A new unified model is proposed for the transition from annular to intermittent flow patterns for the entire range of pipe inclination angles. Experimentally, it has been observed that the transition from annular flow takes place at a critical void fraction. To obtain a transition boundary equation, conservation of momentum equations for gas and the liquid film are combined and solved with the critical void fraction. The new model captures the correct transition characteristics, agrees favorably with experimental flow pattern data, and performs the best when compared with previous transition models. [S0195-0738(00)00601-4]

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