Abstract
Nitrogen pool boiling on a structured surface coated with an organic fibre net insulation in a narrow channel was studied experimentally. The samples tested were elements of the copper stabilizer of a high-current superconducting cable. All the experimental conditions were close to the real winding operation ones. Two types of net surface insulation were studied for both the narrow rectangular cross-sectional channel (the channel width varied within the range of 7–17 mm) and for the surface free of peripheral elements. The maximum power reached before the boiling mode change was found to be two times lower for the dense type of the insulation than for the smooth surface of similar design. For the insulation with a more rarefied structure there are two stationary pool boiling modes. Changing these modes was accompanied by transition processes of different duration with a single temperature pulse at an amplitude up to 110 K. Critical heat flux in this case can significantly exceed the smooth surface one but at very high wall superheat only.
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