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FIG. 14-35 Discharge coefficients for gas flow, sieve trays. [Liebson, Kelley, and Bullington, Pet. Refiner, 36(3), 288 (1957).]

but can also be calculated from Bolles' [Chem. Eng. Prog. 72(9), 43 (1976)], Lockett's (Distillation Tray Fundamentals, Cambridge University Press, Cambridge, England, 1986), and Klein's (Chem. Eng., May 3, 1982, p. 81) methods.

For valve trays, Klein gives the following values for K (in s2-mm/m2) in Eq. (14-101), when based on the total hole area (not slot area):

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