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A circular reentrant orifice (also called Borda’s mouthpiece) of diameter D is placed at a depth h below the surface of a tank.  and assuming that the speed of approach v1 is zero, show that the...

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A circular reentrant orifice (also called Borda’s mouthpiece) of diameter D is placed at a depth h below the surface of a tank.  and assuming that the speed of approach v1 is zero, show that the diameter of the stream is

Answered Same Day Dec 25, 2021

Solution

Robert answered on Dec 25 2021
126 Votes
From hydrostatics, the pressure at section 1 is 1p rh gh 
The pressure at section 2 is 2 0p 
Calculate the mass flow rate using section 2.
   2 2
2
mass density volume density area length
m A l A v t
dm m
A v
dt t
 

    
    

 


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