Unit Operation Presentation (Chemistry)
serjoo331
open_channel__notch.pptxContents :
Introduction About Open Channel
Difference Between Open Channel and Pipe
Classification Of Flow
The Factors That Effect On The Flow
Types Of Open Channel
Introduction About Notch
Types Of Notch
Advantages And Disadvantages Of Weirs
Introduction About Open Channel :
Definition : is a type of liquid flow within a conduit with
free surface.
The other type of flow within a conduit is pipe flow.
Difference Between Open Channel and Pipe :
1 - Free surface is present in OCF
2 - Open Channels may have any
shape.
3 - In OCF driving force is the
gravity and the flow direction.
4 - A free surface is subject to
atmospheric pressure.
1 - Free surface is absent in pipe
flow.
2 - Pipes are generally cross
section.
3 - In pipe flow driving force is the pressure force &the flow direction.
4 - No direct atmospheric pressure.
Classification Of Flow :
1- Steady Flow & Unsteady Flow
Steady flow happen when flow at any point (depth and velocity) does not change with time.
Unsteady flow happen when flow at any point (depth and velocity) change with time.
2 - Uniform flow & Non uniform flow:
Uniform flow : When the flow properties, the depth of flow in an open channel remain constant along the length of the channel.
Non uniform flow: When the flow properties, depth & velocity are not constant along the length of the channel is called non-uniform flow.
Classification Of Flow :
The Factors That Effect On The Flow :
1. Channel shape 2. Fluid depth
3. Fluid velocity 4. Slope of channel
The Types Of Open Channel :
Triangular channel
Rectangular Channel
Trapezoidal Channel
Circular Channel
Introduction about Weirs:
Weirs are overflow structures that stretch across an open
channel, and are meant to change the channel’s
flow characteristics making it easier to measure the
volumetric rate.
Types of Weirs :
Rectangular
Triangular
Trapezoidal
Rectangular Weirs :
Triangular (V-Notch) Weirs:
Trapezoidal Weir :
Advantages and Disadvantages of Weirs
Conclusions
