Heat Source (Heat Transfer in Shells Interface)
This node models a linear heat source (or sink). It adds a heat source q = Qb or q = Pb ⁄ A. A positive q is heating and a negative q is cooling.
Edge Selection
Select the edges on which to apply the heat source. The Restrict to layered edges check box makes the node applicable only if a layered material is defined on the edge. If a layered material (Material with Layer thickness specified, Single Layer Material, Layered Material Link, or Layered Material Stack) is available, its name is then displayed beside the edge index (for example, slmat1), otherwise the edge is marked as not applicable.
Note that when the Shell type is Nonlayered shell in the Shells Properties section of the parent interface, the Restrict to layered boundaries check box is not editable.
In addition, in 2D, edges are modeled as points and this section is named Point Selection, containing a Restrict to layered points check box.
Shell Properties
Different settings are available, depending on the settings in the Shell Properties section of the parent interface:
When the Shell type is Layered shell in the Shells Properties section of the parent interface, the same layered material is used in the Heat Source node, but you can limit the contribution to individually selected layers by clearing the Use all layers check box. For a given Layered Material Link or Layered Material Stack, you get access to a list of check boxes for the selection of the individual layers.
When the Shell type is Nonlayered shell in the Shells Properties section of the parent interface, the Thickness is taken From physics interface in the Heat Source node. You can change to User defined and override the interface setting with a specific value or expression for Lth.
You can visualize the selected layered materials and layers in each layered material by clicking the Layer Cross Section Preview and Layer 3D Preview buttons.
Material Type
Select an option in the Material type list to specify if the inputs of the Heat Source section are defined in the material or spatial frame:
The default option for the Heat Source node is Solid, which specifies that the heat source Qb is defined in the material frame. Because the heat transfer variables and equations are defined in the spatial frame, the inputs are internally converted to the spatial frame. See Conversion Between Material and Spatial Frames for details.
The Nonsolid option defines Qb in the spatial frame. No frame conversion is needed.
The From material option uses the option selected in the Material type list of the Material Properties section of the material applied on the domain on which the node is active.
Boundary Heat Source
Click the General source (the default) or Heat rate button.
For General source, enter the boundary heat source Qb. A positive Qb is heating and a negative Qb is cooling.
For Heat rate enter the heat rate Pb. In this case Qb = Pb ⁄ A, where A is the total area of the selected edges (where A is the product of the layer’s thickness ds by the total length of the selected edges).
In 2D components, the equation contains an additional factor, dz, to account for the out-of-plane thickness. This is because the selected points correspond to edges in a 3D geometry.
Location in User Interface
Context Menus
Ribbon
Physics Tab with Heat Transfer in Shells selected: