The experimental study on average holdup in multiphase pipelines with low loads of liquids was conducted on a large multiphase flow loop.The average holdup increased with increasing liquid load and decreased with incr...The experimental study on average holdup in multiphase pipelines with low loads of liquids was conducted on a large multiphase flow loop.The average holdup increased with increasing liquid load and decreased with increasing gas velocity, and also depended on the undulation of pipeline and flow patterns in the pipeline. The effects of eight dimensionless parameters on average holdup were seriated with grey relational degree analysis so as to find the most important factors affecting the average holdup in multiphase pipelines with low loads of liquids. An average holdup correlation based on low liquid loads was also developed and the correlation related the most important three factors including superficial gas velocity number(N_ gw), superficial liquid velocity number(N_ lw) and liquid Reynolds number(Re_l) to the average holdup.Finally the correlation was tested with the field data and the result was satisfying.展开更多
A pigging model incorporating three different regions was developed for predicting the dynamics of the pigging operation in two-phase flow pipelines. The model incorporates a transient two-fluid model.The mixed Eulere...A pigging model incorporating three different regions was developed for predicting the dynamics of the pigging operation in two-phase flow pipelines. The model incorporates a transient two-fluid model.The mixed Eulerean-Lagrangian approach was used to couple the transient model and the pigging model which can predict the pigging time, velocity and the change of pigging parameters. An experimental study was carried out to acquire two-phase transient flow and pigging data on a 380m long,81mm diameter horizontal pipeline. A computer-based data acquisition system was used to obtain detailed information of the flow behavior during experimental runs. The data include pigging time, inlet pressure, accumulated liquid in pipeline, pressure and pigging velocity distribution.The predicted results compared fairy well with the experimental data.展开更多
文摘The experimental study on average holdup in multiphase pipelines with low loads of liquids was conducted on a large multiphase flow loop.The average holdup increased with increasing liquid load and decreased with increasing gas velocity, and also depended on the undulation of pipeline and flow patterns in the pipeline. The effects of eight dimensionless parameters on average holdup were seriated with grey relational degree analysis so as to find the most important factors affecting the average holdup in multiphase pipelines with low loads of liquids. An average holdup correlation based on low liquid loads was also developed and the correlation related the most important three factors including superficial gas velocity number(N_ gw), superficial liquid velocity number(N_ lw) and liquid Reynolds number(Re_l) to the average holdup.Finally the correlation was tested with the field data and the result was satisfying.
文摘A pigging model incorporating three different regions was developed for predicting the dynamics of the pigging operation in two-phase flow pipelines. The model incorporates a transient two-fluid model.The mixed Eulerean-Lagrangian approach was used to couple the transient model and the pigging model which can predict the pigging time, velocity and the change of pigging parameters. An experimental study was carried out to acquire two-phase transient flow and pigging data on a 380m long,81mm diameter horizontal pipeline. A computer-based data acquisition system was used to obtain detailed information of the flow behavior during experimental runs. The data include pigging time, inlet pressure, accumulated liquid in pipeline, pressure and pigging velocity distribution.The predicted results compared fairy well with the experimental data.
