The drag of an airfoil at zero angle of attack is a function of density, viscosity, and velocity, in addition to a length parameter



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Example

Water flows in a pipe 2 cm in diameter and 30 m long; the pipe is running full. Find the head loss when the temperature is 5C and the velocity is 10 cm/s.


(see Fig. A.3, p. 764, Text)
flow is laminar

head loss: of water
of water
Oil at 60F has a specific gravity of 0.92 and kinematic viscosity of 0.0205 ft2/s. Find the horsepower required to pump 50 tons of oil per hour along a pipeline 9 in diameter and one mile long.



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