Introduction:
Energy is the
ability to do work. It manifests in various forms and can change from one form
to another. The various forms of energy present in fluid flow are elevation,
kinetic, pressure and internal energies. Daniel Bernoulli in the year 1738 stated
that in a steady flow system of frictionless (of non-viscous) incompressible
fluid, the sum of pressure, elevation and velocity heads remains constant at
every section, provided no energy is added to or taken out by an external
source.
This statement
of Daniel Bernoulli, known as the Bernoulli’s Energy Equation, can be applied
in practice for the construction of flow measuring devices such as Venturi
meter, flow nozzle, orifice meter and Pilot tube. Furthermore, it can be
applied to the problems of flow under a sluice gate, free liquid jet, radial
flow and free vortex motion.
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