Turbulence structure of the Rayleigh-Bénard convection using liquid CO2 as working fluid
文献类型：期刊论文
| 作者 | Zhao, Yifan3,4; Wu, Di4 ; Duan, Longsheng2,4; Wang, Jia4; Li, Jialiang3; Duan, Li1,4; Kang, Qi1,4; Duan L(段俐); Kang Q(康琦); Wu D(吴笛)
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| 刊名 | PHYSICS OF FLUIDS
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| 出版日期 | 2024 |
| 卷号 | 36期号:1页码:15 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/5.0173929 |
| 通讯作者 | Wang, Jia(wangjia@imech.ac.cn) ; Li, Jialiang(lijialiang@sdust.edu.cn) ; Duan, Li(duanli@imech.ac.cn) |
| 英文摘要 | We studied the evolution of flow structures and large-scale circulations (LSC) in Rayleigh-B & eacute;nard convection (RBC) using liquid carbon dioxide as the working medium. In this experiment, a transparent sapphire pressure vessel with observable internal flow was designed, and different temperature differences were applied between the upper and the lower surfaces of the fluid to obtain different Rayleigh numbers (Ra). We employed proper orthogonal decomposition and reconstruction to extract internal flow structures from the shadowgraphy images. We used optical flow techniques to acquire the velocity field of the flow, and we reconstructed the temperature field inside the supercritical fluid using the relationship between shadowgraphy images and refractive index. It is clearly observed that the RBC begins to produce different flow structures under a small temperature difference of 0.4 degrees C. As the number of Ra increases, the number and the speed of plumes increase, and the morphology of plumes gradually becomes elongated. When Ra exceeds a certain critical value, an LSC structure appears in the flow field, and the plumes translate laterally with the large-scale circulation, and the disorder of the vortex structure in the central flow region increases significantly. Three typical flow structures were observed: (1) single plume, (2) thermal boundary layer traveling waves, and (3) Rayleigh-Taylor instability waves. We believe that the traveling wave structure is the precursor to the single plume. The temperature field analysis of the three structures was carried out, and the velocity of the typical plume was calculated by the optical flow method. It was found that LSC transitioned from oval to square shape with the increase in Ra, and the internal plume Reynolds number slowly increased with the increase in Ra. By the in-depth study of the thermal turbulence characteristics and the coherent structure evolution law of RBC, this paper provides experimental support for revealing the mechanism of enhanced heat transfer in energy system with a liquid CO2 working fluid. |
| WOS关键词 | RAYLEIGH-BENARD CONVECTION ; VELOCITY-FIELD ; FLOW ; DYNAMICS ; PLUMES |
| 资助项目 | China Manned Space Engineering Program (Fluid Physics Experimental Rack) ; China Manned Space Engineering Program (Priority Research Program of Space Station) ; National Natural Science Foundation of China[12032020] ; National Natural Science Foundation of China[12072354] ; National Natural Science Foundation of China[12102438] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001145847500001 |
| 资助机构 | China Manned Space Engineering Program (Fluid Physics Experimental Rack) ; China Manned Space Engineering Program (Priority Research Program of Space Station) ; National Natural Science Foundation of China |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/94522]  |
| 专题 | 力学研究所_国家微重力实验室 |
| 通讯作者 | Wang, Jia; Li, Jialiang; Duan, Li |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Beijing Syst Design Inst Electromech Engn, Beijing 100039, Peoples R China 3.Shandong Univ Sci & Technol, Coll Energy & Min Engn, Qingdao 266590, Peoples R China 4.Chinese Acad Sci, Key Lab Micrograv, Inst Mech, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Yifan,Wu, Di,Duan, Longsheng,et al. Turbulence structure of the Rayleigh-Bénard convection using liquid CO2 as working fluid[J]. PHYSICS OF FLUIDS,2024,36(1):15. |
| APA | Zhao, Yifan.,Wu, Di.,Duan, Longsheng.,Wang, Jia.,Li, Jialiang.,...&吴笛.(2024).Turbulence structure of the Rayleigh-Bénard convection using liquid CO2 as working fluid.PHYSICS OF FLUIDS,36(1),15. |
| MLA | Zhao, Yifan,et al."Turbulence structure of the Rayleigh-Bénard convection using liquid CO2 as working fluid".PHYSICS OF FLUIDS 36.1(2024):15. |
入库方式： OAI收割
来源：力学研究所
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