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When the Shell type is Layered shell in the Shells Properties section of the parent node, the same layered material is used in the Heat Flux node. This option is not editable, 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 parent feature in the Heat Flux node. You can change to User defined and override the parent node 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 Solid option specifies that the heat flux 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 Heat Flux subnode is Nonsolid, which defines q0 in the spatial frame. No frame conversion is needed.
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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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If General inward heat flux is selected, it adds q0 to the total flux across the selected edges. Enter a value for q0 to represent a heat flux that enters the layer. For example, any electric heater is well represented by this condition and its geometry can be omitted.
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If Convective heat flux is selected, it adds q0 in the form q0 = h ⋅ (Text − T). Enter the Heat transfer coefficient h and the External temperature Text. This latter value depends on the geometry and the ambient flow conditions. For User defined, enter a value or expression. Else, select an Ambient temperature defined in an Ambient Properties node under Definitions. This option is only available when the Layer type is Thermally thin approximation or General in the parent feature.
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If Nucleate boiling heat flux is selected, it adds q0 estimated with the Rohsenow’s correlation. See Nucleate Boiling Heat Flux for the settings. This option is only available when the Layer type is Thermally thin approximation or General in the parent feature.
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3D Components: If Heat rate is selected, it adds q0 in the form q0 = P0 ⁄ A where A is equal to the area of the edge selection. Enter the heat rate P0.
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