Solid-liquid Flow in Stirred Tanks: "CFD-grade" Experimental Investigation


Solid-liquid Flow in Stirred Tanks: "CFD-grade" Experimental Investigation

Sommer, A.-E.; Rox, H.; Eckert, K.; Shi, P.; Rzehak, R.

Computational Fluid Dynamics (CFD) simulations of the solid-liquid flow in stirred tanks are feasible with appropriate closure models. However, no systematic assessment of different models have appeared because of lacking validation data. The present study accumulates a "CFD-grade" database on single-phase and two-phase flows experiments in a stirred tank (diameter=90mm). The velocity fields of the liquid and the solid phase are measured with Particle Image Velocimetry and Particle Shadow Velocimetry, respectively. The experiments cover a range of parameters as density ratio (ρS / ρL = 1.1...2.5), particle diameter (63 μm...500 μm), solid volume fraction (0.025vol%...0.1vol%) and impeller rotation speed (650rpm...1500 rpm). The mean and fluctuating liquid and solid velocities are obtained as time and angle-resolved averaging, as well as the local solid fraction. The experimental data of the single phase flow is compared with CFD simulations and show a good predictions. A systematic assessment of CFD models for solid-liquid flows will appear as a sequel.

Keywords: stirred tanks; solid-liquid flow; Particle Image Velocimetry (PIV); Particle Shadow Velocimetry (PSV); "Computational Fluid Dynamics (CFD)-grade" database

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Publ.-Id: 31701