Boundary conditions for enabling heat transfer

dre028 · February 21, 2014, 19:20

Hi there,

I am building a simple model that will allow me to apply heat to the outer surface of a roughened aluminium duct and cool it using an air flow inside. I have built a planar model within Design Modeler, made up of 2 surface bodies, meshed separately in ANSYS Meshing but now I cannot figure out what boundary condition to apply in fluent. The heat flux is being applied using a wall boundary condition at the outer side, but applying a wall boundary condition on the inner side doesn't seem right. I want ANSYS to conduct the heat to the roughened surface and then transfer it to the fluid, and applying 0 heat flux would mean insulating it - the exact opposite of what I want. I have 2 interior zones (aluminium and air) and 2 boundary zones (outer and inner surface of aluminium). What is best to use, please?

Thanks!

vallarasu · February 22, 2014, 04:52

If u know the temperature of the flowing fluid and outside temperature means u can apply that.. Instead of heatflux

dreamz · March 30, 2014, 00:09

Try putting convective boundary condition on the surface which is open to the fluid. You will require to estimate the convective heat transfer co-efficient for the same

February 21, 2014, 19:20	Boundary conditions for enabling heat transfer	#1
dre028 New Member Andre Caruana Join Date: Feb 2014 Location: Malta Posts: 3 Rep Power: 12	Hi there, I am building a simple model that will allow me to apply heat to the outer surface of a roughened aluminium duct and cool it using an air flow inside. I have built a planar model within Design Modeler, made up of 2 surface bodies, meshed separately in ANSYS Meshing but now I cannot figure out what boundary condition to apply in fluent. The heat flux is being applied using a wall boundary condition at the outer side, but applying a wall boundary condition on the inner side doesn't seem right. I want ANSYS to conduct the heat to the roughened surface and then transfer it to the fluid, and applying 0 heat flux would mean insulating it - the exact opposite of what I want. I have 2 interior zones (aluminium and air) and 2 boundary zones (outer and inner surface of aluminium). What is best to use, please? Thanks!

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February 22, 2014, 04:52		#2
vallarasu New Member ok Join Date: Dec 2013 Posts: 9 Rep Power: 12	If u know the temperature of the flowing fluid and outside temperature means u can apply that.. Instead of heatflux

March 30, 2014, 00:09		#3
dreamz Member Ashutosh Join Date: Jul 2013 Posts: 98 Rep Power: 12	Try putting convective boundary condition on the surface which is open to the fluid. You will require to estimate the convective heat transfer co-efficient for the same