| harry k 2005-09-21, 11:21 pm |
|
Derek Broughton wrote:
> Ecnerwal wrote:
>
>
> If it's so basic, how did you get it wrong?
>
>
> A 50' tube wouldn't be close to enough. Since theoretically, with a vacuum,
> you can raise the water lever ~34', you need to have at least ~70' of hose.
> Say 34.5' _up_, 34.5' _back down_ and another foot below that. You, might,
> in fact, demonstrate that you couldn't lift it that much, but you wouldn't
> have proved why.
>
>
> You're addressing the wrong problem. _Everybody_ knows that you can't lift
> water higher by suction. The question is whether a siphon is the same.
>
> For the record, I've changed my mind. Google's a wonderful thing and
> "syphon height" returns an excellent Wikipedia reference.
>
>
> It's hardly the same situation. Water can generally be made to flow fast
> enough to carry bubbles with it. I have enough trouble siphoning beer into
> bottles with a 0.5 meter lift - but the trick is always to keep it moving
> fast enough.
> --
> derek
I was ready to agree with Ecnerwal until this. Originally I was
looking at it as not having a 34 ft limit as both the up and down legs
are water filled thus as the down leg drops it just pulls water over
the top. But then...
As for the wikipedia ref. Could you post a URL for it? I tried google
with "siphon height" and got to usual inundation of cites. Couldn't
locate the Wikipedia one.
Harry K
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