中文版 | English
Title

Mechanisms and models of particle drag enhancements in turbulent environments

Author
Corresponding AuthorPeng,Cheng
Publication Years
2023-03-25
DOI
Source Title
ISSN
0022-1120
EISSN
1469-7645
Volume959
Abstract
This study conducts direct numerical simulations of free-streaming turbulence passing over individual fixed particles and particle arrays of different number densities. The purpose is to investigate the changes in the mean particle drag due to turbulent environments and the responsible mechanisms. It is confirmed that turbulent environments significantly enhance the particle drag relative to the standard drag in a uniform flow, and the nonlinear dependency of the drag force on the instantaneous incoming flow velocity is insufficient to explain the enhancement. Two mechanisms of particle-turbulence interactions are found to be responsible for the particle drag enhancements. The first mechanism is the enlarged pressure drops on the particle surface, mainly governed by the large scales in turbulent flows. The second mechanism is the increased viscous stresses on the particle surface, dominated by the small scales that enhance the mixing of the low- and high-speed fluids across the particle boundary layer. In terms of quantitative drag enhancement predictions, more general models accounting for the anisotropy of the turbulence are proposed, which fit well with both the simulation data generated in this study and those reported in the literature. Finally, by measuring the drag forces of laminar and turbulent flows passing over arrays of particles, it is found that the overall particle drag increases with decreasing particle-particle relative gap distance. However, the relative enhancement due to turbulence decreases with the particle-particle relative gap distance.
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Others
WOS Accession No
WOS:000957312700001
ESI Research Field
ENGINEERING
Scopus EID
2-s2.0-85151530075
Data Source
Scopus
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/524191
DepartmentDepartment of Mechanics and Aerospace Engineering
Affiliation
1.Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education,School of Mechanical Engineering,Shandong University,Jinan,250061,China
2.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Center for Complex Flows and Soft Matter Research,Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.Guangdong-Hong Kong-Macao Jt. Lab. for Data-Driven Fluid Mechanics and Engineering Applications,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
Recommended Citation
GB/T 7714
Peng,Cheng,Wang,Lian Ping. Mechanisms and models of particle drag enhancements in turbulent environments[J]. Journal of Fluid Mechanics,2023,959.
APA
Peng,Cheng,&Wang,Lian Ping.(2023).Mechanisms and models of particle drag enhancements in turbulent environments.Journal of Fluid Mechanics,959.
MLA
Peng,Cheng,et al."Mechanisms and models of particle drag enhancements in turbulent environments".Journal of Fluid Mechanics 959(2023).
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