Question

Liquid water flows in a long pipe of internal diameter of
*D* = 0.01 m at a mean velocity of *V =* 0.065 m/s.
The pipe is maintained at a constant and uniform surface
temperature. Assume the flow is both hydrodynamically and thermally
fully developed. For simplicity, evaluate the properties of water
at 300 K.

Calculate the convective heat transfer coefficient of the flow
inside the pipe in W/m^{2}K?

Answer #1

ACCORDING TO THE DATA GIVEN IN THE QUESTION,

A 2.5 cm inside diameter pipe is being used to convey a liquid
food at 80ºC. The inside convective heat transfer coefficient is
10W/(m2ºC). The pipe (0.5 cm thick) is made of steel (thermal
conductivity = 43W/mºC). The outside ambient temperature is 20ºC.
The outside convective heat-transfer coefficient is 100 /(m2ºC).
Calculate the overall heat transfer coefficient and the heat loss
from 1 m length of the pipe.

A 12 meter long and 12 mm inner diameter smooth pipe is used to
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A pipe is transporting saturated steam at 1 bar (100°C)
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The pipe is mild steel with a thermal conductivity of 80 W m-1 K-1.
Covering the pipe is a 20 mm thick layer of polythene insulation
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Consider an internal flow through a circular tube. Assuming
hydrodynamically fully developed condition, the velocity profile is
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heat flux case,
a) Calculate NuD for thermally fully developed condition.
b) Also, plot variations of tube surface temperature and mean
fluid temperature along flow direction (x) including entry and
fully developed region.
c) Can you plot variation of convective heat transfer
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Water flows through a pipe at an average temperature of
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r1 = 6 cm and r2 = 6.5 cm,
respectively. The outer surface of the pipe is wrapped with a thin
electric heater that consumes 300 W per m length of the pipe. The
exposed surface of the heater is heavily insulated so that the
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Heat is transferred...

A long cylinder 11 cm in diameter is initially at a uniform
temperature of 427 C and has a density of 7250 kg/m3, thermal
conductivity of 16.7 W/m-K, and a specific heat of 540
J/kg-K. The cylinder is suddenly plunged into water with a
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a) Determine the surface and centerline temperatures of the
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b) Calculate the heat transferred from the cylinder during this...

Liquid, pumped through the inside of the pipe, is at a
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coefficient hi = 450 W/m2-K at the inner
surface of the pipe. The inside and outside radii of the pipe are
r1 = 0.25 m, r2 = 0.31 m. The thermal conductivity of the pipe is
240 W/m-K. The outside radius of the insulation, r3 = 0.35 m. The
thermal conductivity of the insulation is 20 W/m-K. The outside
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A 1.5cm inside diameter tube has water flowing in it at a flow
rate such that the Reynolds number is 50,000. The water enters the
tube at 10oC and the tube wall temperature is maintained
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Calculate:
a) the amount of heat transfer required to achieve a
10oC increase in water temperature (in W)
b) the length of the tube to achieve this amount of heat
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The condenser of a large steam power plant is a heat exchanger
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Liquid water at velocity of 2 m/s and temperature of
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Determine:
(a) the average heat transfer coefficient.
(b) the convection heat transfer rate from the top surfacc of the
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