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The default option for the Line Heat Source node is Solid, which specifies that the heat source Ql 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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If General source is selected, enter a value for the distributed heat source, Ql in unit power per unit length. A positive Ql corresponds to heating while a negative Ql corresponds to cooling.
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See Built-In Operators in the COMSOL Multiphysics Reference Manual for additional information about the diskavg operator.
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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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