Is CHF triggered by the vapor recoil effect?

Details Is CHF triggered by the vapor recoil effect? Is CHF triggered by the vapor recoil effect?

2007-07-20

arxiv.org/abs/0707.3009v1

Proc. 6th Int. Conf. on Boiling Heat Transfer, May 7-12, 2006 (CD-ROM) (2006) 1

Physics

Fluid Dynamics

Scientific paper

This paper deals with the triggering mechanism of the boiling crisis, a transition from nucleate to film boiling. We observe the boiling crisis in pool saturated boiling experimentally at nearly critical pressure to take advantage of the slowness of the bubble growth and of the smallness of the Critical Heat Flux (CHF) that defines the transition point. Such experiments require the reduced gravity conditions. Close to the CHF, the slow growth of the individual dry spots and their subsequent fusion on the transparent heater are observed through the latter. As discussed in the paper, these observations are consistent with numerical results obtained with the vapor recoil model of the boiling crisis.

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