Fluid Dynamics: quickest way to pour water out of a bottle

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SUMMARY

The quickest way to pour water out of a bottle involves using a bendy straw, known as the "strawpedo" method, which equalizes pressure and accelerates water flow. Additionally, creating a vortex by swirling the bottle significantly enhances the pouring speed. Demonstrations using Perrier bottles have shown that swirling effectively maximizes water discharge. Understanding these techniques is crucial for optimizing fluid dynamics in practical applications.

PREREQUISITES
  • Basic understanding of fluid dynamics principles
  • Familiarity with pressure differentials
  • Knowledge of vortex formation in liquids
  • Experience with experimental design and observation
NEXT STEPS
  • Research the physics of fluid dynamics in "Introduction to Fluid Mechanics" textbooks
  • Explore the effects of pressure differentials on fluid flow using Bernoulli's principle
  • Investigate vortex formation techniques in liquids through practical experiments
  • Examine the impact of bottle neck sizes on pouring efficiency in various container designs
USEFUL FOR

This discussion is beneficial for students in physics or engineering, fluid dynamics researchers, and anyone interested in optimizing liquid transfer methods in practical scenarios.

blondnc
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I am doing a 4000 word essay on the quickest way to pour water out of a bottle and i need some help with the theory and formulas etc. I've tried looking but this experiment isn't well documented so any help would be great!
 
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Well, from experience, the strawpedo works pretty well. If you stick a bendy straw in the bottle, it will come out a lot faster.

I think this is because it equalises pressure in the bottle. Otherwise, there is a lower pressure which causes the water to slow down.

Hopefully someone can give you a better answer.
 
The "how" answer is to swirl the bottle so that a vortex forms a funnel allowing air up to the bottom of the bottle. When I have seen it demonstrated, in the lecture that you may have missed, it was done with two perrier bottles, I am not sure that was to maximise the effectiveness of the demonstration but it was very noticible that the "swirled" bottle emptied quickest.
 
im aware at botht but i wanted to focus on it without using extra apparatus etc to look at angles and relationships between neck sizes
 

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