15. Pre-emptying time. Pressure drop

Up to 1 or 10 Pa, as long as no outgassing occurs, the formula can be used: $t = \frac{V}{q_{ν}} \ln \frac{p_{0}}{p}$

with p ₀ = 1.013 × 10 ⁵ Pa.

The diagram in figure 13 shows the pre-evacuation time, from atmospheric pressure, of an enclosure of given volume pumped by a system with a known flow rate.

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References

(1) - ROTH (A.) - Vacuum technology. - 1 ^er éd. Amsterdam, North-Holland Publishing Company (1976).
(2) - DUSHMAN (S.), LAFFERTY (J.M.) - Scientific foundations of vacuum technique. - 806 p., 2e...

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