[Lab] pumping water with heat?

[Amos Hayes]

This is the thermosyphon example I have my eye on...

https://www.weltevree.nl/collection/dutchtub.html

--
Amos
amos at polkaroo.net

On 8 February 2017 at 17:34, Jason Arnold <arnold.jason at gmail.com> wrote:

> 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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