33.5.3 Phase Interaction Dialog Box

The Phase Interaction dialog box allows you to define the interaction between phases. It is opened from the Phases task page. The items that appear in the Phase Interaction dialog box will depend on which multiphase model you are using. See Sections  24.3.4, 24.4.1, and 24.5.2 for details about the items below.

Controls

Wall Adhesion   enables the specification of a wall adhesion angle. (The angle itself, as defined in this figure in the separate Theory Guide , will be specified in the Wall dialog box.) This item will appear only for the VOF and Eulerian models.

Virtual Mass   includes the "virtual mass force'' ( $F_{\rm vm}$ in this equation in the separate Theory Guide) that is present when a secondary phase accelerates relative to the primary phase. This item appears only for the Eulerian model.

Drag   displays the Drag Coefficient inputs. This tab is active only for the Eulerian and mixture models.

Drag Coefficient   specifies the drag function for each pair of phases. This section of the dialog box appears only for the Eulerian and mixture models. See Section  24.5.2 for information about the available options.

Lift   displays the Lift Coefficient inputs. This tab is active only for the Eulerian model.

Lift Coefficient   specifies the lift function for each pair of phases. This section of the dialog box appears only for the Eulerian model. See Section  24.5.2 for information about the available options.

Collisions   displays the Restitution Coefficient inputs.

Restitution Coefficient   specifies the restitution coefficient for collisions between each pair of granular phases, and for collisions between particles of the same granular phase. It is relevant only if two or more granular phases are involved. See Section  24.5.2 for information about the available options.

Slip   displays the Slip Velocity inputs. This tab is active only for the mixture model.

Slip Velocity   specifies the slip velocity function for each secondary phase with respect to the primary phase. See Section  24.4.1 for information about the available options.

Heat   displays the Heat Transfer Coefficient inputs. This tab is active only for the Eulerian model when the energy equation is active.

Heat Transfer Coefficient   specifies the heat transfer coefficient function between each pair of phases. See Section  24.5.5 for information about the available options.

Mass   displays the Mass Transfer Function inputs.

Number of Mass Transfer Mechanisms   specifies the number of mass transfer mechanisms in your simulation. See Section  24.2.8 for information about the available options.

Reactions   allows you to define multiple heterogeneous reactions and stoichometry.

Total Number of Heterogeneous Reactions   specifies the total number of reactions (volumetric reactions, wall surface reactions, and particle surface reactions). See Section  24.2.7 for information about the available options.

Heterogeneous Stiff Chemistry Solver   is used in inter-phase reaction mechanisms containing numerically stiff reactions. This option can improve convergence and is available for transient Eulerian multiphase simulations.

Reaction Name   allows you to enter a name for the reaction.

ID   enables you to set the reaction ID for each reaction.

Number of Reactants   allows you to specify the number of reactants that are involved in the reaction.

Number of Products   allows you to specify the number of products that are involved in the reaction.

Phase   drop-down list allows you to select the phase that is involved in the reaction.

Species   drop-down list allows you to select the species.

Stoich. Coefficient   allows you to set the stoichiometric coefficient.

Reaction Rate Function   allows you to choose a user-defined function or a population balance mechanism for the reaction rate.

Surface Tension   includes the effects of surface tension along the fluid-fluid interface.

Surface Tension Coefficients   specify the surface tension coefficient, $\sigma$ in this equation in the separate Theory Guide , for each pair of phases. See Section  24.3.4 for details.