Abstract
Vapour bubble growth, bubble departure and stability of vapour nuclei were studied in liquid nitrogen and hydrogen. Heat-transfer surfaces with artificial nucleation sites were produced. The cavities had mouth diameters ranging from 27 to 70 μm. Bubble growth was recorded with a high-speed camera. Experimental results were compared with theory. In re-entrant cavities stable vapour nuclei may exist at a range of superheat greater than that in cylindrical cavities.
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