The Souders and Brown constant CSB is the C-factor [Eq. (14-77)] at the entrainment flood point. Most modern entrainment flooding correlations retain the Souders and Brown equation (14-80) as the basis, but depart from the notion that CSB is a constant. Instead, they express CSB as a weak function of several variables, which differ from one correlation to another. Depending on the correlation, CSB and uS flood are based on either the net area AN or on the bubbling area AB.

The constant CSB is roughly proportional to the tray spacing to a power of 0.5 to 0.6 (Kister, Distillation Design, McGraw-Hill, New

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