Experimental study of velocity statistics in wall-bounded turbulent emulsions Article Swipe
Fan Ya-ning
,
Zhang, Yi-Bao
,
Su, Jinghong
,
Yi Lei
,
Wang Cheng
,
Sun Chao
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2504.04210
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2504.04210
Turbulent emulsions are ubiquitous in chemical engineering, food processing, pharmaceuticals, and other fields. However, our experimental understanding of this area remains limited due to the multi-scale nature of turbulent flow and the presence of extensive interfaces, which pose significant challenges to optical measurements. In this study, we address these challenges by precisely matching the refractive indices of the continuous and dispersed phases, enabling us to measure local velocity information at high volume fractions. The emulsion is generated in a turbulent Taylor-Couette flow, with velocity measured at two radial locations: near the inner cylinder (boundary layer) and in the middle gap (bulk region). Near the inner cylinder, the presence of droplets suppresses the emission of angular velocity plumes, which reduces the mean azimuthal velocity and its root mean squared fluctuation. The former effect leads to a higher angular velocity gradient in the boundary layer, resulting in greater global drag on the system. In the bulk region, although droplets suppress turbulence fluctuations, they enhance the cross-correlation between azimuthal and radial velocities, leaving the angular velocity flux contributed by the turbulent flow nearly unchanged. In both locations, droplets suppress turbulence at scales larger than the average droplet diameter and increase the intermittency of velocity increments. However, the effects of the droplets are more pronounced near the inner cylinder than in the bulk, likely because droplets fragment in the boundary layer but are less prone to breakup in the bulk. Our study provides experimental insights into how dispersed droplets modulate global drag, coherent structures, and the multi-scale characteristics of turbulent flow.
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- Type
- preprint
- Language
- en
- Landing Page
- http://arxiv.org/abs/2504.04210
- https://arxiv.org/pdf/2504.04210
- OA Status
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All OpenAlex metadata
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https://doi.org/10.48550/arxiv.2504.04210Digital Object Identifier
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Experimental study of velocity statistics in wall-bounded turbulent emulsionsWork title
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preprintOpenAlex work type
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enPrimary language
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2025Year of publication
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2025-04-05Full publication date if available
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Fan Ya-ning, Zhang, Yi-Bao, Su, Jinghong, Yi Lei, Wang Cheng, Sun ChaoList of authors in order
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https://arxiv.org/abs/2504.04210Publisher landing page
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https://arxiv.org/pdf/2504.04210Direct link to full text PDF
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YesWhether a free full text is available
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greenOpen access status per OpenAlex
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0Total citation count in OpenAlex
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