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Time resolved measurements of droplet preferential concentration in homogeneous isotropic turbulence without mean flow
Lian H(连欢); 张新宇(Chang X Y); Hardalupas Y
Source PublicationPHYSICS OF FLUIDS
2019-02-01
Volume31Issue:2Pages:AR25103
ISSN1070-6631
AbstractAn experimental investigation of the time-dependent spatial distribution of droplet concentration in a "box" of stationary homogeneous and isotropic turbulence without mean flow was performed for polydispersed droplet clouds with a wide range of mean droplet diameters and droplet size distributions, characterized by a representative Stokes number, based on the droplet arithmetic diameter and the Kolmogorov time scale of the flow, varying between 0.2 and 6, and for turbulent Reynolds numbers of 98, 127, 147, and 235. A novel morphological tracking scheme was used to provide temporal tracking of droplet clusters according to cluster morphological features. The tracking scheme was based on Voronoi space tessellation, multivariate kernel density estimation, and mean shift feature space tracking. The developed tracking scheme was used to establish the relationship between the morphological features of droplet clusters, i.e., number of clusters per unit area and cluster length scales, and the velocity of droplet clusters. The time scale of the droplet clusters increased with both the turbulent Reynolds number and the Stokes number, but its dependence was stronger on the turbulence level. In addition, the effect of filling factors of turbulent flows by turbulent structures on droplet clustering was discussed, which led to suggestions of potential flow control methods to mitigate droplet preferential concentration. (c) 2019 Author(s).
DOI10.1063/1.5063673
Indexed BySCI ; EI
Language英语
WOS IDWOS:000460093800069
WOS KeywordINERTIAL PARTICLES ; SETTLING VELOCITY
WOS Research AreaMechanics ; Physics, Fluids & Plasmas
WOS SubjectMechanics ; Physics
Funding OrganizationEngineering and Physical Sciences Research Council (EPSRC) [EP/E029515/] ; European Union COST Action [MP0806] ; National Natural Science Foundation of China (NSFC) [1187020923]
Classification一类/力学重要期刊
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/78513
Collection高温气体动力学国家重点实验室
Affiliation1.{Lian, H、Chang, XY} Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
2.{Hardalupas, Y} Imperial Coll London, Dept Mech Engn, London SW7 2AZ, England
Recommended Citation
GB/T 7714
Lian H,Zhang XY,Hardalupas Y. Time resolved measurements of droplet preferential concentration in homogeneous isotropic turbulence without mean flow[J]. PHYSICS OF FLUIDS,2019,31(2):AR25103.
APA 连欢,张新宇,&Hardalupas Y.(2019).Time resolved measurements of droplet preferential concentration in homogeneous isotropic turbulence without mean flow.PHYSICS OF FLUIDS,31(2),AR25103.
MLA 连欢,et al."Time resolved measurements of droplet preferential concentration in homogeneous isotropic turbulence without mean flow".PHYSICS OF FLUIDS 31.2(2019):AR25103.
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