King Eric M, Aurnou Jonathan M
Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Jan;85(1 Pt 2):016313. doi: 10.1103/PhysRevE.85.016313. Epub 2012 Jan 18.
We investigate flow structures in rotating Rayleigh-Bénard convection experiments in water using thermal measurements. We focus on correlations between time series measurements of temperature in the top and bottom boundaries. Distinct anticorrelations are observed for rapidly rotating convection, which are argued to attest to heat transport by convective Taylor columns. In support of this argument, these quasigeostrophic flow structures are directly observed in flow visualizations, and their thermal signature is qualitatively reproduced by a simple model of heat transport by columnar flow. Weakly rotating and nonrotating convection produces positively correlated temperature changes across the layer, indicative of heat transport by large-scale circulation. We separate these regimes using a transition parameter that depends on the Rayleigh and Ekman numbers, RaE3/2.
我们利用热测量方法，对水中旋转瑞利 - 贝纳德对流实验中的流动结构进行了研究。我们重点关注顶部和底部边界温度的时间序列测量之间的相关性。在快速旋转对流中观察到了明显的反相关性，据认为这证明了对流泰勒柱的热传输。为支持这一论点，在流动可视化中直接观察到了这些准地转流动结构，并且通过柱状流热传输的简单模型定性地再现了它们的热特征。弱旋转和非旋转对流在整个层中产生正相关的温度变化，这表明是由大规模环流进行热传输。我们使用一个取决于瑞利数和埃克曼数的过渡参数RaE3/2来区分这些状态。
