Yong Wang , Ming Li , Jie Chen , Jianing Lei , Zhenyu Tao , Qiang Xu , Houlin Liu
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引用次数: 0
Abstract
This study investigates the solid-liquid two-phase flow characteristics in a centrifugal pump under stall conditions, with a particular focus on the influence of particle property. A CFD-DEM coupled approach is used to simulate the interaction between liquid and particles. The blockage intensity and pressure pulsation under varying particle concentrations and sizes are analyzed in detail. Entropy theory is used to evaluate the energy loss due to the combined effects of liquid and particles. The results indicate that the severity of stall significantly influences the flow structure. While the primary frequency of pressure pulsation in the impeller is the shaft frequency (fn), stall vortices induce strong secondary frequency pulsation with a characteristic frequency of 0.11fn. Compared to the critical stall condition, the blockage intensity is 10 % higher than that under the deep stall condition. Furthermore, the pressure pulsation amplitude and entropy generation are also significantly higher under the deep stall condition. However, the influence of particle concentration and size on flow structure is less pronounced than that of the stall severity. Increased particle concentration and size leads to slight increases in blockage intensity, pressure pulsation amplitude, and entropy generation, with concentration exhibiting a greater impact than size.
期刊介绍：
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.
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