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arXiv · 1907.10785

Fine vortex structure and flow transition to the geostrophic regime in rotating Rayleigh-Bénard convection

Jun-Qiang Shi·Hao-Yuan Lu·Shan-Shan Ding·Jin-Qiang Zhong
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Abstract

We present spatial-resolved measurements of the columnar vortex structures in rotating Rayleigh-Bénard convection. The scaled radial profiles of the azimuthal velocity $u_ϕ(r)$ and vertical vorticity $ω(r)$ of the vortices are analyzed and compared with the predictions of the asymptotic theory. The results reveal that the asymptotic theory predicts accurately $u_ϕ(r)$ and $ω(r)$ in the geostrophic convection regime, but extension of the theory in the weak rotation regime is needed to interpret the rotation-dependence of the experimental data. Our measurements of the mean velocity, vorticity of the vortices, and the strength of the vortex shield structure all indicate a flow transition from weekly rotating convection to geostrophic convection. Results of the parameter values for the transition are in agreement with the scaling relationship obtained from previous heat-transfer measurements.

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Jun-Qiang Shi, Hao-Yuan Lu, Shan-Shan Ding, Jin-Qiang Zhong. 2019-07-25. Fine vortex structure and flow transition to the geostrophic regime in rotating Rayleigh-Bénard convection. https://doi.org/10.1103/physrevfluids.5.011501

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