I am trying to model the heat diffusion where I have uniform heat flux for a small rectangular portion of wall and rest of the wall is either is subjected to natural or forced convection or the zero heat flux condition. I want to know if I apply constant heat flux condition for (say) middle small rectangular portion, will the boundary condition for rest of the wall be captured as no heat flux condition(default or natural boundary condition).
I am having trouble visualizing how this furnace works. Do you have a flame trapped in a rectangular pipe only visible to a small rectangular portion of the furnace wall? Does this portion of the wall get hot enough to radiate a significant amount of heat to the rest of the furnace? Are there also process tubes being heated via radiation from the wall or are you only heating the wall? What happens to the flue gas? Does it flow along the wall and heat the rest of the wall and possibly a tube/pipe containing a flowing fluid?
Radiant heat will flow from hot objects to cooler objects Q = K (Thot^4-Tcool^4) conductive will be proportional to K deltaT.
You have to define this part as Named selection.
And only for this selection applied uniform heat flux.
Best regards
Named surfaces should not overlap by default. I divide the surface into characteristic parts that do not overlap. The boundary conditions are defined for each named surface. The advantage is that the average values of each physical variables can be obtained for each characteristic part of the surface.
Thank you for your answer. I was just modelling hypothetically. The application was a PCB with concentrated heat source. I modeled it using named selection and successfully applied boundary conditions. I appreciate your answers and I really learned a lot. I apologize for the late reply.
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