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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.
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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.
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See Layered Material, Layered Material Link, Layered Material Stack, Layered Material Link (Subnode), and Single-Layer Materials in the COMSOL Multiphysics Reference Manual.
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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.
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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.
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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.
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You can specify the source to be a harmonic perturbation in a frequency domain analysis. To mark the source as being a harmonic perturbation, right-click the node and choose Harmonic Perturbation. Note that this updates the node’s icon. See Theory for Harmonic Heat Transfer for more details.
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