Multifilm techniques have been used to measure the diffusion coefficient of water vapor in cellophane, and the data have been compared with the integral diffusion coefficient obtained in previous work with single films. The multifilm techniques lead to a much sharper resolution of the effect of ...
water vapor diffusion in polymersdiffusion coefficientwater vapor gravimetric sorptionpolyimidesDiffusion coefficients of water vapor in a polyimide homopolymer and poly(imide-siloxane) multi-block copolymers of different siloxane concentration were determined from gravimetric sorption experiments. Diffusion ...
Re: Diffusion Coefficient of water vapor in a gas mixture « Reply #1 on: July 01, 2019, 10:20:16 AM » Your gas mixture is basically air, and you can find experimental diffusion constants for water vapor in air at different temperatures: e.g., https://www.engineeringtoolbox.com...
Small variations in temperature of the evaporating liquid have a very strong influence, especially at higher evaporation rates. The diffusion coefficient of water vapor in air is determined at 323, 333, and 343 K.doi:10.1007/978-1-4757-0725-0_8K. M. Dijkema...
aThe hygrothermal properties of the relevant building materials: 相关的建筑材料的hygrothermal物产:[translate] aare moisture and temperature dependent. However, for 是湿气和温度受抚养者。 然而,为[translate] awater vapor diffusion coefficient, temperature 水蒸气扩散率,温度[translate]...
The experimental measurement of the moisture diffusion coefficient by the steady-state method makes use of a diffusion cup. Water or a saturated salt solution is placed inside the cup to maintain the desired water vapor pressure on one side of the wood specimen that is used to cover themouthof...
(2).∂C1(r,t)∂t=1r∂∂rrD1∂C1(r,t)∂rwhere: C1(r,t) = concentration of water molecules, g/mm3; t = diffusion time, s; D1 = diffusivity (diffusion coefficient) in the radial Development of 2-D water vapor diffusion model The 2-D model took into consideration ...
Application of a n-phase model to the diffusion coefficient of chloride in mortar3 In this paper, we propose first a critical review of models for chloride diffusion coefficients already used in literature at different scales and then we... S Caré,E Hervé - 《Transport in Porous Media》 ...
RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook Vapor diffusion Movement of water vapor through a material; water vapor can diffuse through even a solid material if the material’s permeability is high enough. ...
1993].SF6isanidealtracerowingtoitslackofchemical and biologicalreactivity,lownaturallevels,andlowdetectionlimit usinggaschromatography withelectroncapturedetection.The resultsofSF6studies havebeenusedasthebasisforderiving andtestingageneralrelationship betweenwindspeedandthe gasexchangecoefficientk,where Flux=k(C-C...