Unformatted text preview: system at 150 m3/h. Estimate the pressure drop per meter.
D = 6 cm
d = 2 cm P6.94
P6.95 Modify Prob. 6.94 as follows. Let the seven 2cm tubes be
solid rods, so that the air can only pass through the curved
triangular cusped passages. Compute the pressure drop per
meter of duct length.
P6.96 Hydrogen, at 20°C and approximately 1 atm, is to be
pumped through a smooth rectangular duct 85 m long of
aspect ratio 5:1. If the flow rate is 0.7 m3/s and the pressure drop is 80 Pa, what should the width and height of
the duct cross section be?
P6.97 A wind tunnel has a wooden rectangular section 45 cm by
95 cm by 26 m long. It uses sealevel standard air at 31m/s average velocity. Estimate the pressure drop and the
power required if the fan efficiency is 75 percent.
P6.98 A rectangular heat exchanger is to be divided into smaller
sections using sheets of commercial steel 0.4 mm thick, as
sketched in Fig. P6.98. The flow rate is 20 kg/s of water
at 20°C. Basic dimensions are L 1 m, W 20 cm, and
H 10 cm. What is the proper number of square se...
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 Spring '08
 Sakar
 Fluid Dynamics, eText Main Menu, Osborne Reynolds

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