Question

Used engine oil flows at 0.025 m/s through a 12.5-mm-diameter tube. The oil enters the tube at a temperature of 27 ºC, while the tube surface temperature is maintained at 87º C. Determine the oil outlet temperature for a 100-m and the total heat transfer.

Answer #1

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A 10-mm diameter tube has a maintained surface temperature of
200°C. Engine oil enters the tube at 70°C at a flow rate of 0.5
kg/s and exits at 105°C. Find the length, in m, of the tube and
well as the corresponding heat transfer rate, in W. Assume fully
developed flow and use the Dittus–Boelter equation to calculate the
average Nusselt number.
q = . L =

Pressurized Water is heated in a thin tube with a diameter of 60
mm. water enters with a mass flow rate of 0.01 kg/s and an inlet
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outlet, what is the surface temperature of the tube at the
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A 1 to 2 baffled shell-and-tube type heat exchanger is
used as an
engine oil cooler. Cooling water flows through tubes at 25 °C at
a
rate of 8.16 kg/s and exits at 35 °C. The inlet and outlet
temperatures of the engine oil are 65 and 55 °C, respectively.
The
heat exchanger has 12.25-in. I.D. shell, and 18 BWG and
0.75-in.
O.D. tubes. A total of 160 tubes are laid out on a 15/16-in.
triangular
pitch. By assuming Ro...

Mercury at an inlet temperature of 75 °C flows through a 2 cm
inside diameter tube at a flow rate of 1.5 kg/s. This tube is part
of a nuclear reactor in which heat can be generated uniformly at
any desired rate by adjusting the neutron flux level. Determine
convection heat transfer coefficient, and the heat flux required
for a 1.5 m length of tube required to raise the temperature of the
mercury to 275 °C. Also determine if mercury...

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?

Kerosene enters a 5 cm diameter tube at 35C with a velocity of
3 m/s. The tube is wrapped with a resistance heating element so
that when it is energized a uniform heat flux is imposed on the
tube. At the exit of the tube, the temperature of the kerosene is
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Blood flows at 0.0065 kg/s through an artery of diameter 8 mm
and length 350 mm. It enters the artery at 36.5°C and leaves it at
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mean heat flux through the artery wall, and the mean velocity of
the blood. (Note: the thermophyhsical properties of blood may be
approximated by properties of liquid water at 37°C.)

Combustion gases passing through a 2.3-cm-internal diameter
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An aluminum fin 1.6 mm thick surrounds a tube 2.5 cm
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Consider the heat dissipated in a pipe 1.20 m long if the fins are
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(a) Fluid at a mass flow rate of 0.352 kg/s flows through a tube
with a diameter of 15 mm and a length of 25 m. The inner surface of
the tube is heated with a uniform heat flux of 1000 W/m2.
Measurements shown that the inlet temperature of the fluid is 30
˚C. Assume the outer surface of the tube is perfectly insulated.
Consider the thermophysical properties of the fluid are as follows:
density ρ = 1000 kg/m3, specific...

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