Fuller-Schettler-Giddings equation

The ail viscosity can be found in Table 1.2, Appendix I, where we find that the viscosity at 644 K is about 3.1 X 10 5 kg/m s. The Fuller—Schettler—Giddings equation is proposed for the determination of the diffusion coefficient of nonpolar gases in binary mixtures at... 

Binary Mixtures—Low Pressure—Nonpolar Components Many evaluations of correlations are available [Elliott and Watts, Can. J Chem., 50,31 (1972) Lugg, And. Chem., 40,1072 (1968) Marrero and Mason, AlChE J., 19, 498 (1973)]. The differences in accuracy of the correlations are minor, and thus the major concern is ease of calculation. The Fuller-Schettler-Giddings equation is usually the simplest correlation to use and is recommended by Poling et al. 

Dg values can be estimated with the aid of the Fuller-Schettler-Giddings equation [36] or by some other calculation method (see, for example, [37]). 

B - 2Dg, (calc) is calculated using Fuller-Schettler-Giddings equation. 

The molecular diffusion coefficient, D i, can be calculated fi om the binary diffusion coefficients (Dy) obtained from the Fuller-Schettler-Giddings equation [20] for gas-phase systems. The individual diffusion coefficients, Dmi, can be estimated from the binary diffusion coefficients using Wilke s approximation [20]. For the Knudsen diffusion... 

The diffusion coefficients in gas and liquid phases play an important role in the correlation equations, because the film thickness, film coefficient, and diffusion coefficient are related to each other. Gas-phase diffusion coefficients can be estimated using the Fuller-Schettler-Giddings equation [9] and the Wilke approximation [9] (Appendix 4). Liquid-phase diffusion coefficients are more difficult to estimate. A frequently used correlation equation for the liquid-phase diffusion coefficient is the Wilke-Chang equation [4,9], which is reliable for poorly soluble gases, in clean liquids and liquid mixtures (Appendix 6). There are also several other methods presented in the literature. The estimation methods are discussed in detail in the book The Properties of Gases and Liquids [9]. 

Fuller-Schettler-Giddings The parameters and constants for this correlation were determined by regression analysis of 340 experimental diffusion coefficient values of 153 binary systems. Values of X Vj used in this equation are in Table 5-16. 

Fuller-Kinyon pump, 11 378 Fuller-Schettler-Giddings diffusivity equation, 15 674 Fuller s earth, 6 666, 686... 

In these equations Ca is the concentration of component A, Dab is the diffusivity of A in B, and x is the mole fraction. The second term in (16-2) accounts for transport by bulk flow, and the first for the diffusive transport which is superimposed on the bulk flow. Diffusivity is a physical property of the component pair A and B. Values for a number of gases in binary mixtures with air at 25°C and 1 atm (101.3 kPa) pressure can be found in many handbooks. Diffusivi-ties for other gas or liquid mixtures are scarcer and often have to be determined experimentally, as will be illustrated in Example 16.1. In the absence of experimental data, binary diffusivities can be calculated in gases at low pressures by the empirical equation of Fuller, Schettler, and Giddings. ... 

A number of empirical correlations for gaseous diffusion coefficients at low pressures based approximately on the ideal gas form have been pn rosed. According to Reid et al. ° the equation of Fuller, Schettler, and Giddings appears to be the best, generally predicting diffusivities of nonpolar gases within 10%, although the temperature dependence may be underestimated. 

Fuller, Schettler, and Giddings developed a successful equation in which atomic and structural volume increments and other parameters were obtained by a least-squares fit to over 340 measurements. In the Fuller et al. (FSG) method, which provides the best practical combination of simplicity and accuracy,... 

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