What are different types of flow in open channel flow??
TYPES OF FLOW IN OPEN CHANNELS
Steady and unsteady flow
Uniform and non-uniform flow
Laminar andTurbulent flow
Subcritical, critical and supercriticalflow
Laminar and Turbulent Flow: For open channels, it is defined with Reynolds No.as;Therefore,
For laminar flow: Re < 500
For Turbulentflow: Re >1000
For transitional flow: 500 < Re <1000
For laminar flow: Re < 2000
For Turbulent flow: Re > 4000
Transitional 2000 < Re < 4000
Rh = hydraulic radius = A
If width/depth > 10 then R ≅deptℎ
Subcritical, Critical and Supercritical Flow:
These are classified with Froude number.Froude No. (Fr) is ratio of inertial force to gravitational force of flowing fluid.
Mathematically, Froude no.is
Fr. < 1 Flow is subcriticalflow
Fr. = 1 Flow is criticalflow
Fr. > 1 Flow is supercriticalflow
Where, V is average velocity of flow, h is depth of flow and g is gravitational acceleration.