Settling behavior of polydisperse droplets in homogeneous isotropic turbulence

doi:10.1063/5.0146589

	Settling behavior of polydisperse droplets in homogeneous isotropic turbulence
	Zhu HY(朱航宇); Pan, Chong ; Lian H(连欢)
发表期刊	PHYSICS OF FLUIDS
	2023-05
卷号	35 期号:5 页码:53306
ISSN	1070-6631
摘要	The settling behavior of polydisperse droplets in homogeneous and isotropic turbulence was measured by an ultra-high-resolution two-dimensional Particle Image Velocimetry. The aim of the present study is to provide new insight on the dependence of multi-scale particle settling behavior on characteristic parameters of two-phase turbulent flow via a sophisticate conditional analysis. The relative settling strength (defined as the ratio of mean droplet settling velocity to root mean square velocity of turbulence), whose effect on droplet settling behavior is of the primary interest, ranges as S v(L) = 0.5 - 2.0. The turbulence Taylor Reynolds number is R e (?) = 200 - 300, and the droplet Stokes number is S t (p) = 0.1 - 10. Voronoi analysis is performed to obtain the concentration field of discrete droplets from particle images. Particle structures including clusters or voids are detected, and the droplet settling velocities corresponding to various probing conditions, such as St(p), local particle concentration, and size of particle structures, were then analyzed. For the present configuration (droplet net sedimentation), there is a non-monotonic dependency of the settling velocity on local particle concentration. The negative correlation between them occurs in the moderate-concentration sub-regime and is insensitive to the variation of Sv(L), in which individual droplets interact with turbulent flow independently. It can be well explained by the commonly invoked preferential sweeping mechanisms. On the other hand, the dense-concentration regime, in which droplets prefer to accumulate into clusters, presents a positive correlation; namely, the conditional-averaged settling velocity decreases with the increase in local particle concentration. In this sub-regime, it is not the scale of single particles but the scale of particle clusters and the relative strength of turbulence (measured by Sv(L)) that jointly determines the droplet settling behavior. Such a process, to our knowledge, is consistent with the so-called multi-scale preferential sweeping effect.
DOI	10.1063/5.0146589
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000981452000024
WOS研究方向	Mechanics ; Physics, Fluids & Plasmas
项目资助者	National Natural Science Foundation of China (NSFC) [12102167, 11872366, 91952302] ; China Postdoctoral Science Foundation [2021M701580]
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Lian, H (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China. ; Pan, C (corresponding author), Beihang Univ, Fluid Mech Key Lab Educ Minist, Beijing 100191, Peoples R China. ; Pan, C (corresponding author), Beihang Univ, Ningbo Inst Technol, Aircraft & Prop Lab, Ningbo 315800, Peoples R China.
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/92425
专题	高温气体动力学国家重点实验室
作者单位	1.{Zhu Hang-Yu, Lian Huan} Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China 2.{Zhu Hang-Yu, Pan Chong} Beihang Univ Fluid Mech Key Lab Educ Minist Beijing 100191 Peoples R China 3.{Zhu Hang-Yu} Southern Univ Sci & Technol Ctr Complex Flows & Soft Matter Res Shenzhen 518055 Peoples R China 4.{Zhu Hang-Yu} Southern Univ Sci & Technol Dept Mech & Aerosp Engn Shenzhen 518055 Peoples R China 5.{Pan Chong} Beihang Univ Ningbo Inst Technol Aircraft & Prop Lab Ningbo 315800 Peoples R China
推荐引用方式 GB/T 7714	Zhu HY,Pan, Chong,Lian H. Settling behavior of polydisperse droplets in homogeneous isotropic turbulence[J]. PHYSICS OF FLUIDS,2023,35,5,:53306.
APA	朱航宇,Pan, Chong,&连欢.(2023).Settling behavior of polydisperse droplets in homogeneous isotropic turbulence.PHYSICS OF FLUIDS,35(5),53306.
MLA	朱航宇,et al."Settling behavior of polydisperse droplets in homogeneous isotropic turbulence".PHYSICS OF FLUIDS 35.5(2023):53306.

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