According to equation of continuity og liquid flows or fundamental equation of liquid flow,if an incompressible liquid flow con- tinuously through a pipe or channel, the discharge remains the same irrespective of the cross - section.
Laminar flow -: The flow in which path of the individual particles of liquid do not cross each other, is called stream line flow or " laminar flow " .Reynolds number is less than 2000 for laminar flow.
Turbulent flow -: In this type of flow path of the individual particles cross each other and particles do not have a definite paths called turbulent flow. For turbulent flow Reynolds number is more than 4000.
Uniform flow -: In uniform flow the ve - locities of liquid particles at the all section of the pipe , channel are equal. This generally refers to flows in channel.
Non-uniform flow -: The flow in which ve - locities,of liquid particles at all section of the pipe or channel are not equal is called " non- uniform flow " .
Steady flow -: In this type of flow, the quantity of liquid flowing per second is constant is called stream line flow.
Unsteady flow-: The flow in which the quantity of liquid flowing per second is not constant is called " unsteady flow ".
Stream line-: The imaginary line, tangent to which , at any point indicates the direction of the motion at the point , is called " stream line " .
Streak and potential line -: The line in which the instantaneous positions of all fluid particles which have passed through a given point , is called streak line .
And the line joining the points of equal potential on adjacent flow lines, is called the " potential line or equipotential line " .
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