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  chakravarthi.sarella answered this

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  When the flow enters the convergent pipe, the velocity increases as the relation between area and velocity are inversely proportional to each other.

  From the equation Q=AV. By considering Q as constant, Area is inversely proportional to the velocity.

  When the flow travels to a divergent zone, the velocity decreases as there is a lot of pockets of space and while filling this space it creates shear stress and eddies due to the sudden expansion of the pipe which loses the head and in turn energy. So, the flow must be steady to validate the Beronoulis principle.

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