Out-of-Plane Heat Flux
Out-of-plane heat transfer mechanism is used to reduce a model geometry to 2D or even 1D when the temperature variation is small in one or more directions; for example, when the object to model is thin or slender. For the obtained 1D and 2D components, this node adds a heat flux q0, u for the upside heat flux and a heat flux q0, d for the downward heat flux to the right-hand side of the heat equation.
For example, in 2D components, heat transfer in solids and heat transfer in fluids are given by Equation 6-5 and Equation 6-6:
(6-5)
(6-6)
The convective heat flux adds the following contribution
Upside Inward Heat Flux
The available options are General inward heat flux and Convective heat flux. The settings are the same as for the Heat Flux node.
Downside Inward Heat Flux
The available options are General inward heat flux and Convective heat flux. The settings are the same as for the Heat Flux node.
See Out-of-Plane Heat Transfer for the formulation of out-of-plane heat transfer in 1D, 1D axisymmetric, and 2D geometries.
See also Out-of-Plane Domain Fluxes.
Upside and downside settings can be visualized by plotting the global normal vector (nx, ny, nz), that always points from downside to upside. Note that the normal vector (ht.nx, ht.ny, ht.nz) may be oriented differently.
See Tangent and Normal Variables in the COMSOL Multiphysics Reference Manual.
Out-of-Plane Heat Transfer for a Thin Plate: Application Library path Heat_Transfer_Module/Verification_Examples/thin_plate
Location in User Interface
Context menus
 Heat Transfer>Out-of-Plane Heat Flux
Heat Transfer in Solids>Out-of-Plane Heat Flux
Heat Transfer in Fluids>Out-of-Plane Heat Flux
Heat Transfer in Porous Media>Out-of-Plane Heat Flux
Heat Transfer in Building Materials>Out-of-Plane Heat Flux
Bioheat Transfer>Out-of-Plane Heat Flux
Ribbon
Physics Tab with interface as Heat Transfer, Heat Transfer in Solids, Heat Transfer in Fluids, Heat Transfer in Porous Media, Heat Transfer in Building Materials, or Bioheat Transfer selected:
Domains>interface>Out-of-Plane Heat Flux