FEM ConstraintHeatflux: Difference between revisions

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{{Docnav
{{docnav|[[FEM_ConstraintInitialTemperature|Constraint initial temperature]]|[[FEM_ConstraintTemperature|Constraint temperature]]|[[FEM_Module|FEM]]|IconL=FEM_ConstraintInitialTemperature.png|IconC=Workbench_FEM.svg|IconR=FEM_ConstraintTemperature.png}}
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{{GuiCommand
{{GuiCommand|Name=FEM ConstraintHeatflux|MenuLocation=Model → Thermal Constraints → Constraint heatflux||Workbenches=[[Fem Workbench|FEM]]|Shortcut=|SeeAlso=[[FEM_tutorial|FEM tutorial]]}}
|Name=FEM ConstraintHeatflux
|MenuLocation=Model → Thermal boundary conditions and loads → Heat flux load
|Workbenches=[[FEM_Workbench|FEM]]
|SeeAlso=[[FEM_tutorial|FEM tutorial]]
}}


==Description== <!--T:2-->
==Description== <!--T:2-->


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This constraint specifies film heat transfer of a surface at temperature ''T'' and with a film coefficient ''h'' to the environment or sink at temperature ''T<sub>0</sub> ''. The convective heat flux ''q'' will satisfy: '''''q = h(T -T<sub>0</sub>)'''''
Defines a convective heat flux load on a surface at a temperature ''T'' with a film coefficient ''h'' and with the environment (sink) temperature ''T<sub>0</sub>''. The convective heat flux ''q'' will satisfy: '''''q = h(T -T<sub>0</sub>)'''''. Optionally, can also define a regular surface heat flux load.


==Usage== <!--T:3-->
==Usage== <!--T:3-->


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# There are several ways to invoke the command:
#Click on [[Image:FEM ConstraintHeatflux.png|32px]] or choose {{KEY|Model}} → '''Thermal Constraints''' → {{KEY|[[Image:FEM ConstraintHeatflux.png|32px]] Constraint heatflux}} from the top menu.
#* Press the {{Button|[[Image:FEM_ConstraintHeatflux.svg|16px]] [[FEM_ConstraintHeatflux|Heat flux load]]}} button.
⚫
#Select in the 3D-view the surface(s) the constraint should be applied to.
#* Select the {{MenuCommand|Model → Thermal boundary conditions and loads → [[Image:FEM_ConstraintHeatflux.svg|16px]] Heat flux load}} option from the menu.
⚫
#Enter the desired surface temperature, film coefficient and environment temperature.
⚫
# In the [[3D_view|3D view]] select the face(s) the heat flux load should be applied to.
⚫
# Enter the desired heat transfer coefficient and environment temperature.


==Limitations== <!--T:4-->
===Option=== <!--T:13-->

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By default, this feature defines a convective heat flux. By using the option '''Surface heat flux''', one can specify a heat flux value in Watts per surface area (W/m^2).


==Notes== <!--T:5-->
==Notes== <!--T:5-->


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#The constraint uses the *FILM card in CalculiX. The heatflux constraint is explained at http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node203.html
* The heat flux load uses the *FILM card in CalculiX. It is explained at http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node203.html
* The '''Surface heat flux''' option uses the *DFLUX card in CalculiX: http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node188.html



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|[[FEM_ConstraintTemperature|Constraint temperature]]
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|IconR=FEM_ConstraintTemperature.svg
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Latest revision as of 18:25, 18 November 2023

Other languages:

FEM ConstraintHeatflux

Menu location
Model → Thermal boundary conditions and loads → Heat flux load
Workbenches
FEM
Default shortcut
None
Introduced in version
-
See also
FEM tutorial

Description

Defines a convective heat flux load on a surface at a temperature T with a film coefficient h and with the environment (sink) temperature T0. The convective heat flux q will satisfy: q = h(T -T0). Optionally, can also define a regular surface heat flux load.

Usage

  1. There are several ways to invoke the command:
    • Press the Heat flux load button.
    • Select the Model → Thermal boundary conditions and loads → Heat flux load option from the menu.
  2. In the 3D view select the face(s) the heat flux load should be applied to.
  3. Enter the desired heat transfer coefficient and environment temperature.

Option

By default, this feature defines a convective heat flux. By using the option Surface heat flux, one can specify a heat flux value in Watts per surface area (W/m^2).

Notes

FEM

Constraints

User documentation
Retrieved from "http://wiki.freecad.org/index.php?title=FEM_ConstraintHeatflux&oldid=1326217"