Solution :
Given :
h = 2 cm
Diameter of the tube , d = 1 mm
Diameter of the hose, D = 6 mm
Between 1 and 2, by applying Bernoulli's principle, we get
As point 1 is just below the free surface of liquid, so
Therefore, 111.325 kPa is the gas supply pressure required to keep the water from leaking back into the tube.
Velocity at point 2,
= 1.617 m/s
Flow of water,
Minimum air flow rate,
= 0.0449 m/s
b). Reynolds number in hose,
υ for water at 25 degree Celsius is
υ for air at 25 degree Celsius is
= 17.25
Therefore the flow is laminar.
Reynolds number in the pipe
= 1816.85, which is less than 2000.
So the flow is laminar inside the tube.
