The modulation of particles on coherent structure of turbulent boundary layer in dilute liquid-solid two-phase flow with PIV

Sun, Jinhua; Gao, Tiehong; Fan, Ying; Chen, Wenyi; Xuan, Ruixiang

doi:10.1016/j.powtec.2018.12.044

Cited by 14 publications

(3 citation statements)

References 28 publications

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“…Regarding the occurrence ratio of ejection and sweep events along the normal‐wall direction, Sun et al. (2019) observed that both the ratio of the ejection number to the total number of ejection and sweep events and that of the sweep number to the total number of ejection and sweep events declined with the increase of the wall‐normal position in clear water condition. The number of ejection events was lower than that of sweep events; that is, the occurrence ratio of sweep events was higher than that of ejection events, which is consistent with the information we extracted from the JHTDB (the occurrence ratio of sweep events was approximately 55%–60%).…”

Section: Characterization Of Lsms In the Tblmentioning

confidence: 99%

Probabilistic Characterization of Sweep and Ejection Events in Turbulent Flows and Its Implications on Sediment Transport

Tsai

2022

Water Resources Research

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Sediment transport in open channel flow has a significant impact on the siltation of rivers, reservoirs, and artificial channels, and it is one of the major topics studied in the water resources realm. Despite the intensive investigation done in the past, the transport mechanism of sediment particles seems to have reached a stage where further progress may depend on a more comprehensive understanding of the chaotic and intermittent behavior of turbulence instead of the temporally averaged streamwise momentum of a boundary layer that exhibits a smooth profile with no evidence of sharp changes in momentum. Among others, the existence of coherent structures in wall-bounded turbulent flows has been confirmed (

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Section: Characterization Of Lsms In the Tblmentioning

confidence: 99%

Probabilistic Characterization of Sweep and Ejection Events in Turbulent Flows and Its Implications on Sediment Transport

Tsai

2022

Water Resources Research

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“…However, only the coherent structures at the ocean surface can be detected, and the coherent events in deep ocean currents are ignored. Moreover, most 2 of 16 of these data-driven approaches rely on single-point measurements [33][34][35], PIV [36][37][38][39], and direct numerical simulations [40,41]. The single-point measurements can provide a one-dimensional signal according to Taylor's frozen hypothesis.…”

Section: Introductionmentioning

confidence: 99%

A Spatial Correlation Identification Model for Coherent Structure Extraction and Three-Dimensional Visualization

Mao,

Yang,

Sun

et al. 2024

JMSE

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Multi-scale coherent structures have been observed in ocean currents, which are induced by the interaction of shear flows with different velocities. Understanding the spatial configuration and scale characteristics of coherent structures will promote the explanation of physical ocean phenomena. Considering the self-similarity, we propose a spatial correlation identification model for coherent structure extraction and three-dimensional visualization based on the wavelet transform and time-dependent intrinsic correlation method. The spatial and scale distributions of coherent structures are related to the dissipation rate variation. Most large-scale coherent structures, with the largest length scale of 13 m, are found to exist in stable fluid, such as the water column below 50 m. However, small-scale structures are found in chaotic fluids, such as the upper layer. Furthermore, we found that coherent structures of different scales coexist simultaneously in the same depth range, indicating a simultaneous multi-scale structure pattern for turbulent flow investigations.

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“…Without altering the blade structure and operating parameters, the mixing process could be strengthened by arranging baffles. As fueled by the advancement of computer and laser measurement technology, experimental fluid dynamics method has been extensively employed to investigate the flow characteristics 22–24 . Thus, to gain insights into the effect of baffles on the flow characteristics driven by paddle turbine, PIV experiments were performed for the unbaffled stirred vessel as well as the standard baffled stirred vessel driven by single paddle turbine.…”

Section: Introductionmentioning

confidence: 99%

Effects of baffle on cycle‐to‐cycle variation in stirred vessel driven by paddle turbine using quadruple proper orthogonal decomposition

Fan

Sun

Gao

et al. 2021

Asia-Pacific J Chem Eng

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The flow of stirring process is complex and multiscale. To analyze the effects of baffle on the flow characteristics driven by paddle turbine, particle image velocimetry (PIV) experiments were performed for the unbaffled stirred vessel and the standard baffled stirred vessel stirred by the single paddle turbine. Under the baffle arrangement, the flow discharge was strengthened, and the range of high‐velocity region was obviously expanded, and the velocity significantly fluctuated near the blade. The swirling intensity behind the blade decreased significantly, and no significant wake structure was formed, thereby helping reduce the local velocity difference attributed to the wake structure and facilitate the uniform mixing of materials. The instantaneous velocity field was decomposed into four parts at different scales by employing quadruple Proper Orthogonal Decomposition method. The quantitative analysis of different scale flow structures in stirred process was realized. Under the baffle arrangement, the flow process was facilitated in the measurement plane. In addition, the fluctuation velocity increased significantly, and the mass transfer was enhanced by vortex motion of the fluid elements, which was conducive to the uniform mixing of materials.

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The modulation of particles on coherent structure of turbulent boundary layer in dilute liquid-solid two-phase flow with PIV

Cited by 14 publications

References 28 publications

Probabilistic Characterization of Sweep and Ejection Events in Turbulent Flows and Its Implications on Sediment Transport

Probabilistic Characterization of Sweep and Ejection Events in Turbulent Flows and Its Implications on Sediment Transport

A Spatial Correlation Identification Model for Coherent Structure Extraction and Three-Dimensional Visualization

Effects of baffle on cycle‐to‐cycle variation in stirred vessel driven by paddle turbine using quadruple proper orthogonal decomposition

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