Time resolved measurements of droplet preferential concentration in homogeneous isotropic turbulence without mean flow

doi:10.1063/1.5063673

	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
发表期刊	PHYSICS OF FLUIDS
	2019-02-01
卷号	31 期号:2 页码:AR25103
ISSN	1070-6631
摘要	An 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).
DOI	10.1063/1.5063673
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000460093800069
关键词[WOS]	INERTIAL PARTICLES ; SETTLING VELOCITY
WOS研究方向	Mechanics ; Physics, Fluids & Plasmas
WOS类目	Mechanics ; Physics
项目资助者	Engineering and Physical Sciences Research Council (EPSRC) [EP/E029515/] ; European Union COST Action [MP0806] ; National Natural Science Foundation of China (NSFC) [1187020923]
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Hardalupas, Y
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/78513
专题	高温气体动力学国家重点实验室
作者单位	1.{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
推荐引用方式 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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