Abstract
In the first part of the paper a hydrodynamical model is proposed for the regime of isolated bubbles. The model which is of the boundary-layer type takes into account the circulation motion caused in the liquid by the bubbles which break off. Two equations are obtained, one holding for laminar, the other for turbulent flow. In the second part a mechanism of the heat transfer at large heat fluxes is proposed implying the existence of vapour columns and the motion of a thin liquid film under these columns. In this mechanism it is considered that the rate of heat transfer is dependent on: (1) the hydrodynamic interaction between the liquid threads moving towards the heating surface and the vapour columns; (2) the motion of the liquid as a thin layer under the vapour columns, under the action of surface forces; (3) the vaporization of this film which takes place at the liquid-vapour interface and explosively in the neighbourhood of the active centres.
Published Version
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