Viscous Flow in Pipes.pdf
Viscous Flow in Pipes.pdf
Viscous Flow in Pipes.pdf
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Determ<strong>in</strong>ation of friction coefficient• In general with• Moody chart1 210% accuracy is best expected• Colebrook formulaV= Vl ρVp1− p2 = γ ( z2 − z1) + γhL= γ ( z2 − z1)+ f D 2Part of the pressure change is due to the elevationchange and part is due to the heat loss associated withfriction effects.1 ⎛εD 2.51=− 2.0 log+f ⎜⎝ 3.7 Re f⎞⎟⎠2
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