| The mechanistic approach to gas-liquid flow has been gaining in popularity over the last decade. However currently no models exist to predict pressure drop and void fraction in steeply inclined intermittent flow. In this work, a model has been developed for prediction of pressure drop and void fraction in intermittent flow at all inclination angles, and verified for angles between {dollar}-{dollar}9{dollar}spcirc{dollar} and +90{dollar}spcirc{dollar}.; This model is also suitable for predicting pressure drop and void fraction within the bubble and churn flow regimes. Pressure drop and void fraction predictions are compared with published experimental data on inclined intermittent gas-liquid flow, and agreement is found to be very good.; While accurate estimates of pressure drop and void fraction require accurate flow regime predictions, no comprehensive evaluation of inclined flow pattern prediction methods is currently available. This work compares the theories advanced by workers at the University of Houston and Tel-Aviv University, the University of Cincinnati and Drexel University, and the University of Tulsa against a wide range of experimental data. Alternative schemes are proposed for the dispersed bubble, distorted bubble, elongated bubble-slug, churn, and annular transitions. |
