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#159102 - 12/22/11 11:34 AM Re: Alcohol Stoves [Re: Hikin Jim]
BZH Offline
member

Registered: 01/26/11
Posts: 1108
Loc: Madison, AL
at low velocity, flow is smooth, with individual fluid particles flowing parallel to each other. At higher velocity flow becomes turbulent. In general the flow will still be in the same direction but there will be a small chaotic component. The interesting part is that the chaotic component (turbulence) often makes the flow more efficient.

To get really dorktastic... if you solve the Navier-Stokes equations (the equations that govern fluid dynamics) for a smooth geometry you will always get the laminar solution. You have to intentionally introduce a disturbance to get the turbulent solution. In terms of turbulence it is the small imperfections that really matter.

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#159107 - 12/22/11 12:50 PM Re: Alcohol Stoves [Re: BZH]
OregonMouse Online   content
member

Registered: 02/03/06
Posts: 6764
Loc: Gateway to Columbia Gorge
Are we supposed to understand what you're talking about? laugh
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#159114 - 12/22/11 01:28 PM Re: Alcohol Stoves [Re: BZH]
billstephenson Offline
Moderator

Registered: 02/07/07
Posts: 3917
Loc: Ozark Mountains in SW Missouri
Quote:
The interesting part is that the chaotic component (turbulence) often makes the flow more efficient.


Does it also make the conversion to heat more efficient when the gas is burned?

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#159120 - 12/22/11 02:06 PM Re: Alcohol Stoves [Re: billstephenson]
BZH Offline
member

Registered: 01/26/11
Posts: 1108
Loc: Madison, AL
Originally Posted By OregonMouse
Are we supposed to understand what you're talking about? laugh


No! That's why I get paid so well smile

Originally Posted By billstephenson
Quote:
The interesting part is that the chaotic component (turbulence) often makes the flow more efficient.


Does it also make the conversion to heat more efficient when the gas is burned?



Yes! turbulence increases mixing which gets more components of the reaction closer together. It allows for more complete combustion.

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#159127 - 12/22/11 04:14 PM Re: Alcohol Stoves [Re: BZH]
TomD Offline
Moderator

Registered: 10/30/03
Posts: 4963
Loc: Marina del Rey,CA
Since you are in RB, sounds like you are working at Boeing. Either that or designing surfboards. grin
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#159129 - 12/22/11 04:19 PM Re: Alcohol Stoves [Re: BZH]
billstephenson Offline
Moderator

Registered: 02/07/07
Posts: 3917
Loc: Ozark Mountains in SW Missouri
Well that make sense to me, and that "Tornado Wick Jet Alcohol Stove" is pretty darn cool too. The video showing how to make was especially cool. The tubing bending trick using sand was awesome, and so was his can cutter.

Thanks for sharing that!
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#159134 - 12/22/11 05:20 PM Re: Alcohol Stoves [Re: TomD]
BZH Offline
member

Registered: 01/26/11
Posts: 1108
Loc: Madison, AL
I work at The Aerospace Corp... I tell the Air-force if what Boeing (actually ULA.. 50% Boeing/50% Lockheed-Martin) is planning to do will actually work.

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#159142 - 12/22/11 06:31 PM Re: Alcohol Stoves [Re: BZH]
TomD Offline
Moderator

Registered: 10/30/03
Posts: 4963
Loc: Marina del Rey,CA
I figure it had to be something along those lines. A friend of mine used to work for Boeing on the Space Shuttle project. She wasn't an engineer, an accountant or something like that, I think. I also know a couple of people who work for aerospace companies in El Segundo.
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#159156 - 12/22/11 09:55 PM Re: Alcohol Stoves [Re: HeikeDog]
Rayman1968 Offline
member

Registered: 06/12/10
Posts: 30
Loc: Ventura, CA.
I take beano to help with my laminar solution.

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#159278 - 12/27/11 11:12 AM Re: Alcohol Stoves [Re: Rayman1968]
HeikeDog Offline
member

Registered: 12/07/11
Posts: 19
Loc: South Texas
Thanks for the great discussion, folks! I ended up going ith the MSR pocket rocket, and my 16yo son thinks it's the greatest thing since sliced bread!

Lesley

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#159372 - 12/30/11 06:13 PM Re: Alcohol Stoves [Re: HeikeDog]
PappyBanjo Offline
member

Registered: 12/16/11
Posts: 20
Loc: Maryland
My new alchy stove made from Miller Lite aluminum bottles got its first field test on Wednesday. I used it to warm up a can of beans on a day hike with an inch of snow on the ground, gusting winds, in 27 degrees F, at 3200 ft. It took more time to prime than at home, and I doubt it would have made water hot enough for pasta, but I call that a successful test in extreme conditions.

At home, it bings water to a full boil within 4 minutes of lighting it.
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"Just enough to stay warm, dry, hydrated, and fed."

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#159384 - 12/31/11 02:11 PM Re: Alcohol Stoves [Re: PappyBanjo]
Rayman1968 Offline
member

Registered: 06/12/10
Posts: 30
Loc: Ventura, CA.
I've wanted to make a stove from one of these 'aluminum bottles' as well, but they are no where to be found where I live.

I talked to a guy who owns a liquor store near me and he had no idea what I was talking about. I guess they just don't sell them on the west coast.

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#159388 - 12/31/11 04:19 PM Re: Alcohol Stoves [Re: Rayman1968]
lori Offline
member

Registered: 01/22/08
Posts: 2801
Sure they do. I've seen them in the mini marts, filled with soda and beer of various kinds.
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http://hikeandbackpack.com

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#159391 - 12/31/11 06:14 PM Re: Alcohol Stoves [Re: lori]
Rayman1968 Offline
member

Registered: 06/12/10
Posts: 30
Loc: Ventura, CA.
I can not find them any where here in Ventura. I've looked in grocery stores, liquor stores, 7-11, etc...

Also looked all over Simi Valley when I worked there. Nothing.

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#159392 - 12/31/11 07:09 PM Re: Alcohol Stoves [Re: Rayman1968]
lori Offline
member

Registered: 01/22/08
Posts: 2801
_________________________
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzuki

http://hikeandbackpack.com

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