How to set the boundary conditions for constant flux

MFiX How to
#1

Hello everyone, I’m a beginner of mfix. I try to set a constant heat flux boundary condition in my example, but I find that I can only set the temperature gradient K/m instead of W/m2,

  1. Whether I need to divide the constant heat flux (W/m2) by the thermal conductivity of fluid and particle to obtain their respective temperature gradients;
  2. In my example, there is only fluid near the wall, and the particle flows far away. How can I set the temperature gradient of the particle phase.
    Look forward to your guidance.
    Thanks.
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#2
  1. Yes.
  2. This BC is only available for the gas phase or the solids phase in TFM. Setting a temperature gradient along a wall in TFM has no effect if there are no particles near the wall (void fraction is one in the cell next to a wall).
1 Like
#3

Thank you for your answer.
If I want to calculate that the particles are heated by constant radiant heat flux, can I set the temperature gradient directly according to the above method? There are no particles in the grid near the wall.