Unformatted text preview: C. Compute the sublayer thickness in inches
and the pumping horsepower required at 75 percent efficiency if L 40 ft.
P6.52 The pipe flow in Fig. P6.52 is driven by pressurized air in
the tank. What gage pressure p1 is needed to provide a
20°C water flow rate Q 60 m3/h?
*P6.53 In Fig. P6.52 suppose P1 700 kPa and the fluid specific
gravity is 0.68. If the flow rate is 27 m3/h, estimate the
viscosity of the fluid. What fluid in Table A.5 is the likely
suspect?  eText Main Menu  P6.55
P6.56 Consider a horizontal 4ftdiameter galvanizediron pipe
simulating the Alaskan pipeline. The oil flow is 70 million
U.S. gallons per day, at a density of 910 kg/m3 and viscosity of 0.01 kg/(m s) (see Fig. A.1 for SAE 30 oil at
100°C). Each pump along the line raises the oil pressure
to 8 MPa, which then drops, due to head loss, to 400kPa
at the entrance to the next pump. Estimate (a) the appropriate distance between pumping stations and (b) the power
required if the pumps are 88 percent efficient...
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 Spring '08
 Sakar
 Fluid Dynamics, eText Main Menu, Osborne Reynolds

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