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# Fluids and Oscillations

Can anyone prove the oscillation of a fluid in a U-tube or a bent V tube is a SHM for small displacements using Bernoulli's theorem?

Help!!

Note by Abhi Kumbale
1 year, 2 months ago

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If you recall, Bernoulli's equation assumes steady state fluid flow. Since the fluid oscillating in the U-tube is changing direction, there's no steady flow. There's also damping and turbulence. Long story short, Bernoulli's equation does not apply here.

Staff - 1 year, 2 months ago

If we assume there is no damping can we apply it then?

- 1 year, 2 months ago

As long as the flow isn't steady Bernoulli's equation isn't valid.

Staff - 1 year, 2 months ago

Got it. Thanks.

- 1 year, 2 months ago

I remembered this video. Walter Lewin does a demo with the liquid as well as the calculation. (timestamp starts at the demo, calculation is a little bit before.

Staff - 1 year, 2 months ago

Comment deleted Nov 23, 2016

?

- 1 year, 2 months ago

Now, it is okay. Is it necessary to use Bernoulli's theorem? you can prove much more easily without using that.

- 1 year, 2 months ago

I know how to prove without it. I wanted a proof using Bernoulli's theorem which makes this more interesting.

- 1 year, 2 months ago

Okay, then I think I should delete this comment. Because it is not the required answer. :)

- 1 year, 2 months ago

@Josh Silverman @Aniket Sanghi @Deepanshu Gupta @Nishant Rai @Rohith M.Athreya @Swapnil Das

- 1 year, 2 months ago