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首页> 外文期刊>Physics of fluids >Experimental investigation of turbulent Rayleigh-Benard convection of water in a cylindrical cell: The Prandtl number effects for Pr > 1
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Experimental investigation of turbulent Rayleigh-Benard convection of water in a cylindrical cell: The Prandtl number effects for Pr > 1

机译：圆柱形电池水中湍流瑞利邦对流的实验研究：PR> 1的PRANDTL数效应

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摘要

We report an experimental study of turbulent Rayleigh-Benard convection in a cylindrical cell of aspect ratio unity, focusing on the effects of the Prandtl number (Pr). Purified water was used as the convecting fluid. Five different Pr between 3.58 and 9.40 were achieved by changing the mean temperature of water, and the measurements were carried out over the Rayleigh number range 2.63 x 10(8) <= Ra <= 3.89 x 10(10). Over the present parameter range, the measured Nusselt number Nu is found to scale as Nu similar to Ra-beta with beta = 0.30 and to be independent of Pr. Based on the oscillation period of the measured temperature, the Reynolds number Re scales as Re similar to (RaPr-0.72)-Pr-0.47. The local temperature fluctuations at the cell center and near the cell's sidewall were measured, and their relations with Ra and Pr were studied. Our results further reveal that the non-Oberbeck-Boussinesq effects of water have a relatively small influence on the measured scaling relation Nu similar to Ra-beta.
机译：我们在纵横比统一圆柱形电池中举报了湍流瑞利 - Benard对流的实验研究，专注于Prandtl号（PR）的效果。用纯净的水作为对流流体。通过改变水的平均温度来实现3.58和9.40之间的五种不同的PR，并且在瑞利数范围内进行测量2.63×10（8）<= Ra <= 3.89×10（10）。在本参数范围内，发现测量的NUSERET NURE NU以与BETA = 0.30的RA-BETA相似并与PR无关。基于测量温度的振荡周期，Reynolds数重新缩放为类似于（RapR-0.72）-PR-0.47。测量细胞中心和电池侧壁附近的局部温度波动，研究了与Ra和Pr的关系。我们的结果进一步揭示了水的非Oberbeck-Boussinesq效应对测量的缩放关系与Ra-β类似的影响相对较小。

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    《Physics of fluids》 |2020年第1期|共8页
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  • 正文语种 eng
  • 中图分类 流体力学;
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