Lift forces on solid spherical particles in unbounded flows. (23rd November 2019) - Shi, Pengyu
Highlights: Works concerning lift forces on solid spheres with Re p up to 10 3 are reviewed. Conditions of spin-lift, shear-lift, lift in free- and forced rotation are considered. Improved correlations for spin-lift and shear-lift are proposed. Additive nature of spin- and shear-lift in free rotation is confirmed for Re p ≤ 200. Similar superposition in forced rotation is confirmed for 2 Rr ≤ Sr and Re p ≤ 500. Abstract: The present work is concerned with the lift forces acting on particles immersed in an unbounded fluid. Both mechanisms due to rotation of the particle and vorticity of the fluid flow are considered. Focus is on solid spherical particles at Reynolds numbers up to 10 3 which are relevant for particulate flows in chemical and minerals engineering. A comprehensive review of existing results from analytical, numerical, and experimental studies is given. In particular in the simulation area many new data have appeared in the past 10 years since the earlier review of Loth [AIAA Journal 46 (2008), 801–809]. The available correlations are critically assessed by comparison to data from experiment and direct numerical simulation. Based on the comparison new correlations are proposed and gaps or inconsistencies in the data are identified. The case of wall-bounded flows will be considered in a sequel.