Poul-Henning Kamp wrote:
In message <[email protected]>, Bruce Griffiths writes:
Indicates that the operating pressure at the hydrogen dissociator is
likely to be a few Torr or so.
The pressure is basically: "As low as possible" in order to minimize
hydrogen collisions (other hydrogen, walls) as much as possible.
A few torr is actually not a particularly high vacuum (e.g. your run of
the mill neon sign is pumped down a lot lower before being filled to a
few torr).
PHKs comment implies you're looking for mean free path somewhat greater
than physical dimensions...
That would imply pressures less than a micron (0.001 Torr).. MFP =
5E-3/P with P in Torr.. 1 micron pressure == 5cm MFP
The other thing is when you're looking at MFP comparable to dimensions,
you're looking at molecular pumping in some form (no more pistons or
rotary vanes or ...)
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