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gmoehl August 17, 2012 04:55

Problem with Field Function
 
Hallo,

I've got a coolingtube through which an air stream flows. This air stream is heated by an heat flux over the surface of the tube.
The problem is that I don't know the temperature of the incoming and the outgoing air. I' only given the masflowrate of the air and the middle temperature of the air calculated by the equation:

Tm=(Tout+Tin)/2

I've chosen a Mass Flow Inlet as boundary-type for the Inlet. Of course the program demands the Inlet Temperature. So I wondered wether it is possible to write a Field Function for the Inlet that gets the outlet Temperature and then iterates the Inlet Temperature?
The Formula is not difficult but how do I get the temperature from a different Boundary?

Thank you all in advance for your help,

Claas

rwryne August 17, 2012 08:38

Quote:

Originally Posted by gmoehl (Post 377466)
Hallo,

I've got a coolingtube through which an air stream flows. This air stream is heated by an heat flux over the surface of the tube.
The problem is that I don't know the temperature of the incoming and the outgoing air. I' only given the masflowrate of the air and the middle temperature of the air calculated by the equation:

Tm=(Tout+Tin)/2

I've chosen a Mass Flow Inlet as boundary-type for the Inlet. Of course the program demands the Inlet Temperature. So I wondered wether it is possible to write a Field Function for the Inlet that gets the outlet Temperature and then iterates the Inlet Temperature?
The Formula is not difficult but how do I get the temperature from a different Boundary?

Thank you all in advance for your help,

Claas

Use a report. Set up a report to get the (avg, min, or max, whichever you want) temperature on your outlet. You can then reference it in a field function by using $<ReportName>Report. I.e. if you report is "Outlet Temperature" you can reference this in a field function using $OutletTemperatureReport

gmoehl August 18, 2012 04:17

Thank you very much for your help rwryne.
It's working


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