Question for the fluid dynamicists here
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I was snorkelling at the weekend and saw a bottle of beer on the sea bed with the top on, I went down to have a look and sure enough, it did. I let it drop back to the sea bed, vertically, neck up, expecting it to hold that position the entire way, but it didn't, it turned sideways, and fell the entire distance sideways, straight down, without any wobble, or instability. Wow I thought, a bottle of beer, falling through water, has LESS drag falling sideways then length ways? I was surprised. Can anyone suggest a reason why this should be?
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I was snorkelling at the weekend and saw a bottle of beer on the sea bed with the top on, I went down to have a look and sure enough, it did. I let it drop back to the sea bed, vertically, neck up, expecting it to hold that position the entire way, but it didn't, it turned sideways, and fell the entire distance sideways, straight down, without any wobble, or instability. Wow I thought, a bottle of beer, falling through water, has LESS drag falling sideways then length ways? I was surprised. Can anyone suggest a reason why this should be?
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The base is concaved so it must turn from there.
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I was snorkelling at the weekend and saw a bottle of beer on the sea bed with the top on, I went down to have a look and sure enough, it did. I let it drop back to the sea bed, vertically, neck up, expecting it to hold that position the entire way, but it didn't, it turned sideways, and fell the entire distance sideways, straight down, without any wobble, or instability. Wow I thought, a bottle of beer, falling through water, has LESS drag falling sideways then length ways? I was surprised. Can anyone suggest a reason why this should be?
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The base is concaved so it must turn from there.
I though you were on Hols...
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The flat bottom will create drag. the rounded sides will allow smooth transition of fluid round the object providing stability......but that is just my guess!
I think that since the flow is laminar, and not turbulent, you are probably right. If it were turbulent, it would adopt a tear drop shape, water falling through air, which would be most closely be approximated by it falling end on.
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I though you were on Hols...
I am. The girls are shopping and I am waiting. In a bar. With wifi. There may, or may not, be a champion's breakfast beside me. :beer:
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I am. The girls are shopping and I am waiting. In a bar. With wifi. There may, or may not, be a champion's breakfast beside me. :beer:
Lucky *****! :)
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The base is concaved so it must turn from there.
Reminds me of a discussion (argument) which may have happened in real life or perhaps even here. Why do Champagne bottles (except Cristal) have concave bases? A. For strength B. For stacking C. To make the bottle appear bigger Genuine question, I can't remember the answer.
Regards, Rob Philpott.
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I was snorkelling at the weekend and saw a bottle of beer on the sea bed with the top on, I went down to have a look and sure enough, it did. I let it drop back to the sea bed, vertically, neck up, expecting it to hold that position the entire way, but it didn't, it turned sideways, and fell the entire distance sideways, straight down, without any wobble, or instability. Wow I thought, a bottle of beer, falling through water, has LESS drag falling sideways then length ways? I was surprised. Can anyone suggest a reason why this should be?
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.
Munchies_Matt wrote:
Wow I thought, a bottle of beer, falling through water, has LESS drag falling sideways then length ways?
Yes - as the bottle has a circular cross section - fluid flow round circles is pretty efficient, despite the larger presenented surface area in the direction of travel.
Alberto Brandolini:
The amount of energy necessary to refute bullshit is an order of magnitude bigger than to produce it.
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Reminds me of a discussion (argument) which may have happened in real life or perhaps even here. Why do Champagne bottles (except Cristal) have concave bases? A. For strength B. For stacking C. To make the bottle appear bigger Genuine question, I can't remember the answer.
Regards, Rob Philpott.
Strength. A concave surface is stronger than a flat one.
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Strength. A concave surface is stronger than a flat one.
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.
IIRC it was invented by the British to stop French sparking wine (ie champers) from exploding
You cant outrun the world, but there is no harm in getting a head start Real stupidity beats artificial intelligence every time.
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IIRC it was invented by the British to stop French sparking wine (ie champers) from exploding
You cant outrun the world, but there is no harm in getting a head start Real stupidity beats artificial intelligence every time.
Don't know who invented it, but it is for strength reasons.
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.
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Don't know who invented it, but it is for strength reasons.
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.
it is, the concave bottom allows the contents to be under higher pressure, the original problem was the wine bottles if disturbed blew the bottom of the bottle off, not a good idea if you export wine
You cant outrun the world, but there is no harm in getting a head start Real stupidity beats artificial intelligence every time.
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I though you were on Hols...
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someone asked a question with the word 'beer' in it - Nagy receives automatic alerts for any booze-related posts ...
PooperPig - Coming Soon
Ahh, that explains it a sort of :beer:+:bob: alert...
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Ahh, that explains it a sort of :beer:+:bob: alert...
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Ahh, that explains it a sort of :beer:+:bob: alert...
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Oh! Sorry - sor the email and not the post - I see you did a bob - I thought you wrote the word alien - if you see what I mean!
PooperPig - Coming Soon
No worries!:cool:
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I was snorkelling at the weekend and saw a bottle of beer on the sea bed with the top on, I went down to have a look and sure enough, it did. I let it drop back to the sea bed, vertically, neck up, expecting it to hold that position the entire way, but it didn't, it turned sideways, and fell the entire distance sideways, straight down, without any wobble, or instability. Wow I thought, a bottle of beer, falling through water, has LESS drag falling sideways then length ways? I was surprised. Can anyone suggest a reason why this should be?
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.
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What I can't figure out and what suprises me is the fact you left the bottle of beer behind :doh:
It was a good few months old IMO. I didn't think it would be that drinkable. :)
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