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首页> 外文期刊>International Journal of Heat and Mass Transfer >Frequency Response Of An Electrochemical Probe To The Wall Shear Stress Fluctuations Of A Turbulent Channel Flow
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Frequency Response Of An Electrochemical Probe To The Wall Shear Stress Fluctuations Of A Turbulent Channel Flow

机译：电化学探针对湍流通道壁剪应力波动的频率响应

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摘要

We analyzed numerically the frequency response of the mass transfer rates produced at the surface of an electrochemical probe to the fluctuations of the wall shear stress obtained from a direct numerical simulation of a turbulent plane channel flow at Re_τ = 150. At low and high frequencies the response to the turbulent wall shear stress is in accordance with the existing relations between the amplitudes of the wall shear stress and the mass transfer rates obtained for harmonic perturbations. At intermediate frequencies the turbulent wall shear stress fluctuations produce a larger damping in comparison with the harmonic perturbations. The phase angle of the response of mass transfer rates with respect to the wall shear stress shows important deviations in comparison with the phase angle obtained with harmonic perturbations, specially at high frequencies.
机译：我们从数值上分析了电化学探针表面产生的传质速率对壁剪切应力波动的频率响应，该频率响应是通过在Re_τ= 150时对湍流平面通道流的直接数值模拟获得的。在低频和高频下，对湍流壁剪切应力的响应是根据壁剪切应力的幅度与谐波扰动获​​得的传质速率之间的现有关系确定的。与谐波扰动相比，在中频处，湍流壁的剪应力波动会产生更大的阻尼。相对于壁切应力，传质速率响应的相角与谐波扰动所获得的相角相比，显示出重要的偏差，特别是在高频下。

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