Pages 417-418
The phenomena of natural convection boiling on the outer surface of a heated hemispherical vessel surrounded by a thermal insulation structure were investigated experimentally in the subscale test facility that modeled shapes of the reactor vessel and the structure surrounding the reactor vessel in the domestic PWR. The objective were to measure the rate of boiling heat transfer, to observe the behavior of the boiling-induced two-phase motion in the annular channel formed between the hemispherical vessel and the insulation structure. Measurements of the local boiling heat fluxes and the local wall superheats showed a spatial variation of the nucleate boiling heat transfer.
