Jet Mixer Design Method

The mixing rate can be estimated using the Corrsin (1964) time scale (see Chapter 2), where the turbulent energy dissipation rate is calculated at the end of the jet path and the appropriate length scale is the jet s free path, Z  

The tmbulent kinetic energy dissipation rate at the end of the jet is estimated from the jet s centerline velocity and diameter at the end of its free path  

The velocity on the centerline of a turbulent jet can be estimated from Rajarat-nam (1986)  

As the jet moves away from the nozzle it expands and slows down as it entrains the surrounding fluid. Its momentum is conserved. The relationship between the jet velocity at the nozzle, the nozzle diameter, and the jet s velocity and diameter at any distance along its path will be 

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