- area_increase_factorFunctor for the ratio of the total surface area with fins to the base surface area. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:Functor for the ratio of the total surface area with fins to the base surface area. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
- fin_area_fractionFunctor for the fraction of the total surface area corresponding to fins. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:Functor for the fraction of the total surface area corresponding to fins. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
- fin_efficiencyFin efficiency functor. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:Fin efficiency functor. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
FinEnhancementFactorFunctorMaterial
This functor material computes the enhancement factor for a convective heat transfer condition due to extended surfaces such as fins.
Formulation
Consider the convective heat transfer rate at a surface with area without the addition of any fins:
where
is the heat transfer coefficient,
is the surface temperature, and
is the fluid temperature.
The addition of extended surfaces such as fins to the surface enhances this heat transfer rate by a factor :
(1)The fin efficiency characterizes the performance of a single fin and is defined as the ratio of the heat transfer rate through the fin to the theoretical maximum heat transfer rate through the fin (Incropera et al., 2002):
where is the surface area of the fin.
The total surface efficiency characterizes the performance of an array of fins on a surface, not just a single fin, as does, and is defined as the ratio of the total heat transfer rate of the entire surface to the theoretical maximum heat transfer rate (Incropera et al., 2002):
(2)(3)Combining Eq. (1), Eq. (2), and Eq. (3) gives the definition of the enhancement factor:
where is the total surface area, including fins. The total efficiency is computed from the fin efficiency and the fin area ratio (Incropera et al., 2002):
where is the surface area of all fins on the surface.
Usage
This functor material creates a functor material property for the enhancement factor with the name given by the parameter "fin_enhancement_factor_name".
The quantities , , and are provided by the functor parameters "fin_efficiency", "fin_area_fraction", and "area_increase_factor", respectively.
Input Parameters
- blockThe list of blocks (ids or names) that this object will be applied
C++ Type:std::vector<SubdomainName>
Controllable:No
Description:The list of blocks (ids or names) that this object will be applied
- declare_suffixAn optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Unit:(no unit assumed)
Controllable:No
Description:An optional suffix parameter that can be appended to any declared properties. The suffix will be prepended with a '_' character.
- execute_onALWAYSThe list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
Default:ALWAYS
C++ Type:ExecFlagEnum
Controllable:No
Description:The list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
- fin_enhancement_factor_namefin_enhancement_factorName to give the fin enhancement factor functor material property. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
Default:fin_enhancement_factor
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:Name to give the fin enhancement factor functor material property. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
Optional Parameters
- control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
- enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:Yes
Description:Set the enabled status of the MooseObject.
- implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True
C++ Type:bool
Controllable:No
Description:Determines whether this object is calculated using an implicit or explicit form
- seed0The seed for the master random number generator
Default:0
C++ Type:unsigned int
Controllable:No
Description:The seed for the master random number generator
Advanced Parameters
- output_propertiesList of material properties, from this material, to output (outputs must also be defined to an output type)
C++ Type:std::vector<std::string>
Controllable:No
Description:List of material properties, from this material, to output (outputs must also be defined to an output type)
- outputsnone Vector of output names where you would like to restrict the output of variables(s) associated with this object
Default:none
C++ Type:std::vector<OutputName>
Controllable:No
Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object
Outputs Parameters
References
- Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine, and others.
Fundamentals of Heat and Mass Transfer.
Wiley New York, sixth edition, 2002.[BibTeX]