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Unformatted text preview: Const surf temp, T m fcn of dist Eqn 8.42 Const surf temp w/ overall U Eqn 8.45a C. Laminar Flow in Circular Tubes 1. Fully developed conditions Uniform heat flux Eqn 8.53 Constant surface temp Eqn 8.55 2. Entry Region Effect Local Nu D Fig 8.10 Avg Nu D , f.d. flow but thermal entry region Eqn 8.56 Avg Nu D , combined flow & thermal entry regions Eqn 8.57 D. Turbulent Flow in Circular Tubes 1. Fully developed: average and local are the same Dittus-Boelter Eqn 8.60 simple, small temp diff (n defin under eqn) Seider-Tate Eqn 8.61 simple, large temp diff Gnielinski Eqn 8.62 complex, wider range of Re, uses Moody f E. Non-Circular Tubes, fully developed laminar flow Hydraulic diameter Eqn 8.66 Nu D , uniform q Table 8.1 Nu D , T s constant Table 8.1 Moody f Table 8.1...
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- Spring '08
- Heat Transfer