Evaluation of turbulence kinetic energy budget in turbulent flows by using a photobleaching molecular tagging velocimetry
Evaluation of turbulence kinetic energy budget in turbulent flows by using a photobleaching molecular tagging velocimetry
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DOI：
10.1063/1.3694718
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Hiroki Mizumoto;S. Hosokawa;T. Suzuki;A. Tomiyama
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文献类型：
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作者：
Hiroki Mizumoto;S. Hosokawa;T. Suzuki;A. Tomiyama
了解气液两相泡状流中的湍流动能收支对于发展和改进泡状流的湍流模型是必不可少的。为了从实验上评估TKE预算，需要同时测量空间分辨率小于Kolmogorov尺度的速度和速度梯度。因此，我们提出了一种基于光漂白反应的分子标记测速技术(PB-MTV)，并将其应用于方形管道中的湍流流动，以论证评估TKE预算的可能性。虽然在以前的研究中检查了测量的速度和速度梯度的准确性，但由于缺乏关于将军澳支线预算的信息，尚未检查支线支线预算的准确性。在这项研究中，我们利用PB-MTV在与岩本提供的DNS数据相同的湍流雷诺数条件下测量了方形管道中湍动水流中的TKE收支，并将测量数据与DNS数据进行了比较，以验证PB-MTV用于评估TKE收支的有效性。
Understanding turbulence kinetic energy (TKE) budget in gas-liquid two-phase bubbly flows is indispensable to develop and improve turbulence models for the bubbly flows. Simultaneous measurement of velocity and velocity gradients with spatial resolution smaller than the Kolmogorov scale is required to evaluate the TKE budget experimentally. We therefore proposed a molecular tagging velocimetry based on photobleaching reaction (PB-MTV) and applied it to turbulent flows in a square duct to demonstrate the possibility of evaluation of TKE budget. Although the accuracy of measured velocity and velocity gradients were examined in the previous study, the accuracy of the TKE budget has not been examined yet due to lack of information on the TKE budget. In this study, we measure TKE budget in a turbulent water flow in a square duct by using the PB-MTV at the same turbulent Reynolds number condition as DNS data provided by Iwamoto, and compare the measured data with the DNS data to validate PB-MTV for evaluation o...