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Unformatted text preview: ry layer normally occurs at Rex
2.8 106, where x is the distance from the leading edge [2,
3]. If the wing is moving at 20 m/s, at what point on the
wing will transition occur at 20°C for (a) air and (b) water?
If the wing of Prob. 6.2 is tested in a wind or water tunnel, it may undergo transition earlier than Rex 2.8 106
if the test stream itself contains turbulent fluctuations. A
semiempirical correlation for this case [3, p. 383] is
xcrit (1 13.25 2)1/2
0.00392 2 where is the tunnel-turbulence intensity in percent. If V
20 m/s in air at 20°C, use this formula to plot the transition position on the wing versus stream turbulence for
between 0 and 2 percent. At what value of is xcrit decreased 50 percent from its value at
0? | v v P6.1 | e-Text Main Menu | D U P6.5
P6.6 P6.7 P6.8 P6.9 x, m
p, kPa A fluid at 20°C flows at 850 cm3/s through an 8-cm-diameter pipe. Determine whether the flow is laminar or turbulent if the fluid is (a) hydrogen, (b) air, (c) gasoline,
(d) water, (e...
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- Spring '08