Comparison between 3-D-PTV and 2-D-PIV for determination of hydrodynamics of complex fluids in a stirred vessel
Comparison between 3-D-PTV and 2-D-PIV for determination of hydrodynamics of complex fluids in a stirred vessel
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DOI：
10.1016/j.ces.2017.05.034
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发表时间：
2017-11
影响因子：
4.7
通讯作者：
F. Alberini;Li Liu;E. Stitt;M. Simmons
中科院分区：
文献类型：
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作者：
F. Alberini;Li Liu;E. Stitt;M. Simmons
本文研究了三维粒子跟踪测速技术（PTV）在标准折流板圆柱形容器中测量牛顿流体和非牛顿流体共混流场的能力。结果是基准对传统的2-D粒子图像测速（PIV）数据。直径T = 0.19 m的容器配备有直径D = 0.5 T的6叶片向下泵送PBT叶轮。使用一系列牛顿和非牛顿流体进行了低过渡（Re 70）和过渡（Re 1000）状态的实验。使用牛顿流体进行湍流测量（Re > 20，000）。从这两种技术的数据进行比较，在平均流场，并在适当的情况下，湍流脉动速度分量。特别强调的是如何比较可以在欧拉PIV数据和欧拉-拉格朗日PTV数据。总体结果表明，PTV技术在此应用中获得的平均流场与PIV吻合良好。湍流特性不太好解决PTV部分原因是由于大尺寸的示踪粒子使用。还讨论了PTV与PIV相比的其他优点和局限性。
The capabilities of 3-D-Particle Tracking Velocimetry (PTV) to measure flow fields during the blending of Newtonian and non-Newtonian fluids in a standard baffled cylindrical vessel are assessed. The results are benchmarked against conventional 2-D Particle Image Velocimetry (PIV) data. The vessel, of diameter T = 0.19 m, is equipped with a 6-blade down-pumping PBT impeller of diameter, D = 0.5T. Experiments in the low transitional (Re ∼ 70), and transitional (Re ∼ 1000) regimes have been conducted, using a range of Newtonian and non-Newtonian fluids. Turbulent flow measurements (Re > 20,000) are made using Newtonian fluids. Data from both techniques are compared in terms of average flow field and, where appropriate, turbulent fluctuating velocity components. Particular emphasis is given on how comparisons can be made between the Eulerian PIV data and the Euler-Lagrangian PTV data. The overall results demonstrate the validity of the PTV technique in this application to acquire average flow fields which are in good agreement with PIV. Turbulent flow properties are less well resolved by PTV due in part to the large size of the tracer particle used. Other advantages and limitations of PTV versus PIV are also discussed.