Venturi question
- From: matt271829-news@xxxxxxxxxxx
- Date: 11 Sep 2006 13:02:53 -0700
Hi
It seems to be a well-established fact that the temperature drops
inside a venturi tube (e.g. causing icing in carburettors). The only
explanation I've been able to find is that "the expansion of fluid as
it passes the throat causes a temperature decrease". I'm not sure what
"passes" means here. The pressure inside the throat is lower than the
pressure either side, right? So does that mean that the gas expands as
it enters the throat and that is what causes cooling?
Another thing that's confusing me is that none of the
conservation-of-energy explanations of the Bernoulli effect that I've
come across seem to make any reference to this temperature change. They
seem to assume that the gas's temperature is constant as far as I can
tell (though I could be wrong). Is the temperature change a natural
consequence of the analysis of the Bernoulli effect (in some way I
don't understand), or is it a separate phenomenon that these
explanations ignore for the sake of simplicity?
Can anyone explain, in terms of the basic principles (rather than
necessarily the detailed maths), exactly what's going on and why this
cooling occurs?
Thanks!
.
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