Can fluent predict temperature in Entrance region(Tube)
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Dear all
I am studying a laminar flow in tube with constant wall heat flux. I compute heat transfer coefficient(htc) with this step: 1)in xy plot i write wall temperature. 2)i opened the file with excel and compute bulk temperature and heat transfer coefficient with this equation.(attached file) 3)in excel i compute h with: h=q/(T(w)-T(b) with this way i compute htc.is it right to do that? when i cheked my result(i mean htc) with article(experimental) in Entrance region it has 40%error!!!!, but when flow become developed thermally and hydrodynamic it has 1% error. is any body has encountered with this problem before? How can i get true answer in Entrance region? Can fluent predict wall temperature in Entrance region? by the way i got mesh converged(156000node). Thanks |
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