Non-monotonic effect of Stokes number on turbulence modulation in particle-laden channel flow
文献类型：期刊论文
| 作者 | Liao, ZiMo; Lin, Fenghui; Liu, Luoqin; Liu, NanSheng; Lu, XiYun |
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2025-07-24 |
| 卷号 | 1015页码:38 |
| 关键词 | multiphase and particle-laden flows turbulent flows particle/fluid flows |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2025.10340 |
| 通讯作者 | Liu, Nan-Sheng(lns@ustc.edu.cn) ; Lu, Xi-Yun(xlu@ustc.edu.cn) |
| 英文摘要 | The effect of Stokes number on turbulence modulation in particle-laden channel flow is investigated through four-way coupled point-particle direct numerical simulations, with the mass loading fixed at 0.6 and the friction Stokes number $St<^>+$ varying from 3 to 300. A full transition pathway is observed, from a drag-enhanced to a drag-reduced regime, eventually approaching the single-phase state as $St<^>+$ increases towards 300. A set of transport equations for the particle phase is derived analytically to characterise the interphase coupling, within the framework of the point-based statistical description of particle-laden turbulence. By virtue of this, two dominant mechanisms are identified and quantitatively characterised: a positive, particle-induced extra transport that decreases monotonically with increasing $St<^>+$ , and a negative, particle-induced extra dissipation that varies non-monotonically with $St<^>+$ . The coupling of these two mechanisms leads to a direct contribution of the particle phase to the shear stress balance, the turbulent kinetic energy budgets and the Reynolds stress budgets. Consequently, as $St<^>+$ increases, the self-sustaining cycle of near-wall turbulence transitions from being augmented to being suppressed and, eventually, returns to the single-phase state. This gives rise to an indirect effect, manifested as a non-monotonic modulation of Reynolds shear stress and turbulence production rate. Taken together, complex interplays between particle-modified turbulent transport, particle-induced extra transport and extra dissipation are analysed and summarised, providing a holistic physical picture composed of consistent interpretations of turbulence modulation induced by small heavy particles. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | DIRECT NUMERICAL-SIMULATION ; SOLID 2-PHASE FLOW ; OF-THE-ART ; LDV MEASUREMENTS ; REYNOLDS-STRESS ; DRAG REDUCTION ; PIPE-FLOW ; TRANSPORT ; STATISTICS ; DEPOSITION |
| 资助项目 | National Natural Science Foundation of China ; University of Science and Technology of China ; Hefei Advanced Computing Center |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001533967800001 |
| 资助机构 | National Natural Science Foundation of China ; University of Science and Technology of China ; Hefei Advanced Computing Center |
| 其他责任者 | Liu, Nan-Sheng，Lu, Xi-Yun |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/102298]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 作者单位 | Univ Sci & Technol China, Sch Engn Sci, State Key Lab High Temp Gas Dynam, Hefei 230027, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liao, ZiMo,Lin, Fenghui,Liu, Luoqin,et al. Non-monotonic effect of Stokes number on turbulence modulation in particle-laden channel flow[J]. JOURNAL OF FLUID MECHANICS,2025,1015:38. |
| APA | Liao, ZiMo,Lin, Fenghui,Liu, Luoqin,Liu, NanSheng,&Lu, XiYun.(2025).Non-monotonic effect of Stokes number on turbulence modulation in particle-laden channel flow.JOURNAL OF FLUID MECHANICS,1015,38. |
| MLA | Liao, ZiMo,et al."Non-monotonic effect of Stokes number on turbulence modulation in particle-laden channel flow".JOURNAL OF FLUID MECHANICS 1015(2025):38. |
入库方式： OAI收割
来源：力学研究所
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