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Forum: CFX

November 4, 2010, 14:53

Replies: 7

Petukhov, Gnielinski HTC

Views: 5,036

Posted By EJH

I originally had the model as three domains: two...

I originally had the model as three domains: two solids (one heated pipe and one unheated pipe), and one fluid (water). The heated pipe had a constant heat flux boundary condition at its OD. I saw...

Forum: CFX

November 4, 2010, 12:34

Replies: 7

Petukhov, Gnielinski HTC

Views: 5,036

Posted By EJH

Nu = h*dia./k q" = h(Twall - Tmean) q"...

Nu = h*dia./k
q" = h(Twall - Tmean)

q" and the pipe diameter are constant input values. k is a constant material property.

Twall I get from a line generated at the wall, and Tmean comes from...

Forum: CFX

November 2, 2010, 11:50

Replies: 7

Petukhov, Gnielinski HTC

Views: 5,036

Posted By EJH

Unfortunately, I can't use the near-wall temp,...

Unfortunately, I can't use the near-wall temp, nor a constant value for 'tbulk'. It needs to be a velocity-averaged temperature (since water is incompressible, I can use mass-averaged temp.). ...

Forum: CFX

November 2, 2010, 09:40

Replies: 7

Petukhov, Gnielinski HTC

Views: 5,036

Posted By EJH

Petukhov, Gnielinski HTC

I have a "simple" simulation that's driving me nuts. I'm trying to prove the accuracy of the Petukhov-Gnielinski heat transfer coefficient correlation for thermal-entry length in a pipe (see...

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