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How to calculate convective and radiative heat flux ?
Posted Dec 13, 2021, 5:39 a.m. EST Version 5.6 1 Reply
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Hello,
I am trying to understand the method to calculate convective heat transfer and radiative heat transfer in comsol. The geometry is a simple rectangle (2D case). Two opposite sides are insulated and other two opposite sides have heat flux boundary condition with respective temperature and h values. Material selection is air.
I have surface to surface radiation model for radiation. The two sides which have heat flux boundary condition are selected as diffuse surface and emissivity values are defined.
When I look at the results convective and radiative heat transfers are zero. But the conductive heat flux has some value. I do not understand what is going in the calculation.
Can someone explain how to find these values?
Thank you.
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Hello,
In fact, convective flux accounts for displacement of fluid, which is achieved with Non-isothermal multiphysics, with Laminar or Turbulent Flow physics. In the solid-fluid boundary, heat flux is accounted simply as Normal conduction.