[SEL] Thermo-syphon Question

[Skip Cleveland]

I got an idea. The thermosiphoning was applied to any old thing that 
circulated fluids by the addition of heat. Thermocycling might have been a 
better term for some applications. In my search for thermowhatever all I 
could find was solar water heating systems. They sound like what you guys 
are talking about.
Thermocycling is what happens to your brains when cycling in the hot sun.
Skip
----- Original Message ----- 
From: "John Culp" <johnculp at chartertn.net>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Saturday, January 20, 2007 1:31 PM
Subject: Re: [SEL] Thermo-syphon Question


>> I found this on google. Doesn't say anything about the water having to be 
>> above either radiator or tank opening. Could this be wrong?
>
> Of course it could. It's not, though, just incomplete. What they're not 
> mentioning, taking it as a given, is that there must be a complete circuit 
> for the flow to occur, just as with a DC electrical circuit.
>
> Let a large enough air bubble into the system to open the liquid circuit, 
> and thermosiphoning can't occur. Percolation driven by rising steam 
> bubbles still can. Remember the old fashioned coffee percolators?
>
> The heat input to a thermosiphoning system doesn't have to be at the 
> bottom, or the cooling at the top, for convection to occur. It just needs 
> to be asymmetrical so that one side of the system contains warmer liquid 
> than the other. That liquid's less dense than the cool liquid in the other 
> line, so it will rise and be displaced by the cooler liquid, that then is 
> heated.
>
> John Culp
> Bristol, Tennessee, USA
>
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