Question

Water at 110^{o}F flows at 8 ft/s across a long cylinder
with a diameter if 1.75 inches. If the surface temperature of the
cylinder is 200^{o}F, what is the convective heat transfer
from the cylinder per unit length?

subject: heat transfer

Answer #1

This problem belongs to force convection.Please go through images given below for step by step answer of your problem,

**NOTE:** Your answer can vary depending on assumed
properties of water, as properties of water at given temperature
are not given in question.

Hot water enters a counter-flow double-pipe heat exchanger at
180F with a velocity of 5 ft/s. Cold water at 80F flows at 3 ft/s
in the outer section of the exchanger. The diameter of the inner
pipe is 1 inch, the pipe wall thickness is 1/8", and the outer pipe
diameter is 2 inches. The overall heat transfer coefficient times
area per unit length UA/L = 150 Btu/hr-ft-F. If the exchanger is 16
feet long, what is the exit temperature...

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/m2K?

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
temperature of 27 C, giving a convective heat transfer coefficient
of 380 W/m2-K.
a) Determine the surface and centerline temperatures of the
cylinder 12 minutes after immersion.
b) Calculate the heat transferred from the cylinder during this...

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

EX/8.28
Air flows across a 4 cm square cylinder with a velocity of 10
m/s. The air is at 25°C while the
surface is at 75°C. Determine the heat transfer rate if (i) flow is
along the diagonal (ii) flow is
along face (or perpendicular to face).

A long 8-cm-diameter steam pipe whose external surface
temperature is 90°C passes through some open area that is not
protected against the winds. Determine the rate of heat loss from
the pipe per unit of its length when the air is at 1 atm pressure
and 7°C and the wind is blowing across the pipe at a velocity of 47
km/h. The properties of air at 1 atm and the film temperature of
(Ts + T∞)/2 = (90 + 7)/2...

Liquid water at velocity of 2 m/s and temperature of
15 °C flows over a flat plate. The plate has a width of 1 m, length
of 0.4 m and surface temperature of 37 °C.
Determine:
(a) the average heat transfer coefficient.
(b) the convection heat transfer rate from the top surfacc of the
platc.

A certain combustion engine is air-cooled and has a cylinder
constructed of cast iron (k = 35 Btu/h ft °F). The fins on the
cylinder have a length of 5/8 in and thickness of 1/8 in. The
convection coefficient is 15 Btu/h ft °F. The cylinder diameter is
4 in. Calculate the heat loss per fin for a base temperature of
100°F. Now you have two options to improve the heat transfer, first
to increase the length of the fins...

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
34.0°C. Calculate the rate of heat transfer from the blood, the
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.)

Estimate the convective heat transfer coefficient on the outside
of oranges (external diameter= 5cm) when submerged in a stream of
chilled water pumped around the orange. The velocity of water
around an orange is 0.1 m/s. The surface temperature is 20 C and
the bulk water temperature is 0 C.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 8 minutes ago

asked 13 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago