Segregated Fluid Film Temperature Model Reference

This model is available when an energy model is included for Fluid Film simulations with the physics continuum defined with a single phase or Eulerian Multiphase (EMP) multiphase flow model.

The Segregated Multiphase Temperature model solves the total energy equation with temperature as the solved variable. Enthalpy is then computed from temperature according to the equation of state. For Fluid Film with EMP simulations, you are recommended to set the heat of formation and standard state temperature properties for each film phase material. These two parameters, along with the specific heat of the film phase, allow the enthalpy for a particular phase to be fully defined.

These reference condition inputs have been named Heat of Formation and Standard State Temperature as commonly used in reacting flows. However, any other consistent set of reference data can be used instead.

Table 1. Segregated Fluid Film Temperature Model Reference
Theory	See Energy Equation.
Provided By	[film phase] > Models > Fluid Film Segregated Energy
Example Node Path	For Film-Physics simulations: Continua > Physics 1 > Models > Fluid Film > [phase] > Models > Segregated Fluid Film Temperature For Film-EMP simulations: Continua > Physics 1 > Models > Fluid Film > [phase] > Models > Segregated Fluid Film Temperature
Requires	Physics continuum selections: Material: Any, except Solid, Multi-Component Solid Multiphase Model: Eulerian Multiphase (EMP) (if you previously selected Multiphase) Optional Models: Segregated Fluid Enthalpy, Segregated Fluid Temperature, Phase Coupled Energy, Fluid Film Flow: Segregated Flow Fluid film phase selections: A fluid film phase Material: Any
Properties	Convection, Secondary Gradients, Flow Boundary Diffusion See Segregated Fluid Film Temperature Properties.
Activates	Materials	Heat of Formation, Specific Heat, Standard State Temperature, Thermal Conductivity. See Material Properties .
	Region Settings	See Region Settings.
	Solvers	Segregated Energy See Segregated Energy Solver for Multiphase.

Segregated Fluid Film Temperature Properties

Convection

For guidance on selecting a convection, see Finite Volume Discretization.


Method	Corresponding Method Node
1st-order Selects the first-order convection.	None.
2nd-order Selects the second-order convection.	None.
MUSCL 3rd-order/CD Selects the hybrid MUSCL 3rd-order/CD convection scheme.	Bounded Differencing Upwind Blending Factor Specifies the proportion of upwind differencing, $ς_{u b f}$ related to Eqn. (891). The default value is 1.0. The default provides the most robustness for the scheme. Reducing it would, in principle, increase accuracy. However, unless you are thoroughly familiar with the theoretical aspects of bounded differencing, do not change this property. The default value reflects optimization for accuracy and performance.

Secondary Gradients

Neglect or include the boundary secondary gradients for diffusion and/or the interior secondary gradients at mesh faces

On
Include both secondary gradients.
Off
Exclude both secondary gradients.
Interior Only
Include the interior secondary gradients only.
Boundaries Only
Include the boundary secondary gradients only.

Flow Boundary Diffusion

Activate or deactivate the flow-boundary diffusion fluxes that are given in Eqn. (898). A realistic temperature value must be set on flow boundaries when this option is activated. This option is activated by default.

Material Properties

These properties can be set for each film phase and for each component of film multi-component phases:

Heat of Formation

Available for Fluid Film-EMP simulations, Film-Physics Continuum simulations with Evaporation/Condensation or Boiling, and Film-VOF simulations with Evaporation/Condensation. See Using the Heat of Formation.

Specific Heat

Method	Corresponding Method Node
Polynomial in T	Available for each film phase and for each component of film multi-component phases. Enthalpy is calculated as the integral of specific heat over T in the interval between the specified Standard State Temperature and T, plus the heat of formation. The heat of formation defaults to zero if the corresponding material property value is not specified. See Using Polynomial in T.
Mass-Weighted Mixture	Available at the phase level for multi-component phases. Specify the Specific Heat for each component of the multi-component phase. See Using the Mass-Weighted Mixture.

Method

Corresponding Method Node

Polynomial in T

Available for each film phase and for each component of film multi-component phases.

Enthalpy is calculated as the integral of specific heat over T in the interval between the specified Standard State Temperature and T, plus the heat of formation. The heat of formation defaults to zero if the corresponding material property value is not specified.

See Using Polynomial in T.

Mass-Weighted Mixture

Available at the phase level for multi-component phases.

Specify the Specific Heat for each component of the multi-component phase.

See Using the Mass-Weighted Mixture.

Standard State Temperature

Available only for Fluid Film-EMP simulation. See Using the Standard State Temperature.

Thermal Conductivity

See Using the Thermal Conductivity Method.

Region Settings

Available for the shell region only.

Energy Source Option: See Energy Source Option.