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It is an imaginary line such that when a tangent is drawn at any point it gives the velocity of the fluid particle at that point and at that instant. Fig. Stream lines

*Stream Lines*

It is
an imaginary line
such that when
a tangent is
drawn at any
point it gives
the

velocity of the fluid particle at
that point and at that instant. Fig. 8 Stream lines

Eg: Path traced by the flow when
an obstruction like, a sphere or a stick is kept during its motion. The flow
breaks up before the obstruction and joins after it crosses it.

*Streak lines*

It is that imaginary line that
connects all the fluid particles that has gone through a point/section over a
period of time in a fluid motion.

*Stream tube:*

It is an imaginary tube formed by
stream line on its surface such that the flow only enters the tub from one side
and leaves it on the other side only. No flow takes place across the stream
tube. This concept will help in the analysis of fluid motion.

**Variation of a Property
along any given direction**

If *P*
is a Property
at any point,
then the property
at any other location along *x
*

direction
at a distance *dx* is given by

Fig. 12
Variation of a property along x direction

New
Property = Old Property + slope x Old Property x distance

Tags : Civil - Mechanics Of Fluids - Fluid Kinematics And Dynamics

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