Vapor Mass Velocity of Tray Type Tower

 

Vapor Mass Velocity of Tray Type Tower Formula
\( w  \;=\;  3600 \; k_g \;  [\; ( \rho_l - \rho_g) \; \rho_g \;] ^{0.5}   \)
Symbol	English	Metric
\( w \) = Vapor Mass Velocity of Tray Type Tower	\(lbm\;/\;ft^2-h\)	-
\( k_g \) = Sizing Constant	\(ft\;/\;sec\)	-
\( \rho_l \) = Liquid Density	\(lbm\;/\;ft^3\)	-
\( \rho_g \) = Gas Density	\(lbm\;/\;ft^3\)	-

Vapor mass velocity in a tray-type tower is the mass of vapor that flows through a specific area cross-section of the tower per unit of time.

Key Points about Tray Towers

• Vapor mass velocity is needed in determining the capacity and efficiency of the tray column.
• It affects the tray efficiency, flooding point, and pressure drop.
• Higher vapor mass velocities may lead to entrainment and flooding, while lower velocities may result in weeping or poor mass transfer.