This document summarizes different types of fluid flow patterns and flow characteristics. It defines streamlines, streaklines, pathlines, and timelines as ways to visualize fluid flow. It then describes various types of flow, including steady/unsteady, uniform/non-uniform, laminar/turbulent, compressible/incompressible, one-dimensional/two-dimensional/three-dimensional, rotational/irrotational flows. The document was presented by a group of civil engineering students on fluid mechanics.

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’.