Gases in large excess of air Diffusion coefficient, D12 , (cm2/s) at atmospheric pressure and given temperatures 0 °C 20 °C 100 °C 200 °C 300 °C 400 °C Name Formula 32 °F 68 °F 212 °F 392 °F 572 °F 752 °F Argon Ar 0.167 0.189 0.289 0.437 0.612 0.81 Metha...
According to the theoretical prediction of Paul, it can be concluded that the adsorbed CO2 in these glassy polymers is completely immobilized and does not participate directly in the diffusion. A computer was used in the numerical calculation to determine the true diffusion coefficient from the ...
Also, the measured diffusion coefficient at early times is greater ethan that of at late times. The measured data were used and the constants of two temperature dependent diffusion coefficient correlations for CO2-heavy oil system were modified. The ivmeasured diffusion coefficients are in the ...
Measurement of the O–O2 Diffusion Coefficient 来自 Semantic Scholar 喜欢 0 阅读量: 13 作者: RE Walker 摘要: Scitation is the online home of leading journals and conference proceedings from AIP Publishing and AIP Member Societies 关键词: Humans Severe Acute Respiratory Syndrome Patient Isolation ...
Experimental Measurements of the Diffusion Coefficient and Effective Diffusion Coefficient of CO2–Brine under Offshore CO2 Storage Conditions doi:10.1021/acs.energyfuels.3c03562In this article, the diffusion of CO2 in brine and saturated brine cores under offshore storage conditions was simulated by ...
surface CO2 concentration CA: carbonic anhydrase CAM: Crassulacean acid metabolism CCMs: CO2 concentrating mechanisms CRDS: cavity ringdown spectroscopy D a : diffusion coefficient for CO2 in the gas phase D w : diffusion coefficient for CO2 in the aqueous phase Δ: discrimination against...
The CO2-effective diffusion coefficient is a key parameter in the modelling of carbonation of cementitious materials. It is usually deduced from empirical relationships determined by tests on mixtures made with Ordinary Portland Cement (OPC). These relationships are a priori non-valid for materials ...
This work evaluates the accessibility of the thermal diffusivity a and the Fick diffusion coefficient D11 in gaseous binary mixtures of H2 and CH4 by dynamic light scattering (DLS). The investigations are performed at temperatures T and pressures p of (293, 333, 363, and 393) K and (5, ...
Various models have been developed for the mathematical description and modelling of diffusion. An overview is given e.g. by [54]. Generally, the water vapor diffusion coefficient depends on the actual concrete mix composition, microstructure and boundary conditions (mainly humidity and temperature)....
Rates of diffusion in gases increase with the temperature (T) approximately asT3/2and are inversely proportional to the pressure. The interdiffusion coefficients of gas mixtures are almost independent of the composition. Kinetic theory shows that the self-diffusion coefficient of a pure gas is invers...