Assessment of two-phase frictional models:Lockhart-Martinelli model and classic homogeneous models
Prediction of two-phase frictional pressure drop is of significance for the de-sign and flow resistance analysis of the two-phase flow equipment and pipelines.Among the proposed two-phase frictional models,the homogeneous flow models and the Lockhart-Martinelli model(L-M model)are often adopted for engineering application.The pressure has a considerable influence on the two-phase frictional pressure drop.Previ-ous assessments didn't evaluate the performance of these models under different pressures.It is unclear whether the L-M model is suitable for high-pressure two-phase flow,in what pressure range the homogeneous flow models is applicable.This paper as-sesses the homogeneous flow models and the L-M model against the test data from low-pressure refrigerant two-phase flow by Ould Didi、the test data from the 7 MPa two-phase flow by GASPARI and those from the high-pressure two-phase flow by Chen The assess-ments show that for intermediate and high-pressure two-phase flow,the L-M model has large prediction deviation,the higher the pressure,the larger the prediction deviation.On the contrary,for intermediate and high-pressure two-phase flow,the homogeneous flow models have high prediction accuracy.
two-phase frictional pressure droptwo-phase frictional multiplierLockhart-Martinelli modelhomogeneous flow model
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