**1. Uniform flow:**A flow, in which the liquid particles at all sections of a pipe or channel have the same velocities, is called a uniform flow.

**2. Non-uniform flow:**A flow, in which the liquid particles at different sections of a pipe or channel have different velocities, is called a non-uniform flow.

**3. Streamline flow:**A flow, in which each liquid particle has a definite path and the paths of individual particles do not cross each other, is called a streamline flow.

**4. Turbulent flow:**A flow, in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called a turbulent flow.

**5. Steady flow:**A flow, in which the quantity of liquid flowing per second is constant, is called a steady flow. A steady flow may be uniform or non - uniform.

**6. Unsteady flow:**A flow, in which the quantity of liquid flowing per second is not constant, is called an unsteady flow.

**7. Compressible flow:**A flow, in which the volume of a fluid and its density changes during the flow, is called a compressible flow. All the gases are considered to have compressible flow.

**8. Incompressible flow:**A flow, in which the volume of a fluid and its density does not change during the flow, is called an incompressible flow. All the liquids are considered to have incompressible flow.

**9. Rotational flow:**A flow, in which the fluid particles also rotate (i.e. have some angular velocity) about their own axes while flowing, is called a rotational flow.

**10. Irrotational flow:**A flow, in which the fluid particles do not rotate about their own axes and retain their original orientations, is called an irrotational flow.

**11. One-dimensional flow:**A flow, in which the streamlines of its moving particles are represented by straight line, is called an one-dimensional flow.

**12. Two-dimensional flow:**A flow, whose streamlines of its moving particles are represented by a curve, is called a two-dimensional flow.

**13. Three - dimensional flow:**A flow, whose streamlines are represented in space i.e. along the three mutually perpendicular directions, is called a three - dimensional flow.

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