A fire hose has an inside diameter of 6.40 cm. Supposesuch a hose carries a flow of 40.0 L/s starting at a gaugepressure of 1.62×106 N/m2 . The hose goes 10.0 m up aladder to a nozzle having an inside diameter of 3.00 cm.Calculate the Reynolds numbers for flow in the fire hose andnozzle to show that the flow in each must be turbulent.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
A fire hose has an inside diameter of 6.40 cm. Suppose
such a hose carries a flow of 40.0 L/s starting at a gauge
pressure of 1.62×106 N/m2 . The hose goes 10.0 m up a
ladder to a nozzle having an inside diameter of 3.00 cm.
Calculate the Reynolds numbers for flow in the fire hose and
nozzle to show that the flow in each must be turbulent.
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