The influence of bubble size on critical detachment flow field parameters of bubble-particle aggregate in an isotropic turbulence field: Experiment and simulation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-03-21 DOI:10.1016/j.powtec.2025.120960

Wenqing Shi , Hongji Chen , Shihao Ding , Xiahui Gui , Yijun Cao , Yaowen Xing

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Abstract

Bubble plays an essential role in the flotation process, and their size has a significant impact on the bubble-particle interaction. However, the critical fluid parameters for particle detachment from bubbles of different sizes remain unclear. To address this, an isotropic turbulent field was generated using a customized oscillating grid system, systematically investigating the influence of bubble size on critical detachment flow field parameters of bubble-particle aggregate in an isotropic turbulence field. Additionally, numerical simulations were employed to extract key fluid parameters within the oscillating grid system. The results indicate that the flow field exhibits a sinusoidal periodic variation with grid motion. A highly homogeneous isotropic turbulent field was generated in the central region of the tank, and both velocity and vorticity in this region increase with oscillation frequency. Through the analysis of the bubble-particle detachment dynamics, it was found that larger bubbles tend to detach more easily from the particle surface. Furthermore, the detachment process can be divided into three distinct stages: bubble sliding, bubble shrinkage, and bubble necking rupture. Finally, based on experimental and numerical simulations, the critical flow field parameters for bubble detachment from particle surfaces at different bubble sizes were determined.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

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.