Question

Air at 85 °F flows isothermally through a 6 in diameter smooth pipe at a flow rate of 10 lbm/s. If the pressure at one section is 70 psia, determine the pressure at a section 600 ft downstream from the first section. Give your final answer in psia. Answer should be 59.7 psia

Answer #1

Air is heated as it flows through a constant diameter
tube. The air enters the tube at 50 psia and 80 F with an average
velocity of 10 ft/s at the entrance. The air leaves at 45 psia and
255 F.
a) Sketch the control volume
b) Determine the average velocity of the air (ft/s) at the
exit
c) If 23 lbm/min of air is to be heated, what diameter (in.) tube
is required?

Gasoline at T = 68∘F flows through an 8-in.-diameter smooth pipe
at the rate of 4.15 ft3/s. Use the equation
1f√=−1.8log[(ε/D3.7)1.11+6.9Re], where ε = 0 ft.
Determine the head loss in a 20-ft-long segment of the pipe

compressible flow:
A subsonic flow of air passes through a pipe of 2.5-cm diameter
which is choked at the exit. At the pipe inlet, the stagnation
pressure is 700 kPa and the stagnation temperature is 330 K. If f¯
= 0.022 and the pipe length is 12 m, what will be the mass flow
rate through the pipe, in kg/sec?

Air at 373°C and 121 kPa flows through a horizontal 7 cm
diameter pipe at a speed of 50 m/s. If the air changes temperature
to 375°C at a constant pressure, what is the value of the change in
the flow of kinetic energy? Write your result in J/s.

Water (70°F) flows with a speed of 4 ft/s through a horizontal
run of PVC pipe. The length of the pipe is 200 ft, and the pipe is
schedule 40 with a nominal diameter of 3.5 inches. Calculate the
resistance coefficient, f

Air flows into a pipe at a volume flow rate of
0.5m3/s and a speed of 1.0m/s. The temperature is
tripled during the passage through the pipe and the pressure is
doubled. What is the volume flow rate at the exit in standard SI
units? [SHOW WORKING ]

Water is supplied to a business in a 1.063-inch diameter copper
pipe at 5 ft/s. Friction factor f = 0.025 for this pipe.
a. Find the pressure drop over 100 ft of this pipe. [Answer: 5
psia, which is significant considering that the water supply is
usually about 50 psig. Bends in the pipe and other pipe fittings
reduce the water pressure even more, of course.]
b. What is the volumetric flow rate of water gpm?

Air enters the evaporator section of a window air conditioner at
14.7 psia and 90°F with a volume flow rate of 200 ft3 /min.
Refrigerant-134a at 20 psia with a quality of 30 percent enters the
evaporator at a rate of 4 lbm/min and leaves as saturated vapor at
the same pressure. Determine (a) the exit temperature of the air
and (b) the rate of heat transfer from the air.

SAE 30 Oil at 60oF flows through a 1.5 m diameter
pipe at a velocity of 2.5 m/s.
(3 points) What type of flow is occurring in the
pipe:
(2 points) If the pipe is made out of cast iron,
determine the friction factor for flow through this
pipe.

(Laminar flow) Asphalt at 120°F, considered to be a Newtonian
fluid with a viscosity 88,000 times that of water and a specific
gravity of 1.60, flows through a pipe of diameter 2.00 in. If the
pressure gradient is 1.64 psi/ft, determine the flowrate assuming
the pipe is (a) horizontal (ft3/s) (b) vertical with flow up
(ft3/s)

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