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The thermal penetration depth, δz ≡ (4DTt)1/2, and the transient pressure drop ΔP associated with the cooling caused by one pumping cycle, during which the sample tube is opened to an evacuated manifold of volume V2. The calculation used Eq. (9), Eq. (10), and the values for liquid naphthalene at 80 °C (Table 2).
| t(s) | δz (mm) | ΔP/PV |
|---|---|---|
| 1 | 0.05 | 0.14 |
| 10 | 1.5 | 0.04 |
| 100 | 4.7 | 0.014 |
