Question

A
smooth rectangular plate 0.6 m wide by 24m long moves at a speed of
12 m / sec in the direction of its length through a mass of oil.
Calculate the resistance on the plate and the thickness of the
boundary layer at the trailing edge.

Answer #1

A smooth flat plate of length ℓ = 4 m and width b = 2 m is
placed in water with an upstream velocity of U = 0.1 m/s.
1) Is the flow laminar or turbulent?
2) Determine the boundary layer thickness at the center and the
trailing edge of the plate.
3) Determine the wall shear stress at the center and the trailing
edge of the plate.

L = 6 m long and w = 4 m wide, smooth, flat plate, upstream
speed
It is placed in water where U = 0.5 m / s. Plate by accepting
laminar boundary layer
over:
a) boundary layer thicknesses (separately at x = L / 2 and at the
exit end of the plate).
b) wall shear stresses (separately at x = L / 2 and at the outlet
end of the plate).
Calculate.
For water: ? = 1000 ??...

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.

If water flows along both sides of a 5 m-long flat plate with a
velocity of 60 m/s at 20oC, what will be the boundary
layer thickness (cm) at a position 4 m from the leading edge?
Indicate whether the boundary layer is laminar or turbulent.
Calculate the total drag force (N or kg m/s2) on the
plate if each surface of the plate is 550 m2.

A rectangular metal plate measures 0.14 m long and 0.7 m wide.
The plate is heated to a temperature of 1,233 K by passing a
current through it. Assuming that it behaves like a blackbody, how
much power does the plate radiate under these conditions?
Please ensure you're correct, the last person had been
wrong.

A 4m ^ 2 plate of 18 gauge steel moves forward at a speed of 2m
/ s, while the base of the conveyor belt moves in the opposite
direction at a speed of 0.5m / s. Between the conveyor belt and the
plate is a 2.5mm thick layer of wax with a viscosity of 2
Pa-s.
Determine:
a) The pressure under the steel plate
b) The necessary force necessary to move the steel plate to the
right.
Additional data...

A hydrofoil which is 50 cm long moves in seawater at 20°C.
a)
If the plate is 5.6 m
wide and moves at 32 knots, use the flat-plate theory with
Retr= 5E5 to estimate its drag in N
for a smooth wall. Round the final answer to the nearest whole
number.
---------N
b)
If the hydrofoil is
5.6 m wide and moves at 32 knots, use the flat-plate theory with
Retr = 5E5 to estimate its drag in N for...

A 370 -m-wide river has a uniform flow speed of 1.1 m/s through
a jungle and toward the east. An explorer wishes to leave a small
clearing on the south bank and cross the river in a powerboat that
moves at a constant speed of 7.6 m/s with respect to the water.
There is a clearing on the north bank 18 m upstream from a point
directly opposite the clearing on the south bank. (a) At what
angle, measured relative...

an
electron moves with a speed of 8x10 ^ 3 m / s in a circular path of
1cm radius within a solenoid of 2cm radius and 8 cm in length. Find
a) the intensity of the magnetic field inside the solenoid, b) the
current flowing in it if it has 20 turns per cm and c) its
inductance. d) draw a picture indicating the direction of the
current through the solenoid, the generated magnetic field and the
electron rotation

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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