A laminar lid-driven cavity flow was constructed to represent the fundamental characteristics of an industrial dynamic mixer. The flow patterns and mixing process in the cavity were measured by using particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) experiments respectively. The refractive indices of the two miscible liquids involved were carefully matched to allow for unhindered optical access. The mixing process was predicted by using computational fluid dynamics (CFD) including models for species transport. The simulated flow and mixing results are in good agreement with the experimental data. The effects of density difference and viscosity of the two miscible fluids on the mixing process were evaluated. Minor variations in the densities of the fluids have significant influence on the mixing process in terms of the coefficient of variation as a function of time. The dimensionless group (Archimedes number over Reynolds number) is proposed to characterize the mixing process in the cavity.
Bibliographical noteThe authors gratefully acknowledge the financial support from the National and Key Research and Development Program of China (No.2016YFB0302801), National Natural Science Foundation of China (No.21676007) and Scientific Research and Technology Development Projects of China National Petroleum Corporation (No. 2016B-2605).
- mixing of miscible fluids
- particle image velocimetry
- planar laser-induced fluorescence
- lid-driven cavity flow
- species transport model
- Lid-driven cavity flow
- Species transport model
- Particle image velocimetry
- Planar laser-induced fluorescence
- Mixing of miscible fluids
- INDUCED FLUORESCENCE TECHNIQUE