Treatment of solid - fluid interaction in Conjugate heat transfer

PratikJ · June 16, 2023, 02:43

Dear all,

I have some doubt regarding the setting the boundary conditions in case of conjugate heat transfer.
Let me brief the physics involved : 1 internal fluid (fluid1) with inlet and outlet, 2 solid layers(solid1, solid2) surrounding fluid1 in layered manner, fluid2 surrounding solid2 with inlet and outlet, solid3 surrounding fluid2, fluid2 again surrounding solid3.

So now, in this case, what should be the boundary conditions at the interface of, i. e. interface between fluid1 - solid1, solid1 - solid2, solid2 - fluid2, fluid2 - solid3, solid3 - fluid2.

Considering I want the conduction in solids too.... should interfaces need to be consider as 'internal' or 'wall' boundary condition ? and how to patch those interface ?

MKuhn · June 28, 2023, 06:40

An internal boundary condition you have only between two fluids zones or two solid zones. You need a coupled wall boundary, so that you have a wall connected to the fluid zone and a wall-shadow connected to the solid zone. In this case you have a heat flow form solid and fluid and vice versa.

June 16, 2023, 02:43	Treatment of solid - fluid interaction in Conjugate heat transfer	#1
PratikJ New Member Zoro_07 Join Date: Oct 2021 Posts: 3 Rep Power: 5	Dear all, I have some doubt regarding the setting the boundary conditions in case of conjugate heat transfer. Let me brief the physics involved : 1 internal fluid (fluid1) with inlet and outlet, 2 solid layers(solid1, solid2) surrounding fluid1 in layered manner, fluid2 surrounding solid2 with inlet and outlet, solid3 surrounding fluid2, fluid2 again surrounding solid3. So now, in this case, what should be the boundary conditions at the interface of, i. e. interface between fluid1 - solid1, solid1 - solid2, solid2 - fluid2, fluid2 - solid3, solid3 - fluid2. Considering I want the conduction in solids too.... should interfaces need to be consider as 'internal' or 'wall' boundary condition ? and how to patch those interface ?

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June 28, 2023, 06:40		#2
MKuhn Senior Member Moritz Kuhn Join Date: Apr 2010 Location: Germany, Dresden Posts: 218 Rep Power: 17	An internal boundary condition you have only between two fluids zones or two solid zones. You need a coupled wall boundary, so that you have a wall connected to the fluid zone and a wall-shadow connected to the solid zone. In this case you have a heat flow form solid and fluid and vice versa.