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BOILING CRISIS DYNAMICS : LOW GRAVITY EXPERIMENTS AND MODELING

To understand the boiling crisis mechanism, one needs to slow it down experimentally. One can take advantage of the strong drop of thermal diffusivity near the liquidvapor critical point that leads to the slowing down of boiling. We report here two kinds of low gravity saturated boiling experiments performed in the vicinity of the liquid vapor critical point. First, we discuss experiments carried out on board of the International space station in the DECLIC apparatus with SF6 fluid at 46◦C. Second, the experiments conducted in a ground-based magnetic gravity compensation installation at Grenoble with H2 at 33 K. We compare both kinds of experiments and show their complementarity. During observations through a transparent heater made with a metal oxide film, where the dry spots are visualized. We evidence two regimes of growth of the dry spots under the vapor bubbles: the regime of circular dry spots and chain coalescence of dry spots.