Lecture 20 Forced Convection 1

Lecture 20 Forced Convection 1 - 1 MECE 4364 Heat Transfer...

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MECE 4364 Heat Transfer Prof. Dong Liu Department of Mechanical Engineering University of Houston 1 Lecture 20 – Oct 26, 2010 Lecture 20 Forced Convection 2
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Lecture 20 Review: External Flow ± As with all external flows , the boundary layers develop freely without constraint ± Boundary layer conditions may be entirely laminar, laminar and turbulent, or entirely turbulent 3 • To determine the conditions, compute and compare with the critical Reynolds number for transition to turbulence, Re L uL uL ρ μ ν ∞∞ == , Re . x c , Re Re laminar flow throughout Lx c <→ ,, Re Re transition to turbulent flow at / Re / Re L xc c L x L >→ Lecture 20 Review: External Flow ± Governing equations ± Similarity solutions ± Key results 4 2 2 uu u uv x yy ∂∂ += 2 2 TT T x α 32 20 df f dd ηη + = 2* * 2 Pr 0 2 dT f + = () 1/2 1/2 5.0 5 /R e x x x δ , 1/2 , 2 0.664Re /2 x sx fx C u τ ≡= 1/2 1/3 0.332 Re Pr x xx hx Nu k 1/3 Pr t = Note: The effect of variable properties may be considered by evaluating all properties at the film temperature .
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Lecture 20 Forced Convection 1 - 1 MECE 4364 Heat Transfer...

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