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CHAPTER 8. PIPE FLOW EXAMPLE 1CHAPTER 8. PIPE FLOW EXAMPLE 1
Problem 1. (Laminar flow) Asphalt at 120 F, considered to be a
Newtonian fluid with a viscosity 80,000 times that of water and aspecific gravity of 1.09, flows through a pipe of diameter 2.0 in. If
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the pipe is (a) horizontal; (b) vertical with flow up.
e ow s am nar, en e ow can e escr e y
Poiseuilles LAW (EQ 8.9).
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Horizontal FLOW
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ert ca
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ec um er or am nar
Use Maximum Flow Rate or HORIZONTAL FLOW
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CHAPTER 8. PIPE FLOW EXAMPLE 2CHAPTER 8. PIPE FLOW EXAMPLE 2
Problem 2 (Laminar flow) A fluid flows through two horizontal
pipes of equal length which are connected together to form a pipeof length 2l. The flow is laminar and fully developed. The
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the second pipe. If the diameter of the first pipe is D, determine
the diameter of the second pipe.
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CHAPTER 8. PIPE FLOW EXAMPLE 3CHAPTER 8. PIPE FLOW EXAMPLE 3
Problem 3. (Moody chart) Water flows in a smooth plastic pipe
of 200-mm diameter at a rate of 0.10 m3/s. Determine the friction
actor or t s ow.
200-mm
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CHAPTER 8. PIPE FLOW EXAMPLE 4CHAPTER 8. PIPE FLOW EXAMPLE 4
Problem 4. (Single pipedetermine pressure drop) A fire
protection association code requires a minimum pressure of 65 psiat the outlet end of a 250-ft-long, 4-in.-diameter hose when the
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the pumper truck that supplies water to the hose? Assume a
roughness of =0.03 in.
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CHAPTER 8. PIPE FLOW EXAMPLE 4CHAPTER 8. PIPE FLOW EXAMPLE 4
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CHAPTER 8. PIPE FLOW EXAMPLE 5CHAPTER 8. PIPE FLOW EXAMPLE 5
Problem 5. (Single pipedetermine pressure drop) An above
round swimmin ool of 30 ft diameter and 5 ft de th is to be
filled form a garden hose (smooth interior) of 100 ft length and5/8 inch diameter (ID). If the pressure at the faucet outlet to
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to fill the pool? The water exits the hose as a free jet 6 feet above
the faucet.
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CHAPTER 8. PIPE FLOW EXAMPLE 5CHAPTER 8. PIPE FLOW EXAMPLE 5
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CHAPTER 8. PIPE FLOW EXAMPLE 5CHAPTER 8. PIPE FLOW EXAMPLE 5
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CHAPTER 8. PIPE FLOW EXAMPLE 5CHAPTER 8. PIPE FLOW EXAMPLE 5
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CHAPTER 8. PIPE FLOW EXAMPLE 6CHAPTER 8. PIPE FLOW EXAMPLE 6
Problem 6. (Single pipe with pump) The pump shown in the
figure adds a 15-ft head to the water being pumped when the
flowrate is 1.5 ft3/s. Determine the friction factor for the pipe.
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CHAPTER 8. PIPE FLOW EXAMPLE 6CHAPTER 8. PIPE FLOW EXAMPLE 6
Determine the friction factor (f) for the pipe.
Assume DOWNWARD FLOWAssume DOWNWARD FLOW
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CHAPTER 8. PIPE FLOW EXAMPLE 6CHAPTER 8. PIPE FLOW EXAMPLE 6
Determine the friction factor (f) for the pipe.
Assume DOWNWARD FLOWAssume DOWNWARD FLOW
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CHAPTER 8. PIPE FLOW EXAMPLE 6CHAPTER 8. PIPE FLOW EXAMPLE 6
Determine the friction factor (f) for the pipe.
hp = 15 ft
Q = 1.5 ft3/sV
(2)ssumessume
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SOLVE this one.
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CHAPTER 8. PIPE FLOW EXAMPLE 7CHAPTER 8. PIPE FLOW EXAMPLE 7
Problem 7. Water drains from a pressurized tank through a pipe
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If entrance effects are negligible, determine the flow rate.
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CHAPTER 8. PIPE FLOW EXAMPLE 7CHAPTER 8. PIPE FLOW EXAMPLE 7
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CHAPTER 8. PIPE FLOW EXAMPLE 7CHAPTER 8. PIPE FLOW EXAMPLE 7