Question

If water flows along both sides of a 5 m-long flat plate with a
velocity of 60 m/s at 20^{o}C, 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/s^{2}) on the
plate if each surface of the plate is 550 m^{2}.

Answer #1

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...

In a lab experiment for a flat plate zero-pressure gradient
boundary layer it is desired to find the friction coefficient (Cf)
at location x=1 m from the leading edge of the plate. In order to
do this, the momentum thickness of the boundary layer is measured
at two locations 0.005m on either side of x=1m. the momentum
thickness is measured to be 1.638 mm at x=0.995m and 1.652mm at
x=1.005m, respectively, when the approach or free-stream velocity
is 5m/s.
a)...

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.

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

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 ??...

Find the drag force acting on a 0.5 m square flat plate when
water flows over the top of the plate at a speed of 13 m/s (in
N)

1-a body with m = 3 Kg and it's velocity at certain time is 9
m/s and he cross a distance 18 m at 3 second ,
tell what is the force acting on it and find the magnitude of
the force .
2- a thin plate with area 0.08 m2 , isolated from
another plate by liquid layer with thickness 3 mm.
if a tangent force acting on it by 6.3 N the it moved by
velocity 33 cm/s,...

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 plate is subjected to local pressure in open condition of 90
kPa. Air flows through a plate at 6 m/s of velocity and temperature
measured at 25oC with a 8m length X 2.5m wide section.
Solve the problem if considering air flows parallel to side by side
of flat plate by determine the drag force that overcome the plate
on the top surface for
i) 8 m long side
ii) 2.5 m long side

(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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