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Boiling crisis is a transition between nucleate and film boiling. In thiscommunication we present a physical model of the boiling crisis based on thevapor recoil effect. Our numerical simulations of the thermally controlledbubble growth at high heat fluxes show how the bubble begins to spread over theheater thus forming a germ for the vapor film. The vapor recoil force not onlycauses the vapor spreading, it also creates a strong adhesion to the heaterthat prevents the bubble departure, thus favoring the further bubble spreading.Near the liquid-gas critical point, the bubble growth is very slow and allowsthe kinetics of the bubble spreading to be observed. Since the surface tensionis very small in this regime, only microgravity conditions can preserve aconvex bubble shape. Under such conditions, we observed an increase of theapparent contact angle and spreading of the dry spot under the bubble, thusconfirming our model of the boiling crisis.

Boiling crisis as inhibition of bubble detachment by the vapor recoil force