Free Stream Temperature in natural convection problem

tomcatbobby · January 25, 2011, 18:02

Hi

I've seen quite a few posts asking this questions with regards to modelling natural convection?

By the definition of free stream temperature that I understand-surely it is always changing and cannot be considered constant for modelling natural convection?

Thanks

ComputerGuy · January 26, 2011, 23:48

When you're modeling natural convection, you won't specify the boundary condition at the solid/fluid interface -- it's coupled heat transfer. The free-stream temperature you're citing is associated with a forced convection boundary condition.

Regards,
ComputerGuy

tomcatbobby · January 27, 2011, 06:41

I dont understand how I would set this up then. At the moment, I have two BC's. One for the wall's which is a convection coefficient and I this is where I thought I would need to to put the free stream temperature. The other BC is for the heater which is set at a fixed temperature.

Thanks

January 25, 2011, 18:02	Free Stream Temperature in natural convection problem	#1
tomcatbobby New Member Bobby Join Date: Dec 2010 Posts: 21 Rep Power: 15	Hi I've seen quite a few posts asking this questions with regards to modelling natural convection? By the definition of free stream temperature that I understand-surely it is always changing and cannot be considered constant for modelling natural convection? Thanks

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January 26, 2011, 23:48		#2
ComputerGuy Senior Member Real Name :) Join Date: Jan 2010 Location: United States Posts: 192 Rep Power: 16	When you're modeling natural convection, you won't specify the boundary condition at the solid/fluid interface -- it's coupled heat transfer. The free-stream temperature you're citing is associated with a forced convection boundary condition. Regards, ComputerGuy

January 27, 2011, 06:41		#3
tomcatbobby New Member Bobby Join Date: Dec 2010 Posts: 21 Rep Power: 15	I dont understand how I would set this up then. At the moment, I have two BC's. One for the wall's which is a convection coefficient and I this is where I thought I would need to to put the free stream temperature. The other BC is for the heater which is set at a fixed temperature. Thanks