| Settling behavior of polydisperse droplets in homogeneous isotropic turbulence | |
| Zhu HY(朱航宇); Pan, Chong; Lian H(连欢) | |
| Source Publication | PHYSICS OF FLUIDS
 |
| 2023-05 | |
| Volume | 35Issue:5Pages:53306 |
| ISSN | 1070-6631 |
| Abstract | 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 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000981452000024 |
| WOS Research Area | Mechanics ; Physics, Fluids & Plasmas |
| Funding Organization | National Natural Science Foundation of China (NSFC) [12102167, 11872366, 91952302] ; China Postdoctoral Science Foundation [2021M701580] |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | 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. |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/92425 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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.Rp_Au: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. |
| 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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Jp2023A259.pdf（4450KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment