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Comparison and analysis of different critical velocity models about the pipeline transport for the medium and coarse sand
Published in Guojun Hong, Gongxun Liu, Liquan Xie, Hydraulic Engineering V, 2018
Runli Tao, Lu Zhang, Yuchi Hao, Yanchao Shen, Chaozhe Yuan
In dredging, the slurry is transported through the long pipeline from the dredged site to the storage site by the cutter suction dredger. Slurry is the mixture of sand and water with large discharge and high concentration in the pipeline, and the solids will gradually stratify and possibly deposit during the transportation. Meanwhile, due to the distance extension of the pipeline, the head loss increases and the slurry velocity in the pipeline decreases gradually. When the velocity is less than the critical velocity, pipeline plugging may happen. One of the main concerns in slurry transport is the pipeline plugging. Plugging will not only cause engineering safety problems, but also cause economic losses. Plugging can lead to frequent shutdowns, and a lot of time and manpower will be spent in solving this problem. As a result, determination of critical velocity under certain working conditions is an important method to prevent blockage. Therefore, researching the critical velocity has great value on improving the efficiency of pipeline transport and optimizing the construction process.
A CFD-based surrogate model for predicting slurry pipe flow pressure drops
Published in Particulate Science and Technology, 2023
Marwane Elkarii, Radouan Boukharfane, Saad Benjelloun, Chakib Bouallou
The transport of liquid-solid slurries in pipes are encountered in many engineering fields, such as mining and chemical processing. In fact, slurry pipelines are more efficient and environmentally friendly than railway transportation. Furthermore, advantages like reliability, low maintenance cost, and high availability of solid powder materials makes slurry transport systems more and more common for intra-plant and long distance transportation in many industries. The carrier slurry fluid may be highly viscous and have Newtonian or non-Newtonian rheology. Moreover, the flow within the pipe is generally highly turbulent and complex, and problems like pipe plugging, and solid sedimentation could often occur (Lahiri and Ghanta 2010). To ensure continuous and optimal flow, different parameters should be controlled. In particular, the distribution of the solids and the pressure drop in pipelines represent serious concerns to engineers, and their determination involves considerable technical difficulties.