All Questions
Tagged with collision fluid-dynamics
36
questions
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Generated pressure when two water interfaces collide
Background
I'm studying a bulk cavitaion problem as described in V. J. Cushing - On the theory of bulk cavitation. In the problem an incident shock wave (from the water $z < 0$) is reflected as a ...
- 13
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27
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Impact of object on liquid
When something drops into water, the dynamics related are complicated. I was wondering if there are some well-written papers/books about fluid dynamics that investigate in this specifically.
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104
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How are bubbles formed when a raindrop hits a flat pool of water?
I have noticed that raindrop impact can create a bubble on the surface of the water in a hot tub (104°F) up to several centimeters in diameter that is stable for several seconds before bursting.
The ...
- 2,270
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How to modify kinetic gas theory to work for macroscopic particles? (2D)
For the first time I framed a question on my own when I was recently playing carrom pool with my cousin and a striking thought ran across my mind!
I was thinking if a square frame is fixed rigidly on ...
3
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140
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Are the force frequencies the same in the discrete and continuous case?
Let's say I have an ideal gas of particles and the strike zone of area $\sigma=\pi d^2$ of a molecule of the molecule is what is the sub system considered. The end of the face of the cylinder is the ...
- 1,389
1
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2
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73
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Why do puddles of coffee sludge have spikes over its perimeter at regular intervals?
After I finished my coffee, I by mistake dropped my cup on the floor. The sludge as it dropped, painted circles with little spikes in gaps over it perimeter:
Why do these spikes come in (mostly) ...
- 7,980
1
vote
0
answers
64
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Force of water hitting a wall ( if rebounds)
I've seen many question about water hitting a wall perpendicularly and doesn't rebound then force exerted on wall is F=ρΑv2
But what if the water rebounds ?
How will the solution be ?
Someone pls ...
- 11
1
vote
1
answer
117
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By what mechanism is a Worthington jet generated when a hydrophilic sphere impacts a body of water?
In this video
(https://m.youtube.com/watch?v=yblbsylowkY&feature=youtu.be), the impacts of a hydrophilic and a hydrophobic sphere into water are compared, showing two different Worthington jets ...
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38
votes
13
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If water is nearly as incompressible as ground, why don't divers get injured when they plunge into it?
I have read that water (or any other liquid) cannot be compressed like gases and it is nearly as elastic as solid. So why isn’t the impact of diving into water equivalent to that of diving on hard ...
- 515
4
votes
1
answer
230
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Clapping-like sound from large planar object hitting a surface
I am trying to understand the behavior of air when a large, planar object hits a parallel surface at a high velocity, thus forcing the initially static air outwards, and creating a sound wave. This is ...
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4
votes
1
answer
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How fast do I need to go to run on water? [duplicate]
Well I was reading this article and I got stuck in this particular line
because according to my calculations, the reaction of on my foot by the water should be $\rho A v^2 \sin^2\theta$. I am ...
- 608
17
votes
5
answers
4k
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Does a slowed down version of small stone falling in water look the same as a big rock falling in real time?
I was wondering: If you let a small stone drop on a body of water, record it on film, and replay the scene in slow motion, will it be possible to see the difference with a huge rock that falls, in ...
2
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0
answers
27
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What is the relation between a object and the height of the water splash? [duplicate]
I did some experiment between the mass of an object and the height of the water splash, the experiment is dropping a sphere object with a different mass increase by 25g, I did 4 different variables ...
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1
vote
5
answers
899
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How does a water jet hitting a wall move parallel to the wall if momentum is conserved?
Classical mechanics says that if I throw a ball with velocity perpendicular to the wall and it collides elastically with the wall with a velocity $v_0$, then it bounces back with the same velocity $...
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3
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Mean free path equation derivation
I was reading about mean free path equation derivation online and stumbled upon this:
We will derive the equation using the following assumptions: let’s assume that the molecule is spherical, and the ...
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