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 October 18th, 2019, 07:34 AM #1 Member   Joined: Feb 2018 From: Iran Posts: 57 Thanks: 3 bernoulli's law The height of a funnel is 20cm if the upper diameter is 20cm and the lower diameter is 2cm find the pressure difference between two cross sectional areas if in every second 0.3L of water pass through the funnel? P.s I translate this question from Persian sorry if there is any grammatical mistake or misspelling October 18th, 2019, 08:17 AM #2 Senior Member   Joined: Jun 2019 From: USA Posts: 380 Thanks: 205 Assume a one-dimensional profile* (velocity is constant at each cross-section). Treat the water as incompressible, so density $\rho$ is constant. Conservation of mass: $\displaystyle \dot{m}=\rho V_1 \left( \frac{\pi D_1^2}{4} \right)=\rho V_2 \left( \frac{\pi D_2^2}{4} \right) = 0.3~L/s$ Find $V_1$ and $V_2$, and plug into Bernoulli's equation. *Velocity will be zero at the funnel walls. However, if the flow is turbulent and the boundary layer is thin enough, this is a reasonable approximation. Thanks from topsquark Tags bernoulli, law Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post Lalitha183 Differential Equations 2 September 11th, 2019 06:08 PM travis3335 Advanced Statistics 1 May 14th, 2013 09:04 PM William_33 Real Analysis 3 March 27th, 2013 03:27 AM r-soy Calculus 9 February 22nd, 2013 06:42 PM r-soy Calculus 2 February 21st, 2013 05:16 PM

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