A water pump increases the pressure of the water passing through it (Fig. P149). The flow is

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A water pump increases the pressure of the water passing through it (Fig. P14–9). The flow is assumed to be incompressible. For each of the three cases listed below, how does average water speed change across the pump? In particular, is Vout less than, equal to, or greater than Vin? Show your equations, and explain.

(a) Outlet diameter is less than inlet diameter (Dout in)

(b) Outlet and inlet diameters are equal (Dout = Din)

(c) Outlet diameter is greater than inlet diameter (Dout > Din)


FIGURE P14–9

Pin Pump Dout Vout Pout

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