Unformatted text preview: of diameter, what are the minimum cost
and the pipe and pump size to maintain the 3 ft3/s flow
rate? Make some simplifying assumptions. 1 m3 L = 80 cm
D = 4 cm Q P6.63  v v P6.61 P6.65 In Prob. 6.63 the initial flow is turbulent. As the water
drains out of the tank, will the flow revert to laminar motion as the tank becomes nearly empty? If so, at what tank
depth? Estimate the time, in h, to drain the tank completely.
P6.66 Ethyl alcohol at 20°C flows through a 10cm horizontal
drawn tube 100 m long. The fully developed wall shear
stress is 14 Pa. Estimate (a) the pressure drop, (b) the volume flow rate, and (c) the velocity u at r 1 cm.
P6.67 What level h must be maintained in Fig. P6.67 to deliver
a flow rate of 0.015 ft3/s through the 1 in commercialsteel
2
pipe?  eText Main Menu  Textbook Table of Contents  Study Guide Problems 411
P6.72 The 5mlong pipe in Fig. P6.72 may be oriented at any
angle . If entrance losses are negligible for any (pure
Moody friction loss), what is the optimum value of for
which the jet height loss h is minimum?
∆h
Water
at 20°C
10 m cost of...
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 Spring '08
 Sakar
 Fluid Dynamics, eText Main Menu, Osborne Reynolds

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