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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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.
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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. :)
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.
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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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It was a good few months old IMO. I didn't think it would be that drinkable. :)
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.
To misquote George Banks: "... rendering the beer undrinkable, even by Americans."
You'll never get very far if all you do is follow instructions.
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It was a good few months old IMO. I didn't think it would be that drinkable. :)
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You could have Nagy do a taste test.
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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.
not at all, only to put the thumb in its ass for serving it... "A flute of champagne must be filled with elegance! As well as the opening of the bottle, Champagne service has its ritual which contributes to the pleasure of the guests. To be paid, the Champagne bottle can be held in the Middle full hand (as is done for other wines). It is also very convenient, especially for the magnums, grasp the bottom of the bottle, right hand thumb introduced in flare and other fingers stretched under the base of the Bole, the other hand gently supporting the neck." Exactly what I say shortly! :-\ http://www.maisons-champagne.com/encyclopedie/vignes_au_plaisir/servir_champagne.htm[^]
entia non sunt multiplicanda praeter necessitatem
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not at all, only to put the thumb in its ass for serving it... "A flute of champagne must be filled with elegance! As well as the opening of the bottle, Champagne service has its ritual which contributes to the pleasure of the guests. To be paid, the Champagne bottle can be held in the Middle full hand (as is done for other wines). It is also very convenient, especially for the magnums, grasp the bottom of the bottle, right hand thumb introduced in flare and other fingers stretched under the base of the Bole, the other hand gently supporting the neck." Exactly what I say shortly! :-\ http://www.maisons-champagne.com/encyclopedie/vignes_au_plaisir/servir_champagne.htm[^]
entia non sunt multiplicanda praeter necessitatem
Very nice!
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?
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I'll take a stab. The bottle has less drag falling sideways (smooth shape) than it does with the bottom first (square shape). Dave.
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I'll take a stab. The bottle has less drag falling sideways (smooth shape) than it does with the bottom first (square shape). Dave.
It must have. What is odd is that there is so much less drag despite the massive increase in frontal are when falling sideways. I wish I could find a pic of a bottle falling in air, from a great height, to see what attitude it adopts. It might indicate an effect of boundary layer flow is playing a part.
Sign a petition calling for the boycott of Israel until it returns to its legal 1967 borders.