Question

$\tt{Short \ notes \ on -}$

$\tt{1. \ Ideal \ fluid}$

$\tt{2. \ Working \ of \ Atomizer}$
$<marquee>$
$\mathfrak{No \ spams, \ copied \ answer.}$

Answer 1

$<u><h2>Ideal Fluid</u></h2>$

An ideal fluid is one which is non-viscous, incompressible, and its flow is steady and irrotational.

( I ) $<b>Steady Flow :</b>$ In a steady flow, the fluid velocity at each point doesn't change with time, either in magnitude of direction.

( II ) $<b>Incompressible flow :</b>$ The density of the fluid remains constant during its flow.

( III ) $<b>Non-viscous flow :</b>$ The fluid offers no internal friction. An object moving with through this fluid doesn't experience a regarding force.

( IV ) $<b>Irrotational flow :</b>$ This means that there is no angular momentum of the fluid about any point. A very small wheel placed at any point inside such a fluid doesn't rotate about its centre of mass.

$<h2><u>Atomizer</u></h2>$

The working of an Atomizer which is used to spread liquids is based on Bernoulli's principle.

$<i>[ See the picture of Atomizer in Attachment. ]</i>$

When the balloon is pressed, the air rushes out of the horizontal tube B decreasing the pressure to $\sf{P_2}$ which is less than the atmospheric pressure $\sf{P_1}$ in the container. As a results, the liquid rises up in the vertical tube A. When it collides with the high speed air in tube B, it breaks up into a fine spray.

Answer 2

When a fluid flows into a narrower channel, its speed increases. That means its kinetic energy also increases. Where does that change in kinetic energy come from? The increased kinetic energy comes from the net work done on the fluid to push it into the channel and the work done on the fluid by the gravitational force, if the fluid changes vertical position. Recall the work-energy theorem,

W

net

=

1

2

m

v

2

−

1

2

m

v

0

2

.

There is a pressure difference when the channel narrows. This pressure difference results in a net force on the fluid: recall that pressure times area equals force. The net work done increases the fluid’s kinetic energy. As a result, the pressure will drop in a rapidly-moving fluid, whether or not the fluid is confined to a tube.

hope it helps you