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3.3.4 Coupling With Fluid Dynamics

To couple population balance modeling of the secondary phase(s) with the overall problem fluid dynamics, a Sauter mean diameter ( $d_{32}$ in Equation  2.3-30) may be used to represent the particle diameter of the secondary phase. The Sauter mean diameter is defined as the ratio of the third moment to the second moment for the SMM and QMOM. For the discrete method, it is defined as


d_{32} = \frac{\sum N_i L_i^3}{\sum N_i L_i^2} (3.3-1)

To specify the Sauter mean diameter as the secondary phase particle diameter, open the Secondary Phase dialog box.

figure Phases figure figure Secondary Phase figure Edit...

In the Secondary Phase dialog box (e.g., Figure  3.3.10), select sauter-mean from the Diameter drop-down list under Properties. Note that a constant diameter or user-defined function may also be used.

Figure 3.3.10: The Secondary Phase Dialog box for Hydrodynamic Coupling
figure

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