[Lab] pumping water with heat?

[Jason Arnold]

Yep, absolutely possible to move fluid with a temperature gradient - Google
"thermosyphon". Basically: localized heat causes expansion, which causes
pressure, which causes flow. A buddy of mine in college built a sweet
example using a 2 gallon glass jug filled with water and a carefully bent
up serpentine of copper tubing which he routed under his Macbook - BAM,
free laptop cooling.

*Jason*

Le 8 févr. 2017 3:11 PM, "Olaf Baumann" <olabau at gmail.com> a écrit :

> I've just had an idea and I don't know if it would work.
>
> I'm wondering if it is possible to circulate water in a closed system by
> just heating or cooling.
>
> Imagine a hula hoop standing vertically and filled with water.  If I apply
> heat at the 3 o'clock position, would the water flow counter clockwise?
> Then cool that same region to make it flow clockwise.
>
> Part of me thinks that it's too simple of a contraption to work but I
> can't think of any reason why it wouldn't.  Of course the 'pressure' or
> flow would be quite small and I'd have to keep the temperature safely
> between freezing and boiling to avoid ice jams and *explosions*.
>
> Then I can cut at 7 and 11 o'clock and add a long hose that I can wrap
> around my beer fermentation vessel inside of some insulation.  Add a
> peltier effect heater/cooler at 3 o'clock along with a PID and thermometer
> and I'd have a way to brew my beer with tightly controlled temperatures.
> Target temperatures would be between 10°C and 25°C with a range one or two
> degrees.
>
> Probably a good idea to use some vinyl tubing instead so I don't ruin a
> perfectly good hula hoop.
>
> --
> Olaf
>
>
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