why do fluids come out of containers in waves?
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# why do fluids come out of containers in waves?

[From: ] [author: ] [Date: 17-04-16] [Hit: ]
This has been pissing me off for years. I try to make cereal in the morning or just get a glass of something, and when I expect a steady stream of liquid, I just get a *splosh splosh splosh* and it drops in and starts to splash absolutely everywhere, so I have to stop, and do it,......
why do fluids come out of containers in waves?
This has been pissing me off for years. I try to make cereal in the morning or just get a glass of something, and when I expect a steady stream of liquid, I just get a *splosh splosh splosh* and it drops in and starts to splash absolutely everywhere, so I have to stop, and do it, stop and repeat. It's the same...
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Jim Moor say: Chaos
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Philomel say: When fluid comes out of a container air must go in to replace the fluid.
You could place a hose into the container so the air can go in through the hose or you could pour more slowly so it doesn't cavitate. It's your choice.
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wereq say: you literally answered your own question. Don't pour so fast and the effect won't be so pronounced.
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oldprof say: Sploosh sploosh stems from the fact that as the liquid leaves the spigot it leaves behind a partial vacuum behind in the container. So there is a net force upward back into the container since the atm pressure is higher for a moment than the pressure behind the liquid in the container.

That slows the flow.

But then the atm pressure pushes up through the liquid and a bubble of air pops inside the container. So the backward force is reduced to zero since both atm pressure and the container pressure are the same.

And the flow speeds up with your sploosh.

That creates another partial vacuum inside and the cycle starts all over. So you have repeating sploosh sploosh ... sploosh...drip (all dry).
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Dixon say: When liquid flows out of a rigid container it has to be replaced by air flowing in. But if the liquid completely fills the mouth of the container there is no path for air to flow in smoothly, so there is a sort of stalemate where the liquid can't flow out smoothly because the air has no path to flow in smoothly. This is resolved by a "chunk" of liquid just falling off the end allowing a brief hole to open for a chunk of air to get in, before the mouth blocks up again.
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