# calculation of heat transfer coefficient for bank of cylinders

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 May 30, 2014, 04:10 calculation of heat transfer coefficient for bank of cylinders #1 New Member   sid Join Date: May 2014 Posts: 5 Rep Power: 3 hi guys I am new at using ansys and the problem i have in hand is to find the cooling time for a array of cylinderical wires from 80degree celius to 50 degree celius the conditions are laminar cross flow over the cylinder forced convection I somehow managed to get the empirical fomulation of convective heat coefficient for a single wire using empirical corelations but what should i do find the h for a in line configuration of cylinderical wires I read that it can be done using CFX ansys but i am unable to do it I know that the h will vary as the air flows over the cylinders in one row Please help an early response will be appreciated Please if anyone has any idea kindly do share I am in deep trouble and not getting any help

 May 30, 2014, 06:55 transient analysis #2 Senior Member     Marcin Join Date: May 2014 Location: Poland, Swiebodzin Posts: 128 Rep Power: 3 Hey, You can use CFX and transient analysis with initialization tmeperature on solid domain. You dont need to use heat transfer coefficient, program will obtain automatically sidrameshrath likes this.

 May 30, 2014, 10:21 #3 New Member   sid Join Date: May 2014 Posts: 5 Rep Power: 3 thanks but can u in brief tell me how to do it

May 31, 2014, 06:43
#4
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Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 128
Rep Power: 3
Quote:
 Originally Posted by sidrameshrath thanks but can u in brief tell me how to do it
On the tree you click on analysis type and choose transient, when you make this
you must obtain your simulation time . in the first phase you can choose 10 s ( when your model is not complicated - no a lot of finite elements). The next step is to define bc and interface model.
You must chase surfaces contact on the interface model and make heat transport on there. On the temperature transfer coefficent make none. CFX obtai this automatically. On post You can measure this temperature transport coefficent. Sorry for my english
Best regards

 June 2, 2014, 01:15 #5 New Member   sid Join Date: May 2014 Posts: 5 Rep Power: 3 whats is interface model is it the geometry of the object ??? which part needs to be done in cfx and which part in transient thermal???

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