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Unformatted text preview: cm P6.36 P6.37 P6.40 | e-Text Main Menu | surements shown, determine (a) whether the flow is up or
down and (b) the flow rate in m3/h.
In Prob. 6.40 suppose it is desired to add a pump between
A and B to drive the oil upward from A to B at a rate of
3 kg/s. At 100 percent efficiency, what pump power is required?
It is clear by comparing Figs. 6.12b and 6.13 that the effects of sand roughness and commercial (manufactured)
roughness are not quite the same. Take the special case of
commercial roughness ratio /d 0.001 in Fig. 6.13, and
replot in the form of the wall-law shift B (Fig. 6.12a)
versus the logarithm of
u*/ . Compare your plot
with Eq. (6.61).
Water at 20°C flows for 1 mi through a 3-in-diameter horizontal wrought-iron pipe at 250 gal/min. Estimate the
head loss and the pressure drop in this length of pipe.
Mercury at 20°C flows through 4 m of 7-mm-diameter
glass tubing at an average velocity of 5 m/s. Estimate the
head loss in m and the pressure drop in kPa.
Oil, SG 0.88 and
4 E-5 m2...
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- Spring '08