Fluid Mechanics Fundamentals And Applications
3rd Edition
ISBN: 9780073380322
Author: Yunus Cengel, John Cimbala
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 6, Problem 101P
Consider water flow through a horizontal, short garden hose at a rate of 30 kg mm. The velocity at the inlet is 1.5 ms and that at the outlet is 14.5 ms. Disregard the weight of the hose and water. Taking the momentum-flux correction factor to be 1.04 at both the mulct and the outlet, the anchoring force required to hold the hose in place is
(a) 2.8N
(b) 8.6 N
(c) 17.5 N
(d) 27.9N
(c) 43.3N
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(b) A 90° elbow in a horizontal pipe is used to direct water flow upward at a rate of 40 kg/s,
as shown in the Figure 2. The diameter of the entire elbow is 10 cm. The elbow discharges
water into the atmosphere, and thus the pressure at the exit is the local atmospheric
pressure. The elevation difference between the centres of the exit and the inlet of the elbow
is 50 cm. The weight of the elbow and the water in it is considered to be negligible.
i)
Draw an appropriate control volume for the flow and state all your assumptions
clearly.
ii)
Determine the gage pressure at the centre of the inlet of the elbow
iii)
Determine the anchoring force needed to hold the elbow in place
50 cm
Water
40 kg/s
Figure 2
Consider water flow through a horizontal, short garden hose at a rate of 0.5 kg/s. The velocity at the inlet is 1.5 m/s and that at the outlet is 11.5 m/s. The hose makes a 180° turn before the water is discharged. Disregard the weight of the hose and water. Taking the momentum-flux correction factor to be 1.04 at both the inlet and the outlet, the anchoring force required to hold the hose in place is:
A pump increases the pressure of water from 100 kPa to 1.2 MPa at a rate of 0.5 m3 /min. The inlet and outlet diameters are identical and there is no change in elevation across the pump. If the efficiency of the pump is 77 percent, the power supplied to the pump is (a) 11.9 kW (b) 12.6 kW (c) 13.3 kW (d ) 14.1 kW (e) 15.5 kW
Chapter 6 Solutions
Fluid Mechanics Fundamentals And Applications
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