ABSTRACT
Gases and liquids are generally termed as fluids. Though the physical properties of gases and liquids are different, they are grouped under the same heading since both can be made to flow unlike a solid. The property which characterizes the resistance that a fluid offers to applied shear force is termed viscosity. The kinematic viscosity coefficient is a convenient form of expressing the viscosity of a fluid. The change in volume of a fluid associated with change in pressure is called compressibility. When a fluid is subjected to pressure it gets compressed and its volume changes. Basically two treatments are followed for fluid flow analysis. They are the Lagrangian and Eulerian descriptions. Streakline may be defined as the instantaneous locus of all the fluid elements that have passed the point of injection at some earlier time. Separation point is the position at which the boundary layer leaves the surface of a solid body.
