Fluid Mechanics (Part-4) (General Engineering) (SSC JE)

Ideal fluid–Those fluids which are incompressible and non viscous with infinite bulk modulus, known as ideal fluids.
Ideal fluids does not obeys Newton's law of viscosity.
Properties–
(i) Density of fluid is constant
(ii) Zero surface tension and frictionless
(iii) No shear resistance
(iv) Particle of fluid should be irrotational

When a man is standing on a boat in still water and walks in the boat towards the shore then as per Newton's third law the boat will move away from the shore because a shear force in the form of reaction force is applied at the surface of boat in opposite direction of motion of legs.

The sum of piezometric head and velocity head remains constant as per Bernouli's equation . So , for constant piezometric head line passing through two point , the velocity will remain same .

Atmospheric pressure–The force per unit area exerted by atmospheric of earth is known as atmospheric pressure. It is measured by barometer so that it is also called as barometric pressure.
• Gauge pressure is measured by manometers.

Compressibility Factor (z)– This factor represents the deviation of real gases from the behaviour of ideal gas. Mathematically,

Momentum correction factor– It is define as the ratio of momentum/second based on average velocity.

Parabolically across the section– The expression for velocity of flow between two parallel states is given by
• It is clear from the expression that the velocity distribution between two plates is parabolic with maximum value at the center and minimum (zero) at the boundary/plate surface.