Numerical simulation of particle and bubble detachment process in turbulent flow environment using CFD-DEM

Abstract

Three-dimensional discrete element method (DEM) models were developed to simulate particle-bubble interactions by utilizing the API function within the EDEM software platform. Geometric grids were constructed using FLUENT software to induce isotropic turbulence, and this turbulence environment was incorporated into the CFD-DEM framework. The simulations focused on the detachment of particles and bubbles, with particle sizes ranging from 0.10 to 0.30 mm, particle densities ranging from 1500 to 2500 kg/m³, and fixed bubble sizes of 1.00, 1.20, 1.60, and 2.00 mm. The detachment processes occurred within a turbulent flow field at distances of 1, 1.5, 2, and 3 mm from the grid. It is found that the particle-bubble bond required more capillary force to maintain attachment equilibrium as the particle density and size, bubble size, and flow field turbulence environment increased, the smaller the initial flow velocity to bring the bubble and particle to a critical desorption state, indicating the increase in all these factors were not conducive to attachment stability.

Keywords:

• CFD-DEM
• detachment
• particle-bubble
• turbulence

Acknowledgments

The authors would like to thank the financial supports from the National Natural Science Foundation of China (Grant No. 52274281) and the National Key Research and Development Program of China (Grant No. 2022YFB4100900).

Author contributions

Xubei Huang: validation, formal analysis, visualization, software, writing—review and editing. Zhijun Zhang: conceptualization, methodology, funding acquisition, investigation, writing—original draft.

Disclosure statement

No potential conflict of interest was reported by the author(s).