
Density
sets the material density. You may set a constant value, or select one of the other methods from the dropdown list above the real number field. See Section
8.3 for instructions on setting density.

Cp
sets the constantpressure specific heat of the material. You may set a constant value, or select one of the other methods from the dropdown list above the real number field. See Section
8.7 for instructions on setting specific heat.

Thermal Conductivity
sets the thermal conductivity of the material. You may set a constant value, or select one of the other methods from the dropdown list above the real number field. See Section
8.5 for instructions on setting thermal conductivity.

Viscosity
sets the viscosity of the material. You may set a constant value, or select one of the other methods from the dropdown list above the real number field. See Section
8.4 for instructions on setting viscosity.

Molecular Weight
sets the molecular weight of the material. It is used to derive the gas constant of the material.

Standard State Enthalpy
specifies the formation enthalpy of a fluid material for a reacting flow. See Section
8.10 for details.

Standard State Entropy
specifies the standard state entropy of a fluid material for a reacting flow. This input is used only if the fluid material is involved in a reversible reaction. See Section
8.11 for details.

Reference Temperature
specifies the reference temperature for the
Heat of Formation.

LJ Characteristic Length
specifies the kinetic theory parameter
for a fluid material. See Section
8.13 for details.

LJ Energy Parameter
specifies the kinetic theory parameter
for a fluid material. See Section
8.13 for details.

Absorption Coefficient
specifies the absorption coefficient
for radiation heat transfer. See Section
8.8 for details. If you choose the
wsggmuserspecified option from the dropdown list next to
Absorption Coefficient, the
WSGGM User Specified dialog box will open.

Scattering Coefficient
specifies the scattering coefficient
for radiation heat transfer (only for the P1, Rosseland, or DO radiation model). See Section
8.8 for details.

Scattering Phase Function
specifies an
isotropic (by default) or
linearanisotropic scattering function. If you are using the DO model,
deltaeddington and
userdefined scattering functions are also available. See Section
8.8 for details. If you choose
deltaeddington, the
DeltaEddington Scattering Function dialog box will open.

Refractive Index
specifies the refractive index for the material. It is used only when semitransparent media are modeled with the DO radiation model.

Mixture Species
specifies the names of the species that comprise a mixture material. To check or modify these names, click on the
Edit... button to open the
Species dialog box. This property appears only for mixture materials.

Reaction
displays the reaction mechanism being used when you are modeling finiterate reactions.
finiterate appears if
Laminar FiniteRate or
EddyDissipation Concept is selected in the
Species Model dialog box,
eddydissipation appears if
EddyDissipation is selected, and
finiterate/eddydissipation appears if
FiniteRate/EddyDissipation is selected.
Click
Edit... to open the
Reactions dialog box.

Mechanism
allows you to enable different reactions selectively in different geometrical zones. Click the
Edit button to open the
Reaction Mechanisms dialog box. See Section
15.1.3 for details.

Mass Diffusivity
contains a dropdown list of available methods for specifying the diffusion coefficients for the species in a mixture material. If you select
constantdiluteappx, you will enter a constant value in the field below. If you select
diluteapprox or
multicomponent, the
Mass Diffusion Coefficients dialog box will open, and you can specify the coefficients there. If you select
kinetictheory, you will need to specify the kinetic theory parameters for the individual fluid materials (species) that comprise the mixture. See Section
8.9 for details about specifying mass diffusivity.

Thermal Diffusion Coefficient
contains a dropdown list of available methods for specifying the thermal diffusion coefficients for the species in a mixture material. If you select
kinetictheory, you will need to specify the kinetic theory parameters for the individual fluid materials (species) that comprise the mixture. If you select
specified, the
Thermal Diffusion Coefficients dialog box will open, and you can specify the coefficients there. See Section
8.9.4 for details about specifying thermal diffusion coefficients.

Density of Unburnt Reactants
sets the density (
in
this equation in the separate
Theory Guide) of the unburnt products.

Temperature of Unburnt Reactants
sets the temperature (
in
this equation in the separate
Theory Guide) of the unburnt products.

Adiabatic Temperature of Burnt Products
(only for adiabatic premixed combustion models) specifies the value of the burnt products under adiabatic conditions,
in
this equation in the separate
Theory Guide.

Molecular Heat Transfer Coefficient
specifies the molecular heat transfer coefficient (
in
this equation in the separate
Theory Guide) for use with the premixed combustion model. See Chapter
17 for details.

Laminar Flame Speed
specifies the value of
in
this equation in the separate
Theory Guide.

Critical Rate of Strain
specifies the value of
in
this equation in the separate
Theory Guide.

Heat of Combustion
(only for nonadiabatic premixed combustion models) specifies the value of
in
this equation in the separate
Theory Guide.

Unburnt Fuel Mass Fraction
(only for nonadiabatic premixed combustion models) specifies the value of
in
this equation in the separate
Theory Guide.

Thermal Expansion Coefficient
specifies the thermal expansion coefficient (
in Equation
13.22) for use with the Boussinesq approximation.
See Section
13.2.4 for details.

Droplet Surface Tension
specifies the value of the droplet surface tension (
in
this equation in the separate
Theory Guide).

Latent Heat
is the latent heat of vaporization,
, required for phase change from an evaporating liquid droplet or for the evolution of volatiles from a combusting particle. See Section
23.5 for details.

Thermophoretic Coefficient
specifies the thermophoretic coefficient (
in
this equation in the separate
Theory Guide), and appears when the thermophoretic force is included in the discrete phase calculation.

Vaporization Temperature
is the temperature,
, at which the calculation of vaporization from a liquid droplet or devolatilization from a combusting particle is initiated by
ANSYS FLUENT. See Section
23.5 for details.

Boiling Point
is the temperature,
, at which the calculation of the boiling rate equation is initiated by
ANSYS FLUENT. See Section
23.5 for details.

VaporParticleEquilibrium
is the selected approach for the calculation of the vapor concentration of the components at the surface. This can be Raoult's law (
this equation in the separate
Theory Guide), the PengRobinson real gas model (
this equation in the separate
Theory Guide), or a userdefined function that provides this value.

Volatile Component Fraction
(
) is the fraction of a droplet particle that may vaporize via Laws 2 and/or 3 (
this section in the separate
Theory Guide). For combusting particles, it is the fraction of volatiles that may be evolved via Law 4 (
this section in the separate
Theory Guide). See Section
23.5 for details.

Binary Diffusivity
is the mass diffusion coefficient,
, used in the vaporization law, Law 2. This input is also used to define the mass diffusion of the oxidizing species to the surface of a combusting particle,
. See Section
23.5 for details.

Saturation Vapor Pressure
is the saturated vapor pressure,
, defined as a function of temperature, which is used in the vaporization law, Law 2. See Section
23.5 for details.

Heat of Pyrolysis
is the heat of the instantaneous pyrolysis reaction,
, that the evaporating/boiling species may undergo when released to the continuous phase. The heat of pyrolysis should be input as a positive number for exothermic reaction and as a negative number for endothermic reaction. The default value of zero implies that the heat of pyrolysis is not considered. See Section
23.5 for details.

Degrees of Freedom
specifies the kinetic theory parameter
, which is the number of nodes of energy storage. This parameter is required only if you are defining specific heat via kinetic theory. See Section
8.13 for details.

Particle Emissivity
is the emissivity of particles in your model,
, used to compute radiation heat transfer to the particles when the P1 or DO radiation model is active and particle radiation interaction is enabled in the
Discrete Phase Model dialog box. See Section
23.5 for details.

Particle Scattering Factor
is the scattering factor,
, due to particles in the P1 or DO radiation model. Note that this property will appear only if particle radiation interaction is enabled in the
Discrete Phase Model dialog box. See Section
23.5 for details.

Particle Scattering Factor

Swelling Coefficient
is the coefficient,
, which governs the swelling of the coal particle during the devolatilization law, Law 4. A swelling coefficient of unity (the default) implies that the coal particle stays at constant diameter during the devolatilization process. See Section
23.5 for details.

Burnout Stoichiometric Ratio
is the stoichiometric requirement,
, for the burnout reaction, in terms of mass of oxidant per mass of char in the particle. See Section
23.5 for details.

Combustible Fraction
is the mass fraction of char,
, in the coal particle, i.e., the fraction of the initial combusting particle that will react in the surface reaction, Law 5. See Section
23.5 for details.

React. Heat Fraction Absorbed by Solid
is the parameter
, which controls the distribution of the heat of reaction between the particle and the continuous phase. The default value of zero implies that the entire heat of reaction is released to the continuous phase. See Section
23.5 for details.

Heat of Reaction for Burnout
is the heat released by the surface char combustion reaction, Law 5. This parameter is input in terms of heat release (e.g., Joules) per unit mass of char consumed in the surface reaction. See Section
23.5 for details.

Devolatilization Model
defines which version of the devolatilization model, Law 4, is being used. If you want to use the default constant rate devolatilization model, retain the selection of
constant in the dropdown list to the right of
Devolatilization Model and input the rate constant
in the field below the list.
Choose
singlerate,
twocompetingrates, or
cpdmodel in the dropdown list to activate one of the optional devolatilization models (the single kinetic rate model, two kinetic rates model, or CPD model, as described in
this section in the separate
Theory Guide).
When the single kinetic rate model (
singlerate) is selected, the
Single Rate Devolatilization dialog box will appear; when the two competing rates model (
twocompetingrates) is selected, the
Two Competing Rates Model dialog box will appear; and when the CPD model (
cpdmodel) is selected, the
CPD Model dialog box will appear.
See Section
23.5 for details.

Combustion Model
defines which version of the surface char combustion law (Law 5) is being used. If you want to use the default diffusionlimited rate model, retain the selection of
diffusionlimited in the dropdown list. No additional inputs are necessary, because the binary diffusivity defined above will be used in
this equation in the separate
Theory Guide.
To use the kinetics/diffusionlimited rate model for the surface combustion model, select
kinetics/diffusionlimited in the dropdown list and enter the parameters in the resulting
Kinetics/DiffusionLimited Combustion Model dialog box.
To use the intrinsic model for the surface combustion model, select
intrinsicmodel in the dropdown list and enter the parameters in the resulting
Intrinsic Combustion Model dialog box.
To use the multiple surface reactions model, select
multiplesurfacereactions in the dropdown list.
See Section
23.5 for details.

Pure Solvent Melting Heat
specifies the latent heat for the melting and solidification model (
in
this equation in the separate
Theory Guide).

Solidus Temperature
specifies the solidus temperature for the melting and solidification model (
in
this equation in the separate
Theory Guide).

Liquidus Temperature
specifies the liquidus temperature for the melting and solidification model (
in
this equation in the separate
Theory Guide).

Pure Solvent Melting Temperature
specifies the melting temperature of pure solvent (
in
this equation and
this equation in the separate
Theory Guide) for the melting and solidification model when species transport has also been enabled. The solvent is the last species material of the mixture material.

Eutectic Temperature
is the lowest alloy melting temperature, which depends on the relative proportions of the mixture composition of the Eutectic specie mass fractions.

Slope of Liquidus Line
specifies the slope of the liquidus surface with respect to the concentration of the solute fluid (
in
this equation and
this equation in the separate
Theory Guide). It is not necessary to specify this value for the solvent. Note that this option is available only for the melting and solidification model when species transport has also been enabled.

Partition Coefficient
specifies the partition coefficient with respect to the concentration of the solute fluid (
in
this equation and
this equation in the separate
Theory Guide). It is not necessary to specify this value for the solvent. Note that this option is available only for the melting and solidification model when species transport has also been enabled.

Diffusion in Solid
specifies the rate of diffusion in the solid. Note that this option is available only for the melting and solidification model when species transport has also been enabled.

UDS Diffusivity
specifies the diffusion coefficient for a userdefined scalar. This material property is available in the
Create/Edit Materials dialog box when you specify one or more userdefined scalars in the
User Defined Scalars dialog box.If you select
definedperuds, you will need to specify the diffusion coefficient for each userdefined scalar transport equation in the
UDS Diffusion Coefficients dialog box.
When you are viewing the database, additional properties may be displayed. However, after you copy the material to the local area, only the properties with relevance to the current problem will be displayed.