BCR-724 D. Salmon, G. Roebben, A. Lamberty, R. Brandt Report EUR 21764 EN The mission of IRMM is to promote a common and reliable European measurement system in support of EU ...
The present work was an attempt to assess the effective moisture diffusivity, activation energy, and energy consumption of rough rice in a batch fluidized
Kinetic isotope fractionation between water vapor and liquid water or ice depends on the ratio of the diffusivities of the isotopic species in air, but there is disagreement as to the values of these ratios and limited information about their temperature dependence. We use state-of-the-art ...
The influence of air flow on effective thermal conductivity ke and water vapor diffusivity De of naturally compacted snow has been determined experimentally. The technique consists of a system involving countercurrent flow of air and heat and the measurement of steady-state temperature distribution ...