What are the different types of fluid flow

     What are the different types of  fluid flow

   a)  Steady flow: It is defined as that type of flow in which the fluid characteristic like velocity, pressure, density do not change with time.

   b)  Unsteady flow: It is defined as that type of flow in which the fluid characteristic like velocity, pressure, density etc at a point changes with time.

   c)   Uniform flow: The velocity of flow of a fluid, if constant at any section in the path of fluid flow, then it is called uniform flow. Example – Liquid through a pipe of  uniform cross section.

   d)  Non-uniform flow: The velocity of a fluid, if not constant at any section in the path of the fluid flow, then it is called non-uniform flow. Example: Liquid flows through a pipeline of variable diameter.

   e)  Rotational flow: Rotational flow is that type of flow in which fluid particles while flowing along stream line, also rotates about their own axis.

    f)    Irrotational flow: Irrotational flow is a flow in which each element of the moving fluid undergoes no net rotation with respect to a chosen coordinate axes from one instant to other. A well-known example of irrotational motion is that of the carriages of the Ferris wheel (giant wheel). In a Ferris wheel although each carriage follows a circular path as the wheel revolves, it does not rotate with respect to the earth, as a result the passengers remain upright and continue to face the same direction.

    g)   Laminar flow: It is defined as that type of flow, in which fluid particles, moves in a well defined path or stream line. All the stream lines are straight and parallel. The path of one particle dose not cross the path of any other particle.

    h) Turbulent flow: Turbulent flow is a type of fluid (gas or liquid) flow in which the fluid undergoes irregular fluctuations, or mixing, in contrast to laminar flow, in which the fluid moves in smooth paths or layers. In turbulent flow the speed of the fluid at a point is continuously undergoing changes in both magnitude and direction. The flow of wind and rivers is generally turbulent in this sense, even if the currents are gentle. The air or water swirls and eddies while its overall bulk moves along a specific direction.