Question

why the divergent cone is longer than convergent cone in Venturi meter?
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Answer 1

This cone angle of diverging section is kept small to avoid flow separation. Flow separation increases frictional drag. Since flow separation is not experienced while converging, the converging section is shorter.

Answer 2

Answer:

The divergent cone of the Venturi meter is made longer with a gradual divergence so that the flow separation and the consequent energy loss is minimum.

Explanation:

• The divergent part of a Venturi meter is longer than the convergent part to avoid flow separation.
• When liquid enters the convergent part in accordance with continuity it accelerates and retards while passing through the divergent part.

• Sudden acceleration can cause flow separation and due to this the divergent cone is longer than convergent cone in Venturi meter.