Experimental Evidence of the Kraichnan Scalar Spectrum at High Reynolds Numbers
Experimental Evidence of the Kraichnan Scalar Spectrum at High Reynolds Numbers
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DOI：
10.1175/jpo-d-11-0214.1
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发表时间：
2012-10-01
影响因子：
3.5
通讯作者：
Domaradzki, J. A.
中科院分区：
文献类型：
--
作者：
Bogucki, D. J.;Luo, H.;Domaradzki, J. A.
在一个25 m X 12 m X 3 m的淡水混合游泳池中进行了水平温度梯度光谱测量。相关的流动雷诺数在4 × 10(3)到6 × 10(3)之间变化。在所有分析的情况下，在大波数k下，温度梯度谱表现出与Kraichnan谱形式一致的行为：类似于exp[- (6q(k))(1/2)k]，常数q(k)近似于5.26。这些测量结果与Bogucki等人对Pr近似为7的被动标量流的直接数值模拟以及Sanchez等人最近的实验观测结果相一致。
Measurements of horizontal temperature gradient spectra were carried out in a 25 m X 12 m X 3 m freshwater well mixed swimming pool. The associated flow Reynolds number was found to vary from 4 X 10(3) to 6 x 10(3). In all analyzed cases, at large wavenumbers k, the temperature gradient spectra exhibited behavior consistent with the Kraichnan spectral form: similar to exp[- (6q(k))(1/2)k] with constant q(K) approximate to 5.26. The measurements are in agreement with direct numerical simulations of a passive scalar flow with Pr approximate to 7 of Bogucki et al. and with recent experimental observations of Sanchez et al.