All Questions
Tagged with everyday-life flow
45
questions
6
votes
1
answer
127
views
Why do jet engine vortices go toward the ground?
This image was shown to us to illustrate how a tornado forms due to a low pressure region (also see Jet engine vortices).
I find it odd that the tornado always ends up at the ground, where it is a ...
- 12.5k
1
vote
1
answer
44
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Why are water bubbles created at the top of the bottle if the water level is higher?
Water bubbles created at the top of the bottle if the water level is higher:
but water bubbles is not created at the top of the bottle if the water level is lower:
This question is very different ...
- 113
4
votes
1
answer
512
views
Sloshing water coming to rest?
Something I've noticed is that when I jostle a glass of water, the water inside will start sloshing back and forth. Gradually, the water comes to rest. However, if I move the glass (i.e., translate it)...
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18
votes
4
answers
5k
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Why do water particles appear to be exiting a stream of water from a faucet, instead of the stream being held together by surface tension?
I recently noticed an interesting phenomenon while watching the tap running in my kitchen. At the time, there was bright sunlight coming in the kitchen window. As the stream was running out of the tap ...
- 319
0
votes
1
answer
29
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Will hot object near ceiling vent create more draft? [closed]
As in the picture, we have a room with vents at the bottom to let cold air in and at the top to let hot air out. Normally the air flow is limited by the temperature gradient (correct me if I'm wrong). ...
- 340
1
vote
0
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Airflow between two rooms (one hot, one cold) [closed]
Scenario —
It is night time and somewhat cold outside.
Room 1 (Bedroom): The window is slightly creaked open. I have a space heater going on continually heating room 1. One door is closed to the ...
6
votes
1
answer
1k
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How does a bottle pour its contents?
Consider this soy sauce bottle:
The cap has two holes that are directly opposite to one another. Covering one hole, I find the soy sauce almost doesn't pour at all.
However, consider a bottle with a ...
- 318
8
votes
1
answer
140
views
Estimating the Characteristic Time of Spinning Tea
Suppose I have a cup of tea and stir it so it gains some angular velocity $\omega_0$. Could you estimate the characteristic time $\tau$ it takes for the tea to stop rotating (or to lose half its ...
- 1,281
0
votes
1
answer
130
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Why does hot water shoot out of my reusable coffee cup when I invert it during cleaning?
In an effort to keep my reusable coffee cup clean, before washing it I rinse it out and half fill it with near-boiling hot water (from an instant hot water tap at work), and invert it aimed at the ...
- 530
0
votes
0
answers
35
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Why do we feel cool after switching fan? [duplicate]
Please see that my actual question is not similar to this: Why do we feel cool when we turn our fans on?
Suppose I switched my fan on. The air particles start moving. Since, their kinetic energy ...
user326901
1
vote
0
answers
72
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Why does the shape of water flowing down from a squared orifice looks like a chain?
Hello I'm a high school student in Taiwan. My classmate and I are doing a project about the shape of water flowing down from a squared orifice, something like this video.
We wanna know is there a ...
- 11
1
vote
1
answer
134
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Warm air syphon to cool down greenhouse
I'm thinking about a very energy efficient way of controlling temperature inside a greenhouse when it's too hot.
The goal is to use the syphon effect in order to draw hot air from the top of the ...
- 11
14
votes
12
answers
6k
views
Direction of water through a pipe
I was recently asked this following interesting question:
How can you find what is the direction of the water flow inside a horizontal pipe, given the pipe is not transparent?
You can assume the ...
- 165
1
vote
1
answer
126
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Kelvin's Circulation theorem
Recently, I dipped my spoon into my tea. I saw that as I dipped my spoon into my tea, two vortices formed at both edges of the spoon. I guess this is similar to vortices forming at the end of ...
- 13
1
vote
1
answer
43
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What is this liquid flow behavior called?
Every morning, when I take a clean, dry metal tumbler and fill it with hot coffee, the first sip is always different than the rest that follow.
The first sip requires some coaxing, for me to tip the ...
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