Abstract
Based on Bernoulli statistics of bubble dynamics, a model of void fraction fluctuations in two-phase flows is introduced. The model is used to characterize changes of the intensity of void fraction fluctuations at various two-phase flow regimes, i.e. bubbly, slug and annular flows. Depending on the applied frequency band, the behavior of the band-passed variance of void fraction fluctuations changes significantly. At high frequencies, the band-passed variance increases monotonously with increasing void fractions, while the variance over the whole frequency range has a prominent maximum. By performing model calculations, the relationship between microscopic two-phase flow parameters and macroscopic flow quantities has been analyzed.
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