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Unformatted text preview: recovery.
P6.134 For Prob. 6.133 suppose we are limited by space to a total diffuser length of 30 ft. What should the diffuser angle,
exit height, and exit pressure be for maximum recovery? Textbook Table of Contents  Study Guide Problems 417
P6.135 A small airplane flying at 5000m altitude uses a pitot stagnation probe without static holes. The measured stagnation pressure is 56.5 kPa. Estimate the airplane’s speed in
mi/h and its uncertainty. Is a compressibility correction
needed?
P6.136 For the pitotstatic pressure arrangement of Fig. P6.136,
the manometer fluid is (colored) water at 20°C. Estimate
(a) the centerline velocity, (b) the pipe volume flow, and
(c) the (smooth) wall shear stress. 10 m Air 16 cm D = 6 cm P6.138
Air
8 cm 20°C ptotal 1 atm
h1 V 40 mm P6.136 h2 pstatic P6.137 For the 20°C water flow of Fig. P6.137, use the pitotstatic arrangement to estimate (a) the centerline velocity and
(b) the volume flow in the 5indiameter smooth pipe.
(c) What error in flow rate is caused by neglecting the
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 Spring '08
 Sakar

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