# thermal boundary option

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 February 27, 2010, 06:12 thermal boundary option #1 New Member   liang liam Join Date: Nov 2009 Location: Taiwan Posts: 28 Rep Power: 7 hello everyone~ I have a problem about ...heat transfer coefficients that is from model setup/boundaries/mesh boundaries/mesh block/wall/thermal information/thermal boundary options there are heat transfer coefficient to fluid 1 &to fluid 2 ,does anybody know that means? thanks

 February 28, 2010, 20:52 #2 Senior Member   michael barkhudarov Join Date: Mar 2009 Posts: 331 Rep Power: 9 if the mesh boundary is of type 'wall' with a specified temperature, then it needs an htc between the wall and adjacent fluid to compute the heat flux at the boundary. The user can defined a different htc for fluid 1 and 2 in two-fluid problems. does it make sense?

 March 1, 2010, 00:55 #3 Senior Member   Join Date: Mar 2009 Posts: 129 Rep Power: 8 Michael i thought the heat transfer coefficient is calculated by the solver while solving the conjugate heat transfer problem? pls help to clarify.

 March 1, 2010, 12:23 #4 Senior Member   michael barkhudarov Join Date: Mar 2009 Posts: 331 Rep Power: 9 Yes, the solver will do it if you leave these input entries blank.

March 3, 2010, 11:07
#5
New Member

liang liam
Join Date: Nov 2009
Location: Taiwan
Posts: 28
Rep Power: 7
Quote:
 Originally Posted by MuxaB if the mesh boundary is of type 'wall' with a specified temperature, then it needs an htc between the wall and adjacent fluid to compute the heat flux at the boundary. The user can defined a different htc for fluid 1 and 2 in two-fluid problems. does it make sense?
but if I set the 'wall' as copper that have thermal conductivity value(k),does it needs a htc ?

 March 3, 2010, 19:27 #6 Senior Member   michael barkhudarov Join Date: Mar 2009 Posts: 331 Rep Power: 9 It does not really matter what material it is made of. The user can either define a constant htc at the fluid/wall interface, or the code will compute it automatically as a function of the materials properties and the flow. In the latter case, it assumes that the contact between copper and fluid is perfect, i.e., no thermal resistance.

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