<div dir="ltr"><div dir="auto">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.<br><br></div><div><b>Jason</b><br></div><div class="gmail_extra"><br><div class="gmail_quote">Le 8 févr. 2017 3:11 PM, "Olaf Baumann" <<a href="mailto:olabau@gmail.com" target="_blank">olabau@gmail.com</a>> a écrit :<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">I've just had an idea and I don't know if it would work.</div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)"><br></div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">I'm wondering if it is possible to circulate water in a closed system by just heating or cooling.</div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)"><br></div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">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.</div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)"><br></div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">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*.</div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)"><br></div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">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.</div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)"><br></div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">Probably a good idea to use some vinyl tubing instead so I don't ruin a perfectly good hula hoop.</div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)"><br></div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">-- </div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)">Olaf</div><div class="gmail_default" style="font-family:"courier new",monospace;color:rgb(51,51,255)"><br></div></div>
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