1146Re: Methyl hydrate wick burners to make steam.
- Aug 25, 2008--- In firstname.lastname@example.org, Donald Qualls
> darylcanada73 wrote:
> > I have been making and using these burners for my putt putts,
> > custom designed to fit a particular boat and motor. They are easyto
> > build and work well. An engine I just built required lots of heatin a
> > rather long and narrow shape so I built a burner using two 1"flat lamp
> > wicks side by side. Looked good and burned OK but it did notprovide
> > the heat I required. Replaced it with a burner I had at handusing
> > three 1/4" round wicks made in my usual way with cotton string inbrass
> > tubing. I was surprised to find that the three round wicks mademore
> > heat than the 2 inches of flat wick. Fuel consumption was highwith the
> > flat wicks.evaporating
> > Can any of you steam guys explain this?
> I expect the difference is related to how air mixes with the
> fuel in the flame. The flat wick will have a long area in whichthe air
> mixes in two-dimensionally, while a small round wick always mixesfor)
> three-dimensionally; that means the larger wick burns with a taller
> flame (better for illumination, which is what flat wicks were made
> and, in a tight installation, may have been quenching the flameagainst
> the metal of the boiler. The extra fuel consumption was probablyeither
> burning off after the vapors had left the active area of the boileror
> simply being lost unburned (the latter you should smell as a muchexcept
> greater alcohol odor compared to the three wick burner).
> Generally, if the flame contacts the boiler surface with anything
> the extreme tip (the part of a candle flame that's starting to getfaint
> as it rises, though this is much harder to see with the faint flameof
> alcohol), it's going to burn inefficiently and have both a lowerwant,
> transfer temperature and reduced total heat transfer.
> If, through hard work and perseverance, you finally get what you
> it's probably a sign you weren't dreaming big enough.http://silent1.home.netcom.com
> Donald Qualls, aka The Silent Observer
> Opinions expressed are my own -- take them for what they're worth
> and don't expect them to be perfect.
Thanks for the reply. I think that you have the right answer. The
problem was coincident to running boats in a (temporary)speed testing
pond I recently built in the carport. Outdoors, clipping along in the
breeze was cooling some boilers so I was using various forms of
cowling. In this case seems likely the cowling was too close and
blocked air flow and just made the problem worse. Along the way I
forgot that quality of flame is more important than quantity.
I appreciate the help. Daryl.
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