LBM study of aggregation of monosized spherical particles in homogeneous isotropic turbulence

Wang, Guichao1; Wan, Dongdong2; Peng, Cheng3; Liu, Ke1; Wang, Lian-Ping3,4

2019-06-29

10.1016/j.ces.2019.03.004

CHEMICAL ENGINEERING SCIENCE   影响因子和分区

0009-2509

1873-4405

Direct numerical simulations of an aggregation system composed of monosized spherical particles in homogeneous isotropic turbulence have been performed using Lattice Boltzmann method (LBM). The effects of hydrodynamics on the aggregation process were considered by directly resolving the disturbance flows around finite-size solid particles using an interpolated bounce-back scheme. A nonuniform time-dependent large-scale stochastic forcing scheme was implemented within the mesoscopic multiple-relaxation-time LBM approach to maintain turbulence intensity at targeted levels. To simulate particle interactions, the non-contact surface force and the contact force were taken into account using the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory and the soft-sphere model, respectively. This interface-resolved direct numerical simulation (IR-DNS) combined with the well-known DLVO theory was employed to obtain an insight into the aggregation process of micron-size particles. Specifically, the model was used to study the effects of solid volume fraction on aggregate growth. Aggregates of larger sizes formed in local regions of higher concentration of particles due to higher encountering probability between particles. The effects of aggregating particles of different volume fractions on the statistically stationary homogeneous isotropic turbulent flow were investigated. It was found that the presence of particles attenuated the turbulent kinetic energy at large scales and augmented the kinetic energy at the small scales. This effect is more apparent with increasing volume concentration of particles. (C) 2019 Elsevier Ltd. All rights reserved.

Lattice Boltzmann method Mono-sized spherical particles Aggregation Turbulence

SCI ; EI

英语

第一 ; 通讯

Grand Research Project of National Natural Science Foundation of China[91852205]

Engineering

Engineering, Chemical

WOS:000462034900018

PERGAMON-ELSEVIER SCIENCE LTD

20191106620984

Aggregates ; Direct numerical simulation ; Kinetic energy ; Kinetic theory ; Kinetics ; Numerical methods ; Numerical models ; Spheres ; Stochastic systems ; Turbulence ; Volume fraction

Highway Engineering:406 ; Thermodynamics:641.1 ; Chemical Operations:802.3 ; Mathematics:921 ; Numerical Methods:921.6 ; Classical Physics; Quantum Theory; Relativity:931 ; Systems Science:961

CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, SUSTech Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China
2.Shandong Univ, Sch Mech Engn, Key Lab High Efficiency & Clean Mech Manufacture, Jinan 250061, Shandong, Peoples R China
3.Univ Delaware, Spencer Lab 126, Dept Mech Engn, Newark, DE 19716 USA
4.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China

Wang, Guichao,Wan, Dongdong,Peng, Cheng,et al. LBM study of aggregation of monosized spherical particles in homogeneous isotropic turbulence[J]. CHEMICAL ENGINEERING SCIENCE,2019,201:201-211.

Wang, Guichao,Wan, Dongdong,Peng, Cheng,Liu, Ke,&Wang, Lian-Ping.(2019).LBM study of aggregation of monosized spherical particles in homogeneous isotropic turbulence.CHEMICAL ENGINEERING SCIENCE,201,201-211.

Wang, Guichao,et al."LBM study of aggregation of monosized spherical particles in homogeneous isotropic turbulence".CHEMICAL ENGINEERING SCIENCE 201(2019):201-211.