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This paper deals with the triggering mechanism of the boiling crisis, atransition from nucleate to film boiling. We observe the boiling crisis in poolsaturated boiling experimentally at nearly critical pressure to take advantageof the slowness of the bubble growth and of the smallness of the Critical HeatFlux (CHF) that defines the transition point. Such experiments require thereduced gravity conditions. Close to the CHF, the slow growth of the individualdry spots and their subsequent fusion on the transparent heater are observedthrough the latter. As discussed in the paper, these observations areconsistent with numerical results obtained with the vapor recoil model of theboiling crisis.

Is CHF triggered by the vapor recoil effect?