Souders-Brown Equation

Written by Jerry Ratzlaff on 12 April 2020. Posted in Fluid Dynamics

souders brown equation 1 Souders-Brown equation is used to find the maximum allowable vapor velocity in vapor-liquid seperation vessels.

Souders-Brown Equation formula

\(\large{ v = K \; \sqrt{ \frac{\rho_l \;-\; \rho_v}{\rho_v} } }\)

Units	English	Metric
\(\large{ v }\) = maximum allowable vapor velocity	\(\large{\frac{ft}{sec}}\)	\(\large{\frac{m}{s}}\)
\(\large{ \rho_l }\) (Greek symbol rho) = density of liquid	\(\large{\frac{lbm}{ft^3}}\)	\(\large{\frac{kg}{m^3}}\)
\(\large{ \rho_v }\) (Greek symbol rho) = density of vapor	\(\large{\frac{lbm}{ft^3}}\)	\(\large{\frac{kg}{m^3}}\)
\(\large{ K }\) = vapor velocity factor	\(\large{dimensionless}\)	\(\large{dimensionless}\)
K Factors for maximum allowable superficial velocity (API Spec 12J) Vertical separator - 5 ft. high - K = 0.12 to 0.24 Vertical separator - 10 ft. high - K = 0.18 to 0.35 Horizontal separator - 10 ft. long - K = 0.40 to 0.50 Horizontal separator - Other lengths L ft. long - K = 0.40 to 0.50 \(\left( \frac{L}{10}\right)^{0.56} \) Spherical separator - All - K = 0.2 to 0.35	\(\large{dimensionless}\)	\(\large{dimensionless}\)

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