Abstract

The propagation of void fraction disturbances (i.e. void waves) in bubbly two-phase air-oil flow was investigated experimentally. The void wave data often showed two simultaneous void wave propagations; in particular, the classical kinematic void wave and a faster void wave propagation associated with bubble clusters. Significantly, the bubbly-to-slug flow regime transition was found to be associated with amplification of the void waves associated with the propagating bubble clusters. These data should be valuable for the assessment of the closure laws used in two-fluid models and for the development of mechanistic models for the bubbly-slug flow regime transition.

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