在混合模型计算中定义第二相的步骤如下：
1． Select the phase (e.g., phase-2) in the Phase list.
2． Click Set..., and the Secondary Phase panel (Figure 20.6.6) will open.
Figure 20.6.6: The Secondary Phase Panel for the Mixture Model
3． In the Secondary Phase panel, enter a Name for the phase.
4． Specify which material the phase contains by choosing the appropriate material in the
Phase Material drop-down list. 5． Define the material properties for the Phase Material, following the same procedure you
used toset the material properties for the primary phase(see Section 20.6.8). For a particulate phase (which must be placed in the fluid materials category, as mentioned in Section 20.6.1), you need to specify only the density; you can ignore the values for the other properties, since they will not be used.
6． In the Secondary Phase panel, specify the Diameter of the bubbles, droplets, or particles
of this phase ( d p in Equation 20.3-12). You can specify a constant value, or use a user-defined function. See the separate UDF Manual for details about user-defined functions. 7． Click OK in the Secondary Phase panel.
Defining the Slip Velocity
如果你在混合计算中要求解滑流速度，你想指定滑流速度的定义，click Interaction... to
open the Phase Interaction panel (Figure 20.6.7).
Figure 20.6.7: The Phase Interaction Panel for the Mixture Model
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在Slip Velocity下面，你可以通过在附近下拉列表中选择合适的项目给与主相相关的第
二相指定滑流速度函数。
1． Select maninnen-et-al (the default) to use the algebraic slip method of Manninen et
al. [ 150], described in Section 20.3.4.
2． Select none if the secondary phase has the same velocity as the primary phase (i.e., no
slip velocity). 3． Select