Abstract
Abstract
Highlights
Individual cohesive particles suspended in liquid or gaseous fluid flows tend to form larger aggregates, due to attractive inter-particle forces that cause the primary particles to flocculate
In the present investigation we have employed one-way coupled simulations to explore the dynamics of cohesive particles in homogeneous isotropic turbulence
The simulations account for the Stokes drag, as well as lubrication, cohesive and direct contact forces
Summary
Individual cohesive particles suspended in liquid or gaseous fluid flows tend to form larger aggregates, due to attractive inter-particle forces that cause the primary particles to flocculate. The present investigation aims to explore the interplay between floc aggregation, deformation and breakup from inception all the way to the dynamic equilibrium phase, with the goal of obtaining scaling laws for both of these qualitatively different stages Towards this end, we will employ a simulation approach that tracks dispersed individual spherical particles of a given diameter in homogeneous isotropic turbulence. The homogeneous isotropic turbulence is generated and maintained via the forcing method of Eswaran & Pope (1988) We will employ these simulations in order to investigate the floc size and shape evolution, the floc size distribution during the equilibrium stage, the orientation of the flocs with regard to the principal directions of the Eulerian strain and the Lagrangian stretching, as well as the role of the Kolmogorov length scale in limiting floc growth.
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