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Optimization of a Multiphase Mixed Flow Field in Backfill Slurry Preparation Based on Multiphase Flow Interaction
Rugao Gao1,2,3, Weijun Wang1, Keping Zhou2
1School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
ACS Omega
|October 2, 2023
Summary
This study optimizes cemented backfill slurry mixing using computational fluid dynamics (CFD) and a double-shaft mixer. The optimal design parameters ensure efficient mixing and slurry uniformity for improved performance.
Area of Science:
- Materials Science
- Chemical Engineering
- Fluid Dynamics
Background:
- Cemented backfill slurry preparation is crucial in mining and civil engineering.
- Efficient mixing is essential for slurry performance and structural integrity.
- Existing mixing models may not fully capture complex multiphase interactions.
Purpose of the Study:
- To analyze the dynamic behavior of cemented backfill slurry preparation.
- To optimize the design of a double-shaft mixer for improved mixing efficiency.
- To validate a computational fluid dynamics (CFD) model for multiphase flow analysis.
Main Methods:
- Combined structural performance analysis of a double-shaft mixer with Euler multiphase flow CFD.
- Incorporated transient kinetic parameters and gas-liquid phase interactions.
- Adjusted lift model and turbulence energy equation using user-defined functions.
Main Results:
- Identified optimal mixer design: 45 rpm rotation velocity and 25° blade installation angle.
- Evaluated mixing effect using flow field velocity, gas phase mixing, uniformity, and turbulent energy dissipation.
- Experimental tests confirmed the refined two-fluid model's validity.
Conclusions:
- The optimized double-shaft mixer design enhances cemented backfill slurry preparation.
- The refined two-fluid CFD model provides a reliable basis for evaluating mixing equipment.
- This research contributes to improving the efficiency and performance of slurry mixing processes.
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