摘要
Three-dimensional solid-liquid flow is mathematically formulated by means of the 'two-fluid' approach and the two-phase k-ε-AP turbulence model. The turbulent fluctuation correlations appearing in the Reynolds time averaged governing equations are fully incorporated. The solid-liquid flow field and solid concentration distribution in baffled stirred tanks with a standard Rushton impeller are numerically simulated using an improved 'inner-outer'iterative procedure. The flow pattern is identified via the velocity vector plots and a recirculation loop with higher solid concentration is observed in the central vicinity beneath the impeller. Comparison of the simulation with experimental data on the mean velocities and the turbulence quantities of the solid phase is made and quite reasonable agreement is obtained except for the impeller swept volume. The counterpart of liquid phase is presented as well.The predicted solid concentration distribution for three experimental cases with the average solid concentration up to 20% is also found to agree reasonably with the experimental results published in the literature.
Three-dimensional solid-liquid flow is mathematically formulated by means ofthe ''two-fluid'' approach and the two-phase k-ε-A_p turbulence model. The turbulent fluctuationcorrelations appearing in the Reynolds time averaged governing equations are fully incorporated. Thesolid-liquid flow field and solid concentration distribution in baffled stirred tanks with astandard Rushton impeller are numerically simulated using an improved ''inner-outer'' iterativeprocedure. The flow pattern is identified via the velocity vector plots and a recirculation loopwith higher solid concentration is observed in the central vicinity beneath the impeller. Comparisonof the simulation with experimental data on the mean velocities and the turbulence quantities ofthe solid phase is made and quite reasonable agreement is obtained except for the impeller sweptvolume. The counterpart of liquid phase is presented as well. The predicted solid concentrationdistribution for three experimental cases with the average solid concentration up to 20% is alsofound to agree reasonably with the experimental results published in the literature.
基金
theNationalNaturalScienceFoundationofChina(No.20006015,No.20236050andNo.50134020).
