On Tue, 22 Jul 2003, Randall Clague wrote:
> >there is a temperature at which it changes sign, the Joule-Thompson
> >inversion temperature. Above that temperature, the gas gets hotter, not
> >cooler, when expanded through an orifice.
>
> OK... What's the physical mechanism? Adiabatic cooling is
> straightforward: apply Boyle's Law. But why does passing through an
> orifice have any effect on gas temperature? Is it a sonic thing?
Alas, you've hit the limits of my background knowledge on this one -- I'd
have to go digging to sort out the theory. If dim memory serves, the J-T
coefficient is exactly zero for an ideal gas, so we're out in the messy
realm of non-ideal behavior.
Henry Spencer
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