Thursday, March 10, 2016

Fluid Mechanics 2 Marks _ 1 Unit

Define Newtonian law of Viscosity?

According to Newton’s law of viscosity the shear force F acting between two
layers of fluid is proportional to the difference in their velocities du and area
A of the plate and inversely proportional to the distance between them.

What is cohesion and adhesion in fluids?

Cohesion is due to the force of attraction between the molecules of the same
liquid.
Adhesion is due to the force of attraction between the molecules of two
different liquids or between the molecules of the liquid and molecules of the
solid boundary surface.

Define fluids?

Fluid may be defined as a substance which is capable of flowing. It has no
definite shape of its own, but confirms to the shape of the containing vessel.

What are the properties of ideal fluid?

Ideal fluids have following properties
i) It is incompressible
ii) It has zero viscosity
iii) Shear force is zero

What are the properties of real fluid?

Real fluids have following properties
i) It is compressible
ii) They are viscous in nature
iii) Shear force exists always in such fluids.

Define Surface tension and Capillarity?

Surface tension is due to the force of cohesion between the liquid particles at
the free surface.
Capillary is a phenomenon of rise or fall of liquid surface relative to the
adjacent general level of liquid.

Define Viscosity?

It is defined as the property of a liquid due to which it offers resistance to the
movement of one layer of liquid over another adjacent layer.

Define Compressibility?

It is the property by virtue of which fluids undergoes a change in volume
under the action of external pressure.

Define Specific volume and Specific Gravity?

Specific volume is defined as volume of fluid occupied by unit mass (m
3
/kg)
Specific gravity is defined as the ratio of specific weight of fluid to the
specific weight of standard fluid.

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