For a
convergent nozzle, if the exit pressure is less than critical pressure, the
mass rate of flow will be -
Increasing
Decreasing
Zero
Constant
Constant
For a
convergent nozzle, if the exit pressure is less than critical pressure, the
mass rate of flow will be constant. This condition is known as Chocking of
nozzle.
Choked flow
is a fluid dynamic condition associated with the venturi effect. When a flowing
fluid at a given pressure and temperature passes through a constriction (such
as the throat of a convergent-divergent nozzle or a valve in a pipe)
into a lower pressure environment the fluid velocity increases.
Hence, the correct option is (D).
&Key Points:-
A convergent
nozzle is a nozzle that starts big and gets smaller (decrease in
cross-sectional area). As a fluid enters the smaller cross-section, it has to
speed up due to the conservation of mass. To maintain a constant amount of
fluid moving through the restricted portion of the nozzle, the fluid must
move faster.
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