Abstract
Helium was condensed on the wall of a vertical copper tube (14 mm in diameter, 32 mm long) in the experimental range: vapour temperature in the tube − 4.1–5.0 K; heat flux − 0.5–86 mW cm −2; temperature differences across a liquid film − 0.01–1.3 K ;film Reynolds numbers − 3–380. It was found that the heat flux increased linearly with the film temperature difference, yielding a constant heat transfer coefficient of about 0.065 W cm −2 K −1. The discrepancy between the experimental results and the laminar condensation theory is also considered.
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