Figure 7. Density reduction versus time in eccentric annulus for different inclination angles (top) and density reduction versus time in eccentric and concentric annulus with an without rotation (bottom)

From

Numerical Simulation and Experiments of Barite Sag in Horizontal Annulus

Yahya Hashemian, Stefan Miska, Mengjiao Yu, Evren Ozbayoglu, Nicholas Takach

American Journal of Numerical Analysis. 2014, 2(1), 14-19 doi:10.12691/ajna-2-1-4