Question

Carbon dioxide at 90 C and atmospheric pressure flows over a square horizontal plate at 60 m/s. The side lengths are 60 cm, and the plate is maintained at a constant uniform temperature of 10 C. (a) What is the total heat transfer? (b) What is the boundary layer thickness at the center of the plate?

Answer #1

A square plate of 0.5 m length is heated to
temperature of 383 K. Air at 293 K and 1 atm flows over the plate
at 15 m/s. Calculate the total heat transferred. Determine the
convection heat transfer coefficient, thermal boundary layer, and
the velocity boundary layer at the trailing edge of the plate.

Water at 60°F flows over the top surface of the plate. If the
free-stream velocity is 1.0 ft/s, determine the boundary layer
disturbance thickness and momentum thickness at the back end of the
plate

A 0.100 m horizontal square plate has a constant surface heat
flux. The back side is insulated, so all of the heat is dissipated
from the side exposed to the flow of water over one side. Water at
a free stream temperature of 10.0° C. and a free stream velocity of
3.00 m/s flows over one side of the plate. Find the heat flux
possible if the plate temperature cannot exceed 80.0 ° C at any
point.

Problem 4: Air at 20°C and 1 atm flows over a horizontal flat
plate at 1 m/s. The plate is 20m by 1m and is maintained at 60°C.
If the flow is in the direction of smaller side, calculate the
power needed to maintain the surface temperature.
Also repeat problem 4 for a case where air velocity is zero.

Air at free-stream velocity of 9 m/s flows over a thin flat
plate of length 3 m and width 1.5 m. A laminar boundary layer
develops from the leading edge of the flat plate. At Rex = 500 000,
the boundary layer becomes a turbulent boundary layer where x is
the distance from the leading edge. ρair = 1.2 kg/m3 , μair = 1.8 x
10-5 kg/m.s (a) Estimate the length of the laminar boundary layer.
(b) Estimate the drag...

A square aluminum plate 5 mm thick and 150 mm on a side is
heated while vertically suspended in quiescent air at 75°C.
Determine the average heat transfer coefficient for the plate when
its temperature is 15°C by two methods: using results from the
similarity solution to the boundary layer equations, and using
results from an empirical correlation.
The answer should be close to 5.78 and 5.92 W/m^2K
Please show all work

Given: an atmospheric layer. Height is 5650 m, temperature is
-61◦C, pressure is 515 hPa, density is 0.678 kg m−3 , constant
vertical velocity of 9.8 cm s−1 . Over 20 minutes, atmospheric flow
between the 5650 m and 7745 m surfaces generates layer mean
temperature advection of 1.9◦C hr−1 . Calculate the pressure for
the 5650 m level after the 20 minutes have passed. With the
assumption that atmospheric flow is geostrophic.

A cylinder contains 0.200 mol of carbon dioxide (CO2) gas at a
temperature of 30.0 ∘C. The cylinder is provided with a
frictionless piston, which maintains a constant pressure of 1.00
atm on the gas. The cylinder is placed on a hot plate and a 920 J
of heat flows into the gas, thereby raising its temperature to 124
∘C. Assume that the CO2 may be treated as an ideal gas.
What is the change in internal energy of the...

71 mm thick horizontal plate made of an opaque material of
thermal conductivity k= 25 W/m-K. At the bottom, water flows at a
temperature of T∞,w = 25C, whereas air flows at the top of the
plate at T∞,a = 710 C having convection coefficient of ha= 71
W/m2-K. Assuming a diffused top of the plate that receives an
irradiated flux of 7100W/m2, of which 30% is reflected back. The
top and bottom surface temperatures are maintained at 43 C...

Saturated steam at 60 ºC is condensed over an array of 100
horizontal tubes, each with a diameter of 1.2 cm and a length of 3
m. The tube surfaces are maintained at a uniform temperature of 30
ºC. a) What is the pressure of the steam? _____________ kPa. (Note
that this could have been given instead of steam T.) Determine the
condensation rates on the tubes for b) a rectangular array of 5
tubes high by 20 tubes wide...

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