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If From heat balance (the default) is selected, the temperature is computed as the solution of a reduced form of the heat equation due to spatial homogeneity. See Equation 4-34.
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If From prescribed temperature is selected, the temperature is set to the domain Temperature T0 that needs to be specified. For User defined, enter a value or expression for the Temperature T0. Else, select an Ambient temperature defined in an Ambient Properties node under Definitions.
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It is not possible to couple an Isothermal Domain with the Laminar Flow interface through the Nonisothermal Flow multiphysics condition.
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When Surface-to-surface radiation is activated, the Opacity (Surface-to-Surface Radiation Interface) subnode is automatically added to the entire selection, with Transparent option selected. The domain selection can’t be edited. To set some part of the domain as opaque, add a new Opacity (Surface-to-Surface Radiation Interface) subnode from the context menu (right-click the parent node) or from the Physics toolbar, Attributes menu.
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Natural Convection Cooling of a Vacuum Flask: Application Library path Heat_Transfer_Module/Tutorials,_Forced_and_Natural_Convection/vacuum_flask
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