Heat Flux, interface (Heat Transfer in Shells Interface)

This node adds a heat flux q0 on the exterior interfaces of a shell and, for the case of a layered shell, at the interfaces between its layers.

Interface Selection

Set the interfaces for which the heat flux should be applied. These can be internal interfaces between layers or the top and bottom surfaces. Select the applicable layers (the default setting is ) in the list. If no layered materials have been included yet, there is a shorthand available for creating a , a , or a (the plus, next to the setting).

For a , the heat flux is applied on both sides by default. Unselect the and check boxes for another behavior. This setting has no effect unless the temperature differs from one side of the boundary to the other.

When a layered material stack or link is selected from the list, unselect the check boxes corresponding to layer interfaces where the node should not be applied in the table.

You can visualize the selected interfaces by clicking the and buttons.

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For a general description of layer and interface selections, see The Layer Selection and Interface Selection Sections.

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You can provide material parameters with a through-thickness variation by explicitly or implicitly using expressions containing the extra dimension coordinate as described in Using the Extra Dimension Coordinates.


	The desired selection for the node may correspond to boundaries with different layered materials. The All layered materials option allows to gather these materials to make the desired selection applicable for the node on the union of the boundaries where the layered materials are defined. See Layered Material, Layered Material Link, Layered Material Stack, Layered Material Link (Subnode), and Single Layer Material in the COMSOL Multiphysics Reference Manual.

Material Type

Select an option in the list to specify if the inputs of the section are defined in the material or spatial frame:

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The option specifies that the heat fluxes q0 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 default option for the node is , which defines q0 in the spatial frame. No frame conversion is needed.

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The option uses the option selected in the list of the section of the material applied on the domain on which the node is active.


	This option has no effect when the component does not contain a moving frame because the material and spatial frames are identical in such cases. With a Deformed Geometry or a Moving Mesh interface, the heat transfer features automatically account for deformation effects of the material and spatial frames on heat transfer properties. In particular the effects of volume changes on the density are considered. See Handling Frames in Heat Transfer and Material and Spatial Frames for details.

Heat Flux

These settings are the same as for the Heat Flux node.


	In 2D the heat flux contribution is multiplied by dz to account for the out-of-plane thickness.

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Theory for Heat Transfer in Thin Structures

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The Heat Transfer Coefficients

Location in User Interface

Context menus

Ribbon

Physics Tab with selected in the model tree: