Question

1.Water flows over a flat plate as film of thickness 0.1 mm. Calculate the average water velocity and the maximum velocity if the flow is in laminar condition.

Answer 1

Explanation:

Answer is 57.5 cm/sec.

Reynolds's formula for fluid flow:

Re = row * v * D / μ

Re = Reynolds's number < 2300 for laminar stream lined non-turbulent flow. row = density = 1000 kg/m^3

μ = dynamic or kinematic viscosity = 0.00125 Pa-s.

D = inner diameter = 0.005 meter.

So v = Re * μ / (row* D)

v < 57.5 cm/s.