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abhinay chavan · Oct 23, 2013, 11:38 AM

We know that pressure is inversily proportional to area but when fluid is flowing through the venturimeter the diameter of venturimeter is reduces so it is expected that the pressure is increases but it not in real why?give ans immediately.

ebaines · Oct 23, 2013, 11:50 AM

Originally Posted by abhinay chavan

We know that pressure is inversily proportional to area

This is only true if there is a constant total force. In general this does not apply to fluids.

Originally Posted by abhinay chavan

but when fluid is flowing through the venturimeter the diameter of venturimeter is reduces so it is expected that the pressure is increases but it not in real why?

Are you familiar with the Bernoulli Equation? Conservation of energy in fluid flow results in:

$\frac {v^2} 2 + gz + \frac P {\rho} = Constant$

So as v increases if z is constant (i.e. Horizontal flow) then P must be reduced.

Originally Posted by abhinay chavan

give ans immediately.

You're welcome.