Water transport through the gas diffusion layer (GDL) of a proton exchange membrane (PEM) fuel cell is of critical importance in the operation of the fuel cell. In this study, the transport of water vapor through the GDL is investigated. A one-dimensional, single-phase heat and mass ...
For the solubility and diffusivity of water vapor in membranes 4.23-7.74 cm3/(cm 3 cmHg) and 2.0-3.5 × 10-13 mZ/s values have been determined respectively. The measured permeability of water vapor through membranes 1.6-7.3 × 10 -6 ((cm2/s)/(cm z cmHg))cm, were much higher than ...
Movement of water in relatively dry soils is due in part to vapor diffusion and adsorption. The significance of this vapor transport process to solution movement depends on the relative magnitudes of the liquid and vapor diffusivities. Dependence of the vapor diffusivity on vapor adsorption results ...
DB Greenberg,RS Cresap,TA Malone - 《Water Resources Research》 被引量: 16发表: 1968年 Intrinsic Permeability of Hydrological Porous Mediums: Variation With Temperature Jooss M., Reinhard H.W., "Permeability and diffusivity of concrete as function of temperature", Cement and Concrete Research, vo...
where p is the dry pressure in hPa, e the partial pressure of water vapor in hPa, and T the temperature in K. The term in brackets is usually termed the refractivity N. In the lower atmosphere, up to ∼20 km altitude, fluctuations in atmospheric density, temperature and humidity determi...
Contaminant Diffusion, Solubility, and Material Property Differences between HDPE and PEX Potable Water Pipes The objectives of this work were to identify differences between the composition, bulk properties, contaminant diffusivity and solubility for new high-dens... AJ Whelton,AM Dietrich,DL Gallagher...
For instance, no more than 6.15 g of NaCl (salt) can dissolve in one liter of water [43]. This sounds like a quite discouraging fact of the potential application of diffusiophoresis at first glance. However, this seemingly upper bound problem has been overcome with the fast advancement of ...
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 ...
The chapter deals with bulk movement, under isothermal conditions, of the liquid phase in response to mechanical driving forces. However, the transport of water in the gas phase by vapor diffusion will be included in the measured hydraulic conductivity and diffusivity, especially at low water ...
Numerical analysis of moisture vapor diffusion in asphalt mixtures using digital images 2010, Materials and Structures/Materiaux et Constructions Experimental measurement and numerical simulation of water vapor diffusion through asphalt pavement materials 2010, Journal of Materials in Civil Engineering Mathematica...