includes flow patterns and types of flow basics

1. SNPIT &RC
PRESENTATION ON: Flow pattern and Types of flow
MADE BY: Civil-B (3rd SEM)
SUBJECT : Fluid Mechanics(2130602)
GUIDED BY: Sarika Javiya Mam
Bankim Joshi Sir

2. CREW MEMBERS PEN NO.
1.Kathan Sindhvad = 160490106087
2.Vishal Sharma = 160490106085
3.Malhar Shukla = 160490106086
4.Upadhyay Nishank = 160490106092

3. Flow Patterns
 Streamlines are a family of curves that are
instantaneously tangent to the velocity vector of the
flow. These show the direction in which a massless fluid
element will travel at any point in time.
 Streaklines are the loci of points of all the fluid particles
that have passed continuously through a particular
spatial point in the past. Dye steadily injected into the
fluid at a fixed point extends along a streakline.
 Pathlines are the trajectories that individual fluid
particles follow. These can be thought of as "recording"
the path of a fluid element in the flow over a certain
period. The direction the path takes will be determined
by the streamlines of the fluid at each moment in time.

4.  Streamtube is a tubular region of fluid surrounded by
streamlines. Since streamlines don't intersect, the same
streamlines pass through a streamtube at all points
along its length
 Timelines are the lines formed by a set of fluid particles
that were marked at a previous instant in time, creating a
line or a curve that is displaced in time as the particles
move.

5. Types of flows
 ‘Steady flow’ defined as that in which the various
parameters at any point do not change with time.
 Flow in which changes with time do occur is termed
‘Unsteady’ or ‘Non-steady’.

6.  The flow is defined as ‘uniform flow’ when in the flow
field the velocity and other hydrodynamic parameters do
not change from point to point at any instant of time.
 When the velocity and other hydrodynamic parameters
changes from one point to another the flow is defined as
‘non-uniform flow’.

7.  ‘Laminar flow’is a fluid flow in which the fluid layers
move parallel to each other and do not cross each other.
 Turbulent flow is a fluid flow in which the fluid layers
cross each other and do not move parallel to each other.

8.  When the volume and therby density of fluid changes
aprreciablydruing flow,the flow is said to be
‘Compressible flow’.
 If the volume and therby the density of fluid changes
insignificantly in the flow field is said to be
‘Incompressible flow’.

9.  Fluid flow in which all flow is parallel to some straight
line, and characteristics of flow do not change in moving
perpendicular to this line is ‘One dimensional flow’or
‘1-D flow’.
 Fluid motion can be said to be a ‘Two-dimensional
flow’ or ‘2-D flow’ when the flow velocity at every
point is parallel to a fixed plane. The velocity at any
point on a given normal to that fixed plane should be
constant.

10.  ‘Three dimensional flow’is that type of flow in which
flow parameters vary in all three directions.
1-D flow 2-D flow
3-D flow

11.  If the angle between the two intersecting lines of the
boundary of the fluid element changes while moving in
the flow, then the flow is a ‘Rotational Flow’.
 If the fluid element rotates as a whole and there is no
change in angles between the boundary lines then the
flow cannot be Rotational Flow, so it is ‘Irrotational
Flow’.