Abstract
The number density, which is one of the most important parameters affecting the interfacial area concentration in the bubbly two-phase flow system, is formulated in terms of the differential transport equation. From this formulation it becomes apparent that the active nucleation site density on a heated channel surface is the key parameter in the prediction of the bubble number density. A constitutive relation for active nucleation site density is developed in pool boiling and extended to forced convective nucleate boiling. The active nucleation site densities predicted by this constitutive relation are in relatively good agreement with direct measurements available in the literature.
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