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Cjb01203 · Nov 23, 2008, 09:38 PM

A 6cm pipe narrows to 4cm. When water flows at a certain rate the pressures are 32kPa and 24kPa. What is volume rate of flow?

ebaines · Nov 24, 2008, 11:39 AM

Use Bernoulli's equation:

$ P_{Static} + \frac 1 2 \rho V^2 + \rho g h = Constant $

So here:

$ P_1 + \frac 1 2 \rho V_1^2 = P_2 + \frac 1 2 \rho V_2 ^2 $

and also from constant volume flow:

$ V_1 * A_1 = V_2 * A_2 $

That gives you enough to complete the problem.