Experimental investigation of fractal features of passive scalar mixing in turbulent pipe flow
文献类型：期刊论文
| 作者 | Li HX(李慧鑫)1,2; Xu D(徐多)1,2; He GW(何国威)1,2 |
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2025-08-19 |
| 卷号 | 1017页码:24 |
| 关键词 | turbulent mixing pipe flow |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2025.10454 |
| 通讯作者 | Xu, Duo(duo.xu@imech.ac.cn) |
| 英文摘要 | In this study, we present a fractal dimension analysis of high Schmidt number passive scalar mixing in experiments of turbulent pipe flow. By using the high-resolution planar laser-induced fluorescence technique, the scalar concentration fields are measured at Reynolds numbers $10\,000$ , $15\,000$ and $20\,000$ . In the inertial-convective range, the iso-scalar surface exhibits self-similar fractal characteristics, giving fractal dimension $1.67 \pm 0.05$ from the two-dimensional measurements over a range of length scales. This fractal dimension is approximately independent of the criteria of extracting the iso-scalar surfaces, the corresponding thresholds and the Reynolds numbers examined in this study. The crossover length scale, beyond which the $1.67 \pm 0.05$ fractal dimension is exhibited, is about ten times the Kolmogorov length scale, in agreement with previous studies. As the length scales decrease to be smaller than this crossover length scale, the fractal dimension, calculated from the one-dimensional signals, increases and approaches a saturation at approximately 2 (with the additive law) in the viscous-convective range, manifesting the space-filling characteristics, as theoretically predicted by Grossmann & Lohse (1994, Europhys. Lett., vol. 27, 347). This observation presents first-time experimental evidence for the fractal characteristics predicted by Grossmann and Lohse for the high Schmidt number passive scalar mixing. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | DIRECT NUMERICAL-SIMULATION ; CONCENTRATED LINE SOURCE ; DISSIPATION RATE ; GEOMETRIC-PROPERTIES ; BOUNDARY-LAYER ; ISO-SURFACES ; FLUID ; INTERFACE ; DIMENSION ; DYNAMICS |
| 资助项目 | National Natural Science Foundation of China[11988102] ; National Natural Science Foundation of China[92152106] ; China Postdoctoral Science Foundation[2023M733589] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001551824600001 |
| 资助机构 | National Natural Science Foundation of China ; China Postdoctoral Science Foundation |
| 其他责任者 | 徐多 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/103749]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, 1 Yanqihu East Rd, Beijing 101408, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Li HX,Xu D,He GW. Experimental investigation of fractal features of passive scalar mixing in turbulent pipe flow[J]. JOURNAL OF FLUID MECHANICS,2025,1017:24. |
| APA | 李慧鑫,徐多,&何国威.(2025).Experimental investigation of fractal features of passive scalar mixing in turbulent pipe flow.JOURNAL OF FLUID MECHANICS,1017,24. |
| MLA | 李慧鑫,et al."Experimental investigation of fractal features of passive scalar mixing in turbulent pipe flow".JOURNAL OF FLUID MECHANICS 1017(2025):24. |
入库方式： OAI收割
来源：力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。