In view of inaccuracy, limitations and computation complexity of the present empirical formulas in computing diffusion coefficient of binary gas in normal atmosphere, this letter proposes a new formula for computing diffusion coefficient.中国科学通报:英文版陈昭宜刘蕊梅...
The Darcy permeability is similar to the diffusion coefficient, which represents the viscous resistance of a solid material to fluid flow under a pressure gradient, and is related to the microstructure of the solid skeleton and the viscosity of the fluid. ...
Gas in water Diffusion coefficient, D, (×10-5cm2/s ) at atmospheric pressure and given temperatures 10 °C 15 °C 20 °C 25 °C 30 °C 35 °C Name Formula 50 °F 59 °F 68 °F 77 °F 86 °F 95 °F Acetylene C2H2 1.43 1.59 1.78 1.99 2.23 Ammonia NH3 1.30 1.50 ...
The asymptote of the curve intersects the time axis at a point whose position serves to determine the diffusion coefficient, by applying an equation derived from the formula given by Carslaw and Jaeger. The coefficients thus determined for the three rare gases in runs at temperatures between ...
Considering the above factors, the effective diffusion coefficient of gas molecules in a coal seam can be defined as: (28)Dfe=Dfθeτ Where, Dfe is the effective Fick diffusion coefficient of the gas, m/s; θe is the effective surface porosity; τ is the tortuosity factor, introduced to...
Research on molecular diffusion coefficient of gas oil system under high temperature and high pressure 热度: 相关推荐 a r X i v : c h a o - d y n / 9 7 1 1 0 2 2 v 1 2 7 N o v 1 9 9 7 Computingthediffusioncoefficientforintermittentmaps: Resummationofstabilityorderedcyc...
People's Republic of China Yinping Zhang Department of Building Science, Tsinghua University, Beijing, People's Republic of China ABSTRACT The initial mobile formaldehyde concentration, Cm,0; the partition coefficient, K; and the diffusion coefficient, D, of a dry building material are key parameter...
Graham's law defines the rate of diffusion of the gas. The rate of diffusion of a gas is inversely proportional to the square root of the mass of the gas. The expression of the law is: r∝1M Here: r is the rate of diffusion of the gas. ...
whereJis the rate of mass transport in kg/m2/s,Dis thediffusion coefficientin m2/s, dc/dxis theconcentration gradientin kg/m4andxis the distance in m. This is, of course, a simplification, since gases such as CO2penetrating into concrete interact with some of thehydration products, causing...
during a certain time interval (t) in a medium whose coefficient of diffusion (D) is known,Dbeing equal to one-half the average of the square of thedisplacementin thex-direction. This formula for probability “density” allowsPto be plotted againstx. The graph is the familiarbell-shaped ...