[Diy_efi] WI, methanol, and corrosion

[Dave Dahlgren]

I think as the delta t goes down from initial vaporization it will get slower
and slower.... Less energy to get the job done in the available time.. It is a
classic case of diminishing returns for the time available. I think the more you
put in the less difference it makes in the end. The first 50% got most of work
done the last 50% is probably liquid, and the charge air temp is still very hot
but has liquid water with it. If it is hard to vaporize all the fuel how can you
expect to vaporize all the water?? with vastly different boiling points to boot!
Dave

Greg Hermann wrote:
> 
> At 5:55 AM 1/24/03, Dave Dahlgren wrote:
> >How long does this phase change take?
> 
> ALL depends on how thoroughly atomized the water is. Evaporation rate is a
> function of surface area to weight or volume.
> 
> I expect I could apply your lack of time argument to the evaporation of the
> fuel (particularly if running methanol) and likely prove that the engine
> couldn't possibly run because the fuel doesn't have time to evaporate-- in
> fact, this may be touching on why alky fueled engines need to be run so
> much richer than stoich !! Likely also gets into some of the why of Honda
> F-1 engines that pre-heated (mostly toluol) fuel.
> 
> If there is heat available, and lots of surface area, and the surrounding
> gas is not saturated with respect to the vapor of the liquid which is
> evaporating  (at the ambient temp), then evaporation is a FAST process.
> 
> Greg


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