Assessment of horizontal velocity fields in square thermal convection cells with large aspect ratio
Assessment of horizontal velocity fields in square thermal convection cells with large aspect ratio
复制标题
大纵横比方形热对流单元水平速度场评估
DOI：
10.1007/s00348-018-2626-9
复制
发表时间：
2018
影响因子：
2.4
通讯作者：
Schumacher
中科院分区：
文献类型：
--
作者：
Kästner;Christian;Resagk;Christian;Westphalen;Jasper;Junghähnel;Manuela;Cierpka;Christian;Schumacher
摘要将涂有透明导电金属氧化物的玻璃制成透明加热板，应用于大纵横比湍流Rayleigh-Bénard对流（RBC）中，利用光流测量技术研究了整个水平截面上的大尺度速度场分布。在缩放对流气流实验室实验（SCALEX）设施内测试了纵横比为Γ=L/h= 10的方形对流单元，该设施使得能够在高达10 bar的压力下使用气体作为工作流体进行实验，以实现非常高的瑞利数Ra。对于当前研究，采用Ra= 2 × 104。用2D 3C粒子图像测速仪（PIV）测量了流场。在SCALEX设施中证明了在可重复的均匀温度边界条件下进行可靠PIV测量的可能性。示踪粒子的播种，他们的照明和数据评估的详细说明。实验数据和数值模拟的最后比较表明，水平速度分量的概率密度函数的协议。详细讨论了垂直面外速度分量的偏差及其对激光片厚度的依赖性，并通过测量不同厚度的光片进行了量化。图形摘要
AbstractTransparent heating plates, consisting of glass coated with a transparent conductive metal oxide, are applied in large aspect ratio turbulent Rayleigh–Bénard convection (RBC) to investigate the large-scale patterns of velocity fields with optical flow measurement techniques across the whole horizontal cross section. The square convection cell with an aspect ratioΓ=L/h= 10 was tested inside the scaled convective airflow laboratory experiment (SCALEX) facility which enables experiments with gases as working fluids for pressures of up to 10 bar to achieve very high Rayleigh numbersRa. For the current study,Ra= 2 × 104was applied. The velocity fields are measured with 2D3C particle image velocimetry (PIV). The possibility of reliable PIV measurements with reproducible homogenous temperature boundary conditions was demonstrated in the SCALEX facility. The seeding of the tracer particles, their illumination and data evaluation are addressed in detail. The final comparison of experimental data and numerical simulations shows a good agreement for the probability density functions of the horizontal velocity components. Deviations for the vertical out-of-plane velocity component and their dependence on the thickness of the laser sheet are discussed in detail and quantified by measurements with light sheets of different thickness.Graphical abstract
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影响因子：
2.4
作者：
B. Wieneke
通讯作者：
B. Wieneke
基于 Tomo-PIV 和 PIT 组合的湍流 Rayleigh-Bénard 对流中的速度和温度同步测量
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
D. Schiepel;D. Schmeling;C. Wagner
通讯作者：
C. Wagner
影响因子：
3.8
作者：
B. Fond;Christopher Abram;A. Heyes;A. Kempf;F. Beyrau
通讯作者：
B. Fond;Christopher Abram;A. Heyes;A. Kempf;F. Beyrau
影响因子：
2.1
作者：
Abram, Christopher;Fond, Benoit;Beyrau, Frank
通讯作者：
Beyrau, Frank
影响因子：
1.9
作者：
Minami, T
通讯作者：
Minami, T