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Old   January 10, 2011, 12:36
Default Pipe Flow
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I am solving a problem for pipe flow i know inlet flow conditions such as:
mass flow rate
This flow has temp almost 700K so there is some insulation on pipe ad after some numerical calculation i found Tsurf for pipe is 477K.

Now i am giving boundary consition in CFX to find exit flow conditions.

1. At inlet i put T,P and I dont know any exit condition so i took mdot(in) = mdot(out) is it ok?

2. Secondly i dont know how to treat that wall can i impose Twall 477K? it will work? or otherwise what should i have to put.

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Old   January 10, 2011, 17:41
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Glenn Horrocks
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Sounds like you need to define a pressure inlet with T and P defined, and a mass flow rate outlet with the mass flow rate defined.

Your calculated wall temp will only apply at one location along the flow and will change as the flow temperature changes. Best to use a heat transfer coefficient boundary and let it work out the wall temperature as it goes along.
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