Sherwood-Lobo flooding correlation

Packed towers should operate near 70% of the flooding rate given by the correlation of Sherwood, Lobo, et al. 

Figure 13.39. The Sherwood-Lobo correlation of flooding limit in random packed beds, is the superficial linear velocity of the gas, is the ratio of viscosities of the liquid and...

Figure 13J9. The Sherwood-Lobo correlation of flooding limit in random packed beds. is the superficial linear velocity of the gas, njji is the ratio of viscosities of the liquid and water, Sg is the specific surface of the packing (sqft/cuft), pg and p, are densities of gas and liquid, and e is the fraction voids the ratio Sg/e is the factor F oT the table with Figure 13.37 [Sherwood, Shipley and Holloway, Ind. Eng. Chem. 30, 765 (1938) Lobo, Friend, and Hashmall, Trans. AIChE 41, 693 (1945)].

A useful graphical correlation for flooding rates was first presented by Sherwood et a/.(60) and later developed by Lobo el al.(6l> for random-dumped packings, as shown in Figure 4.17 in which ... 

The flood velocity is defined as that vapor velocity above which liquid accumulates uncontrollably in the packed bed and continued operation becomes impossible. The variables which determine the flood velocity are the packing geometry, system properties, and liquid viscosity. The first published model was that of Walker et al.35 in 1937. In 1938, Sherwood et al.30 made a minor adjustment to the correlations. Lobo et al.27 made a further improvement in 1945. Further modification to the correlation was made by Eckert in 196310 and in 1970.11 The final Eckert correlation for flood velocity... 

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