Geankoplis

More recently, the Wakao-Smith type of model has been generalized by Cunningham and Geankoplis [50] to admit two different sizes of macropore. 

Geankoplis [54] fabricated a porous medium for which the values of K, and are known a priori. This was accomplished by sealing a bundle of identical parallel cylindrical capillary tubes between the two chambers of a Wlcke-Kallenbach apparatus. Then the relevant flux relations are those which apply to a single cylindrical capillary, rather than a porous medium, and these are obtained by setting... 

Remick and Geankoplis made flux measurements for both species in the isobaric diffusion of nitrogen and helium through their tube bundle. Pressures spanned the interval from 0.444 nim, Hg to 300,2 ram Hg, which should cover the whole range between the limits of Knudsen streaming and bulk diffusion control. Then, since K and K, are known in this case, the form of the proposed flux relations could be tested immediately by plotting the left hand side of equation (10.15) against... 

Reprinted with permission from Remlck and Geankoplis, Ind. Eng. Chem. (Fund.) 12 (1973) 214. Copyright by the American Chemical Society. 

All the experimental teats described so far have been confined to binary mixtures, but of course it is also desirable to know whether flux relations adequate in binary mixtures are still successful in mixtures with more than two components. Even in the case of ternary mixtures the form of explicit flux relations is very complex, and a complete investigation of the various matrix elements, in their dependence on both pressure and composition, would be a forbidding undertaking. Nevertheless some progress in this direction has beet made by Hesse and Koder [55] and by Remick and Geankoplis [56]. 

Remick and Geankoplis also used their data to check the generalized Graham relation (6.2) and found experimental values for N wh ich... 

Geankoplis, Transpoii Processes and Unit Operations.. 3d ed., Prentice Hall, 1993. 

Correlations for estimating overall mass-transfer coefficients can be found in McCabe et al. (1993), Perry and Green (1984), Geankoplis (1983), Henley and Seader (1981), King (1980) and Treybal (1980). 

Geankoplis, C. J. (1983). "Transport Processes and Unit Operations, 2nd ed. Allyn and Bacon, Boston. 

Geankoplis, C.J., Transport Processes and Separation Process Principles , 4th edn. Prentice Hall, New Jersey, 2003, p. 988. 

An agitated batch tank, is used to dissolve a solid component from a solid matrix into a liquid solvent medium, as in Fig. 1.18, Geankoplis (1983). 

The functional dependence of jD on Reynolds number has been the subject of study by many investigators [e.g., Thodos and his co-workers (77, 78), and Wilson and Geankoplis (79)]. A variety of equations have been proposed as convenient representations of the experimental data. Many of these correlations also employ the bed porosity (eB) as an additional correlating parameter. This porosity is the ratio of the void volume between pellets to the total bed volume. 

Figure 4.8. Longitudinal dispersion in liquids in packed beds. CP—Cairns and Prausnitz(37), CB — Carberry and Bretton(32) EW—Ebach and White(38) H — Hiby(39) LG—Liles and Geankoplis(40)...

For 0.0015 < Re < 55, the Wilson-Geankoplis correlation has been used in adsorption from liquid phase (Perry and Green, 1999 Xiu and Li, 2000 Chen and Wang, 2004). 

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