A converging-diverging tube, called a venturi, develops a
low-pressure airflow in the throat capable of sucking a heavier
fluid up a reservoir, as shown in the figure. This is the working
principle of paint spraying guns. The specific masses of air and
liquid are respectively , while the throat and discharge
diameters in the atmosphere are respectively D1 and D2.
If the elevation height above the liquid level in the reservoir is
h and the gravitational acceleration is g, deduce an expression for
the volumetric flow rate of air Q sufficient to begin to bring
fluid from the reservoir into the throat. Despise the losses.
Mass conservation:
Let the volume flow rate of air be Q
Now the velocity of air flow will be:
Now at the throat, using the continuity equation the velocity will be
Now applying Bernoulli's theorem
Hence
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A converging-diverging tube, called a venturi, develops a low-pressure airflow in the throat capable of sucking...
Narrowing of a conduit, called Venturi, produces low pressure in the throat, which allows you to suck fluid from a reservoir, as it is shown in the Figure. Through the equation of Bernoulli, get an expression for the minimum V1 speed needed to bring the fluid to the Throat. D2, D V V2P2 =P Agua h Pa Agua