• Card 4 / 41: For ideal (no frictional losses) flow of an incompressible fluid through a sudden expansion, which of the following best describes how the Bernoulli equation predicts that the pressure will change?
    A) The pressure will be lower after the expansion than before.
    B) The pressure will be the same before and after the expansion.
    C) The pressure will be larger after the expansion than before.
    D) The flow will stagnate after the expansion.

    Answer:
    C) The pressure will be larger after the expansion than before.

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Explanation:

Since the fluid is incompressible, the fluid velocity will be slower after the expansion. Hence the pressure must rise.

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Fluid Mechanics ME201

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Attribution:  Stephanie Redfern and Tuan Dinh. Fluid Mechanics. The Saylor Academy 2014, http://www.saylor.org/courses/me201/
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