Question

Hydraulic oil is flowing through a 80 mm diameter horizontal pipe with a flow rate of 1.5 litres per -3 second. At a certain point the diameter changes to 5 cm. Assume the oil’s density is 870 kg.m . (a) Calculate the velocity in SI units through the wider diameter section of the pipe. (b) Calculate the velocity in SI units through the narrower section of the pipe. (c) What is the pressure difference between the larger and smaller sections of the pipe in Pa? A sphere of steel is heated in a furnace until it reaches a temperature of 500 °C. It is left to cool in the air at 25 °C. (d) Assuming emissivity values of 1, calculate the net heat flux from the sphere. (e) Calculate the peak wavelength of radiation from the sphere (in μm).

Answer #1

Oil is flowing through a horizontal pipe
constriction. In the large section, the pipe has a diameter of 1.7
meters and a pressure of 500 kPa. If the pipe constricts to a
diameter of 0.5 meters, what is the pressure in the constricted
pipe section. (Assume the oil flow rate is 65 m3/min
and oil density is 900 kg/m3)
49,432.419 kPa
13.096115 kPa
486.403885 kPa
513.801133 kPa
2. Oil is flowing through a
horizontal pipe expansion. In the small section,...

Oil is flowing through a horizontal pipe constriction. In the
large section, the pipe has a diameter of 1.9 meters and a pressure
of 900 kPa. If the pipe constricts to a diameter of 0.4 meters,
what is the pressure in the constricted pipe section. (Assume the
oil flow rate is 65 m3/min and oil density is 900 kg/m3) 933.509601
kPa 121,028.169 kPa 32.478208 kPa 866.621792 kPa

Water is flowing at the rate of 1.676 m/s in a 3.068 inches’
diameter horizontal pipe at a pressure p1 of 68.9 kPa. It then
passes to a pipe having an inside diameter of 2.067 inch. The
density of the water is 998 kg/m3 . a) Calculate the new pressure
p2 in the 2.067inch pipe. Assume no friction losses b) If
the piping is vertical and the flow is upward, calculate the new
pressure p2. The pressure tap for p2...

A 12 meter long and 12 mm inner diameter smooth pipe is used to
heat a liquid in an industrial process. The liquid enters the pipe
at a temperature of 25o C and a mean velocity of 0.80 m/s. A
uniform heat flux is maintained by an electric resistance heater
wrapped around the outer surface of the pipe so that the fluid
exits at 75o C. The fluid average properties are ? = 1000 kg/m3 ,
Cp = 4000 J/kg·K,...

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