[DIYbio] titanium: "boils water definitely twice faster then any Al cups" -- can it be?

On 02/15/2016 07:57 AM, Alex D wrote:
> t it boils water definitely twice faster then any Al cups ive had.
>
> anyone can clarify on that?

It is probably because of the extreme thinness of the strong Ti sheet the pan is made of.
So you can probably see the flame pattern in the boiling on the pans bottom -- very little heat spreading, mostly flowing through
the thin sheet and transferring to the liquid.

Pan thinness of Ti pans is usually about 1/2 that of aluminum that I have seen. And conductivity is 10X different Ti less than
Al. The thinness is not all of it. The fire is much hotter than boiling is another thing. Even though the conductivity of a
half as thick ti pan might be 5X less than aluminum, there is still plenty of temperature difference to get heat flowing to
the boiling water. Maybe the formation of hot spots helps speed the boil? Hot spots would be causing early boiling that stirs
the water well and speeds heat up. Could the thicker aluminum pan be so much more even that laminar layers of hot/warm/cool water
form from the bottom up in the pan without stirring much for a several minutes, while the Ti pan is already stirring like mad
because of one spot boiling early?

I've seen a neato product for camping called a turbo rocket boil something that advantages Titanium. It has insulating sleeve
around a shell separated by corrugated metal from an inner pot such that the flow of propane flames goes along the sides of the
boiling pot effectively. That pot boiler has a vertical shape, compact, protected from dings by having the two layers. I bet its
inner pot is really thin and that is its trick.

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