The Influence of Frame Rotation on Passive Additive Turbulent Transport Phenomena

In this presentation, the influence of rotation on the turbulent dispersion of a passive additive will be discussed. For low rotation numbers, the theory shows that the transverse component of a passive additive turbulent flux is mitigated by a coupling between the shear component of the Reynolds stress and the longitudinal component of the mean passive additive flux. At high rotation numbers, the dispersion coefficient in the transverse (cross flow) direction is four times larger than the dispersion coefficient in the spanwise direction. Surprisingly, the dispersion coefficient in the longitudinal direction is relatively small. Koppula, K.S., S. Muthu, A. Bénard, and C. A. Petty 2013, “The URAPS closure for the normalized Reynolds stress”, Physica Scripta, T155.    Koppula, K.S., A. Bénard, and C. A. Petty, 2011, “Turbulent Energy Redistribution in Spanwise Rotating Channel Flows”, Ind. Eng. Chem. Res., 50 (15), 8905-8916. Koppula, K. S., A. Bénard, and C. A. Petty, 2009, “Realizable Algebraic Reynolds Stress Closure”, Chem. Eng. Sci., 64, 4611-4624.