We
were discussing the basic concepts and also difference between Notches and Weirs in
the subject of fluid mechanics in our recent posts.Â
Now
we will go ahead to find out the various classifications of Notches and Weirs
with the help of this post.Â
NotchÂ
Notch
is basically defined as a device which is used for determining the flow of
liquid through a small channel or a tank.Â
Notches
might be defined as the opening provided in one side of a tank or reservoir or
a small channel in such a way that the liquid surface in the tank or channel is
below the top edge of opening.Â
Classification of notchesÂ
There
are following types of notches on the basis of shape of opening and these are
as mentioned hereÂ
Rectangular
NotchÂ
Triangular
Notch or V- notchÂ
Trapezoidal
NotchÂ
Stepped
NotchÂ
There
are following types of notches on the basis of the effect of sides on the nappe
and these are as mentioned hereÂ
- Notch with end contractionÂ
- Notch without end contraction or suppressed notchÂ
WeirÂ
A weir will be basically a concrete or
masonary structure which will be located in an open channel over which flow
will take place.Â
We
can also define as the structure constructed across the river or large canal
for storing water on upstream side.Â
Weir
will be usually in the form of vertical wall, with a sharp edge at the top,
running all the way across the open channel.Â
Classification of weirsÂ
There
are following types of weirs on the basis of shape of opening and these are as
mentioned hereÂ
- Rectangular weirÂ
- Triangular weirÂ
- Trapezoidal or Cippoletti weirÂ
There
are following types of weirs on the basis of shape of the crest and these are
as mentioned hereÂ
- Sharp crested weirÂ
- Broad crested weirÂ
- Narrow crested weirÂ
- Ogee shaped weir Â
There
are following types of weirs on the basis of the effect of sides on the
emerging nappe and these are as mentioned hereÂ
- Weirs with end contractionÂ
- Weirs without end contraction or suppressed notchÂ
Now
we will go ahead to find out the classifications of notches and weirs, in the
subject of fluid mechanics, in our next post.Â
Do
you have any suggestions? Please write in comment box.Â
Reference:Â
Fluid
mechanics, By R. K. BansalÂ
Image Courtesy: GoogleÂ
Image Courtesy: GoogleÂ
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