Effect of adding finer particles on the transport characteristics of coarse-particle slurries in pipelines
| Autor: | Ya-dong Liu, Chao Huang, Li Mingzhi, Ru-hong Jiang, Wei-huang Liu, Yanping He |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Environmental Engineering
Materials science Slurry transport Flow (psychology) 020101 civil engineering Ocean Engineering 02 engineering and technology 01 natural sciences 010305 fluids & plasmas 0201 civil engineering Flow conditions Volume (thermodynamics) Flow velocity 0103 physical sciences Particle-size distribution Slurry Particle Composite material |
| Zdroj: | Ocean Engineering. 218:108160 |
| ISSN: | 0029-8018 |
| Popis: | Resistance reduction has always been a concerning problem in pipeline transportation projects. Moreover, adding fine particles has shown resistance reduction. Therefore, we studied the effect of adding finer particles on the transport characteristics of coarse-particle slurries in pipelines. The flow conditions and slurry characteristics, such as the flow velocity and particle volume concentration, and the addition of finer particles can reduce the resistance of coarse-particle slurries under certain working conditions. In this study, the changes in the transport characteristics of slurries with 0.44 mm diameter glass balls after adding an equal volume of 0.125 mm diameter glass balls under different flow velocities and volume concentrations were analysed. The effects of adding fine particles on the transport characteristics of coarse particles under different flow conditions were determined, including the distributions of the particle volume concentration, velocity, particle pressure, and wall shear stress. We observed that adding fine particles could change the flow regime of coarse particles near the critical flow velocity (from sliding bed to heterogeneous flow), thereby considerably reducing the pipeline resistance (by approximately 20%). At a high flow velocity (heterogeneous or homogeneous flow), the addition of fine particles will increase the resistance. The study results explain the mechanism and characteristics of resistance reduction on adding fine particles from the perspective of changing the flow regime. These findings can serve as a reference for further studying the resistance reduction mechanism on adding fine particles and for finding the optimal particle size distribution for slurry transport in pipelines. |
| Databáze: | OpenAIRE |
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