Kinematics of Fluid Flow Its Application
Transcript of Kinematics of Fluid Flow Its Application
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Government College Of Engineering, Aurangabad.
By:-
Nikhil Pakwanne
Kinematics Of Fluid Flow & It’s
Application.
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Kinematics Of Fluid Flow & It’s
Application.
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What Is Kinematics Of Fluid?
Fluid Kinematics is the study of fluid in motion where pressure forces are not considered.
It is generally a continuous function in space and time.
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METHODS OF DESCRIBING FLUID MOTION:-
Lagrangian Method:-
Describes a defined mass (position, velocity, acceleration, pressure, temperature, etc.) as functions of time.
Ex:- Track the location of a migrating bird.
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Eulerian Method :-
Describes the flow field (velocity, acceleration, pressure, temperature, etc.) as functions of position and time.
Ex:- Count the birds passing a particular location.
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Types Of Fluid Flow:-
1) Steady & Unsteady Flows.
2) Uniform & Non-uniform Flows.
3) Laminar & Turbulent Flows.
4) Compressible & Incompressible Flows.
5) Rotational & Irrotational Flows. 6) One , Two & Three Dimensional Flows.
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Steady & Unsteady Flows:-
Steady Flows:-
In which the fluid Characteristics Like velocity, pressure, density , etc. At a Point do not change with time.
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Unsteady Flow:-
In which the fluid velocity , pressure or density at a point changes with respect to time.
Changing in time
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Uniform & Non-uniform Flow :-
Uniform Flow:-
In which the velocity at given time does not change with respect to space ( length of direction of the flow ).
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Non-Uniform Flow:-
In which the velocity at any time changes with respect to space.
Changing in space
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LAMINAR & TURBULENT FLOWS:-
Laminar Flow:- in which the
fluid particles move along well defined paths or stream line.
Fig. Laminar Flow
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Turbulent Flow:-
fluid moves in very irregular paths or zig –zag Way.
efficient mixing.
velocity at a point fluctuates.
Fig. Turbulent Flow
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Compressible & Incompressible Flows:-
Compressible Flows:-
In which the density of the fluid changes from point to point. The density is not constant for the fluid.
Incompressible Flows:-
In which the density of fluid changes from point to point. the density is constant for the fluid.
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Rotational & Irrotational Flows:-
Rotational Flows :-
In which the fluid particles while flowing along stream lines, Also rotate about their own axis.
Irrotational Flows:-
In which the fluid particles while flowing along stream lines, do not rotate about their own axis.
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One Dimensional Flow:-
One , Two & Three Dimensional Flows:-
In which the flow parameter such as velocity is a function of time and
one space co-ordinate only.
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Two Dimensional Flows:-
In which the velocity is a function of time and
two rectangular space co-ordinates.
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Three Dimensional Flows:-
In which the velocity is the function of time and
Three mutually perpendicular directions.
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Flow Visualization is the visual examination of flow-field features.
Important for both physical experiments and Numerical Solutions.
Numerous Methods:-
1) Streamlines.
2) Pathlines.
3) Streaklines.
Flow Visualization:-
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Streamline:-
A Streamline is a curve that is everywhere tangent to the instantaneous local velocity vector.
It has the direction of the velocity vector at each point no. of flow across the streamline.
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steady flow streamlines are fixed in space.
But, unsteady flow streamlines moves. Fig. Streamline
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Pathline:-
A Pathline is the actual path travelled by an individual fluid particle over some time period.
Same as the fluid particle's material position vector .
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And the path of a particle same as Streamline for Steady Flow.
Fig. Pathline
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Streakline:-
A streakline is the locus of fluid particles that have passed sequentially through a prescribed point in the flow.
Easy to generate in experiments like dye in a water flow, or smoke in an airflow.
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And a tracer injected continuously into
a flow.
same as pathline and streamline
for steady flow.Fig.Streakline
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FLUID MECHANICS BY BANSAL
http://en.wikipedia.org
REFERENCES
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Thank You
Appreciate your time and attention!