Question: In a simple shear flow through a circular pipe due to pressure gradient, if the diameter D is decreased to D/4, how should the

In a simple shear flow through a circular pipe due to pressure gradient, if the diameter D is decreased to

In a simple shear flow through a circular pipe due to pressure gradient, if the diameter D is decreased to D/4, how should the inlet-outlet pressure difference Ap change to maintain the same flow rate?

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