N1 fata Pe

Pg e where:

4XEoc\1/2

"j

and Pe is the Peclet number, defined as Pe = Z2/DEij. Here Zl is the length of liquid travel, or the distance between the two weirs and tl is the liquid residence time. The effective diffusivity is given by:

where DE is in square feet per second, uG is superficial gas velocity, expressed as cubic feet per second divided by the active bubbling area in square feet. As the Peclet number becomes large, this model predicts efficiency enhancement much large than unity. In large diameter columns (large Zl) the Peclet number can tend to take a large value which would suggest significant efficiency enhancements. But it should be remembered that the above model considers only the longitudinal mixing process. In large diameter columns, the liquid flow structure can be much more complicated as documented by Solari and Bell (1986). Hence, predicted values of EMV/EOG greater than 1.2 by the longitudinal mixing model should be viewed with caution, as they may not be realized in the field.

Effect of Entrainment on Murphree Tray Efficiency

The effect of entrainment on the Murphree tray efficiency is estimated from:

"Em

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