Venturimeter

1)Venturimeter is the widely used device tomeasure the discharge through the pipe. 
2)A venturimeter consist of a convergence ,divergence,and throat.
3)The principle of venturimeter is that when a fluid flows through the venturimeter, it accelerates in the convergent section and decelerates in thedivergent section, resulting in a drop in the staticpressure.
3) By measuring the difference inthe pressures at an axial station upstream of the convergent section and at the throat, thevolumetric flow rate can be estimated.
4)The flow through the venturimeter and hence through the pipe is given by
Qactual = Actual discharge.
Qth=theoratica discharge
Cv =Discharge co-efficient.
A1 =area at the inlet side 
A2 =area at the throat side
h =Differential pressure head
dh=pressure difference 
g =Acceleration due to gravity
Applications:
 chemicalship tankersgas stoves , Water aspirators,,Steam siphons Carburetors .The capillaries.

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