The transverse water vapor diffusivity in samples of spruce bark, pine bark, inner birch bark, and outer birch bark were determined to be 1.1–1.7·106, 2.2–9.2·107, 1.5–2.6·106, and 4.3–13·108m2/s, respectively. The in-plane diffusivity was of the same magnitude as the transverse...
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Effective diffusivity was found to be 0.104x10 -4 m 2 /s and the overall mass transfer coefficient was found to be 0.019 m/s at a temperature of 40°C. 展开 关键词: Water vapor Proton exchange membrane fuel cells Gas diffusion layers ...
but rather it is a tracer diffusivity. In Fig.1a, the mass flux arises from molecular diffusion of dilute water vapour in air, where the air is essentially stationary. We discuss later whether this simple Fick’s law
The initiator provides the water vapor that creates the supersaturation, while the moderator provides the time for particle growth. The combined length of the initiator and moderator sections is the same as that of the original, warm-walled growth section. Model results show that this new approach...
The pore size distribution of the samples was in the range where normal gaseous diffusion was expected. Thus, the apparent diffusivity of water vapor through the HDPE samples was controlled exclusively by sample porosity and was independent of pore size....
UNSTEADY-STATE WATER-VAPOR ADSORPTION IN WOOD - AN EXPERIMENTAL-STUDY WADS(O) L. Unsteady-state water vapor adsorption in wood:An experimental study[J].{H}Wood and Fiber Science,1994,(1):36-50... WADSO - 《Wood & Fiber Science Journal of the Society of Wood Science & Technology》 被...
The mass of atmospheric water vapor, although small in relation to the amount of total global water, is stored as vapor for the least amount of time (average renewal time of 8.9 days) before returning to the earth as rain, snow, sleet, hail, or condensates (dew and frost), either on ...
Water vapor distributions from the mouth to the first four generations of the tracheobronchial tree are given in terms of relative humidity or mass fraction. The mass transfer coefficients of water vapor are correlated as a function of local flow rate and temperature-dependent diffusivity, which ...
The diffusivity in the radial direction was always larger than that in the axial direction despite the variation of the relative humidity differential. This fact implied the anisotropic distributions of air voids and aggregates in the asphalt mixture specimens, which assisted water vapor in diffusing ...