- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | MAO Yuhong, CHEN Chao, LI Yarong, FU Haiyu. Fluctuation Characteristics of Wavy Vortex Field Within Annular Gap in Taylor-Couette[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230308
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The large eddy simulation (LES) method was applied to transiently simulate the wavy vortex field within the annular gap in Taylor-Couette and investigate the variation of fluctuations between wavy vortices. The wavy vortex field within the annulus gap was investigated from both two-dimensional and three-dimensional perspectives. The results indicate that the velocity vector field on the meridian plane of the two-dimensional wavy vortex field within the annular gap exhibits periodic fluctuation characteristics. The velocity vector field remains essentially the same at the beginning and end moments of the cycle. The axial velocity direction at the vortex junction changes constantly and periodically, while the radial and tangential velocity directions remain constant. The velocity values of the vortex pairs are greater than those of the vortex pairs inside the vortex, and the mainstream liquid transfer mainly occurs between the vortex pairs in the outward flow. Additionally, the fluctuation phenomenon of the three-dimensional wavy vortex field is clearly evident and exhibits periodic characteristics. The cycles for each working condition (10, 20, 30, and 40 r/min) are 12.94 seconds, 6.80 seconds, 1.93 seconds, and 1.49 seconds, respectively. With the increase in rotational Reynolds number, there is a significant decrease in vortex fluctuation amplitude and a reduction in the duration of fluctuations. The periodic flow transport of the mainstream liquid between vortices within the annulus gap propels fluid microclusters to perform a spiral-coupled vortex rotation around the inner cylinder within the annulus gap.
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