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23.11.2 Including Cavitation Effects

For mixture model calculations, it is possible to include the effects of cavitation, using FLUENT's cavitation model described in Section  23.7.4. To enable the cavitation model, turn on the Cavitation option in the Mass tab of the Phase Interaction panel.

Figure 23.11.5: The Phase Interaction Panel for Mass Transfer with Cavitation Enabled

When you are using FLUENT's cavitation model, you will specify three parameters to be used in the calculation of mass transfer due to cavitation. Under Cavitation Parameters in the Phase Interaction panel, set the Vaporization Pressure ( $p_{\rm sat}$ in Equation  23.7-15), the Surface Tension Coefficient , and the Non-Condensable Gas Mass Fraction . The default value of $p_{\rm sat}$ is 2540 Pa, the vaporization pressure for water at ambient temperature. Note that $p_{\rm sat}$ and the surface tension are properties of the liquid, depending mainly on temperature. Non-Condensable Gas Mass Fraction is the mass fraction of dissolved gases, which depends on the purity of the liquid.

When multiple species are included in one or more secondary phases, or the heat transfer due to phase change needs to be taken into account, the mass transfer mechanism must be defined before turning on the Cavitation option. This is defined in the same way as described Section  23.9.7. It may be noted, however, that for cavitation problems, at least two mass transfer mechanisms are defined:

In the Phase Interaction panel (Figure  23.11.6), you should choose the constant-rate option in the Mechanism drop-down list and leave the value as 0 for both mass transfer mechanisms before turning on the Cavitation option.

Figure 23.11.6: The Phase Interaction Panel for Mass Transfer with Cavitation Disabled

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