unit 5 Convective Mass Transfer Correlations

Which dimensionless group is used to correlate mass transfer data in turbulent flow?

• Peclet Number
• Lewis Number
• Nusselt Number
• Prandtl Number

The Sherwood number is defined as the ratio of which two quantities in mass transfer correlations for flow over a sphere?

• Mass transfer rate and fluid velocity
• Mass transfer rate and concentration gradient
• Mass transfer rate and pressure gradient
• Fluid velocity and concentration gradient

Which correlation is used for predicting mass transfer coefficient in packed beds for low Reynolds number flows?

• Chilton-Colburn analogy
• Ergun equation
• Sherwood correlation for flow over a flat plate
• Stanton-Scatchard correlation

What is the mass transfer coefficient in terms of Sherwood number and characteristic length for flow over a flat plate?

• Sh = 0.664(Re^0.5)(Sc^0.33)
• Sh = 0.023(Re^0.8)(Sc^0.33)
• Sh = 2 + 0.6(Re^0.5)(Sc^0.33)
• Sh = 1.43(Re^0.5)(Sc^0.33)

The Reynolds number is defined as the ratio of which two quantities in mass transfer correlations for flow in a circular tube?

• Inertial forces and viscous forces
• Inertial forces and gravitational forces
• Gravitational forces and viscous forces
• Inertial forces and pressure forces