diffusion in gasesorganic compoundssublimation/ Schmidt numbersdiffusion coefficientnaphthaleneairconvective heat transfersublimationgeometrical systemsAn experimental technique which is often used to study convective heat transfer by investigating analogous naphthalene sublimation situations requires a knowledge of the...
It is part of the chapter of the chapter 'Diffusion in Pure Gases' and contains data on diffusion of (1) 1,4-dioxane; (2) air Chemical substances in this chapter: Element System: - Hill Formula: - Molecular Weight: - CAS registry number(s): 132259-10-0 Substance name(s): air; ...
The mutual diffusion coefficient decreases as HFC 32 > HFC 143 a > HFC 125 > HCFC 124 > HFC 43-10 mee. The present results can also be generalized by our generalization method for the mutual diffusion coefficients of the halogenated-hydrocarbon refrigerants into air based on the principle of...
Figure 1.Composition dependence of the diffusion coefficient,D, for helium (Shelby 1996) and sodium (Frischat 1975) inxNa2O:(1−x)SiO2, and of the Haven ratio,HR, for sodium (Kellyet al. 1980) inxNa2O:(1−x)GeO2glass. 1.2Reactive Gases ...
The experimental diffusion coefficient values obtained from the novel experimental diffusion methods were in reasonable agreement with the diffusion coefficient values predicted with both the Wilke-and-Lee method and the Fuller et al. method. The experimental diffusion coefficients of n-heptane diffused ...
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 ...
The gas diffusion coefficient in soil (DP), and its dependency on soil physical characteristics, governs the diffusive transport of oxygen, greenhouse gases, fumigants, and volatile organic pollutants in agricultural, forest, and urban soils. Accurate models for predicting DP as a function of air-...
Carleman estimates for the one-dimensional heat equation with a discontinuous coefficient and applications to controllability and an inverse problem We study the observability and some of its consequences (controllability, identification of diffusion coefficients) for one-dimensional heat equations with... ...
Determination of the diffusion coefficient of vapors in gases by Stefan's method leads to results of rather low reliability. Improvement can be attained by using a recording microbalance. The determination is performed by recording the loss of weight of a small bucket containing a liquid evaporating...
Values of diffusion coefficients obtained by this method are compared with previous measurements for two of the gases, and satisfactory agreement is found. Coefficients are given for the diffusion of CO 2, NH 3, SO 2, Cl 2 and Br 2 in air at 20°C and 760 mm Hg pressure. 展开 ...