Numerical study on the mechanism of drag modulation by dispersed drops in two-phase Taylor-Couette turbulence
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866907802765623296 |
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| author | Su, Jinghong Yi, Lei Zhao, Bidan Wang, Cheng Xu, Fan Wang, Junwu Sun, Chao |
| author_facet | Su, Jinghong Yi, Lei Zhao, Bidan Wang, Cheng Xu, Fan Wang, Junwu Sun, Chao |
| contents | The presence of a dispersed phase can significantly modulate the drag in turbulent systems. We derived a conserved quantity that characterizes the radial transport of azimuthal momentum in the fluid-fluid two-phase Taylor-Couette turbulence. This quantity consists of contributions from advection, diffusion, and two-phase interface, which are closely related to density, viscosity, and interfacial tension, respectively. We found that the presence of the two-phase interface consistently produces a positive contribution to the momentum transport and leads to drag enhancement, while decreasing the density and viscosity ratios of the dispersed phase to the continuous phase reduces the contribution of local advection and diffusion terms to the momentum transport, respectively, resulting in drag reduction. Therefore, we concluded that the decreased density ratio and the decreased viscosity ratio work together to compete with the presence of two-phase interface for achieving drag modulation in fluid-fluid two-phase turbulence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_08098 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Numerical study on the mechanism of drag modulation by dispersed drops in two-phase Taylor-Couette turbulence Su, Jinghong Yi, Lei Zhao, Bidan Wang, Cheng Xu, Fan Wang, Junwu Sun, Chao Fluid Dynamics The presence of a dispersed phase can significantly modulate the drag in turbulent systems. We derived a conserved quantity that characterizes the radial transport of azimuthal momentum in the fluid-fluid two-phase Taylor-Couette turbulence. This quantity consists of contributions from advection, diffusion, and two-phase interface, which are closely related to density, viscosity, and interfacial tension, respectively. We found that the presence of the two-phase interface consistently produces a positive contribution to the momentum transport and leads to drag enhancement, while decreasing the density and viscosity ratios of the dispersed phase to the continuous phase reduces the contribution of local advection and diffusion terms to the momentum transport, respectively, resulting in drag reduction. Therefore, we concluded that the decreased density ratio and the decreased viscosity ratio work together to compete with the presence of two-phase interface for achieving drag modulation in fluid-fluid two-phase turbulence. |
| title | Numerical study on the mechanism of drag modulation by dispersed drops in two-phase Taylor-Couette turbulence |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2310.08098 |