Interphase Reactions Workflow: Fluid Film

You can simulate chemical reactions between a fluid film phase and the surrounding gas phase using the Interphase Reaction model.

The Interphase Reaction model requires the Multi-Component Liquid model for the fluid film phase. The steps in this workflow are intended to follow on from the initial steps in the Reacting Flow General Workflow and after the steps in Setting Up a Fluid Film Simulation.
  1. Maintain the existing model selections and make sure that Auto-Select recommended models is activated. Right-click Continua > Physics 1 > Models and select the following model:
    Group Box Model
    Optional Models Multiphase Interaction
  2. Select the gas components.
    1. Right-click Continua > Physics 1 > Models > Multi-Component Gas > Gas Components and select Select Mixture Components.
    2. In Select Mixture Components window select components from the Material Databases.
  3. Select the liquid components.
    1. Right-click Continua > Physics 1 > Models > Fluid Film > Fluid Film Phases > Phase 1 > Models > Multi-Component Liquid > Liquid Components and select Select Mixture Components.
    2. In Select Mixture Components window select components from the Material Databases.
  4. Right-click Continua > [physics continuum] > Models > Multiphase Interaction > Phase Interactions and create a new phase interaction.
  5. Right-click the Phase Interactions > [phase interaction] > Models node and select the following model:
    Group Box Model
    Phase Interaction Topology Film-Physics Continuum Interaction

    Select any further optional models as necessary.

  6. Select the Film-Physics Continuum Interaction node and set Fluid Film Phase to [fluid film phase].
  7. Right-click the node Phase Interactions > Phase Interaction 1 > Models and select the following model:
    Group Box Model
    Optional Models Interphase Reaction

    See Fluid Film Interphase Reaction Model Reference

  8. Define the interphase reactions between the fluid film phase and the neighbouring gas phase:
    1. Right-click the Models > Interphase Reaction > Reactions node and select New Reaction.
    2. Right-click the [reaction] > Reactants node, select Add Reactant and select the liquid and gas mixture components that participate in the reactions.
    3. Right-click the [reaction] > Products node, select Add Products and select the liquid and gas mixture components that form the products of the reactions.
  9. Specify the user reaction coefficient (ki in Eqn link). Depending on how you want to specify the coefficient, do one of the following:
    User Reaction Coefficient MethodSteps
    To use constant, table, or field functions from the gas phase:
    1. Select the [reaction] > Properties > Reaction Coefficient > User reaction coefficient node and specify the user reaction coefficient using the selected method.
    To use field functions from the fluid film phase, for example, the fluid film thickness $FluidFilmThickness: Map the fluid film phase field function from the fluid film side of the interface to the gas phase side of the interface:
    1. Right-click the Tools > Data Mappers node and select New Data Mapper > Surface Data Mapper.
    2. Select the [surface data mapper] node and set the following properties:
      Property Setting
      Source Surfaces Click (Custom Editor) and select the fluid film side of the interface between the fluid film and the gas.
      Scalar Field Functions Select the fluid film phase field function that you want to use in your user reaction coefficient definition, for example, FluidFilmThickness.
    3. Select the Target Specifications > [surface] node and set Target Entities to the gas phase side of the interface between the fluid film and the gas.
    4. Select the [surface data mapper] > Update node and activate Enabled.
    5. To specify the user reaction coefficient using the mapped fluid film phase field function, select the Reactions > [reaction] > Properties > Reaction Coefficient > User Reaction Coefficient node and set the following properties:
      Property Setting
      Method Field Function
      Scalar Function Select the mapped fluid film phase field function with the pre-fix MappedVertex. For example, for the fluid film thickness, select MappedVertexFluidFilmThickness

    For more information on data mappers, see Data Mappers.

  10. Return to the Reacting Flow General Workflow.