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The term “unified” to describe modeling of two-phase flow in pipes has been used inconsistently in the past. Barnea (1987) used the term to describe a combination of different mechanistic models for predicting flow patterns for the whole range of inclination angles (-90° to +90°). Gomez et al. (2000a) used the term to describe a model that was applicable to wells and pipelines for inclination angles ranging from −10° to +90°. Shoham (2006) referred to unified comprehensive models that included the unified Barnea (1987) flow pattern prediction models, a modified Taitel and Dukler (1976) mechanistic model for predicting stratified flow, a combined Taitel and Barnea (1990) and Gomez et al. (2000b) slug flow model, an extended Alves et al. (1991) model for annular flow, and an extended Hasan and Kabir (1988) model for bubble flow. The extensions were an attempt to make the models valid for larger ranges of inclination angle.

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