Experimental Study of Two-Phase Turbulent Wake Using PIV Technique

Q3 Engineering Multiphase Science and Technology Pub Date : 2023-01-01 DOI:10.1615/multscientechn.2023047622

Keh Chin Chang, Wei-Cheng Chen

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Abstract

Turbulent wake flows laden with the particles in mean size of 55 μm under the conditions of four mass loading ratios (0, 1, 3 and 5%, corresponding to the dispersed-phase volume fractions of 1.248×〖10〗^(-6), 3.743×〖10〗^(-6) and 6.241×〖10〗^(-5) for the last three cases, respectively) and two Reynolds numbers are studied in near-wake regions by means of a two-phase particle image velocimetry (PIV) technique. A complicated manner for variations of turbulence intensity: both suppression and enhancement as compared to that of the single-phase flow is observed in the flow field for each particle-laden case and no definite correlation for turbulence-intensity modulation with respect to the parameters of mass loading ratio (α) and Reynolds number ( 〖Re〗_d) can be drawn from the experimental results. Nevertheless, attenuation of the turbulent mixing capability is observed through the addition of particles in the wake and their weakened extent is increased with the increment of mass loading ratio in both cases of different Reynolds numbers. In contrast to the turbulence modulation, the turbulent dispersion effect for the particles is increased with the increment of either α and 〖Re〗_d.

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两相湍流尾流的PIV实验研究

湍流尾流流满了粒子的平均尺寸55μm的条件下四个质量负载比率(0、1、3和5%,相应的美国分散相体积分数为1.248×10〗^(6),美国3.743×10〗^(6)和美国6.241×10〗^(5)在过去的三个案例,分别)和两个研究雷诺数near-wake地区通过一个两阶段的粒子图像测速技术(PIV)技术。实验结果表明，与单相流相比，不同颗粒流场的湍流强度变化有抑制和增强的趋势，且湍流强度调制与质量加载比(α)和雷诺数(〖Re〗_d)参数之间没有明确的相关性。然而，在不同雷诺数的情况下，尾迹中加入颗粒会导致湍流混合能力的衰减，并且随着质量加载比的增加，其减弱程度都有所增加。与湍流调制相反，粒子的湍流色散效应随α和〖Re〗_d的增加而增加。

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来源期刊

Multiphase Science and Technology Engineering-Engineering (all)

CiteScore

0.80

自引率

0.00%

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期刊介绍： Two-phase flows commonly occur in nature and in a multitude of other settings. They are not only of academic interest but are found in a wide range of engineering applications, continuing to pose a challenge to many research scientists and industrial practitioners alike. Although many important advances have been made in the past, the efforts to understand fundamental behavior and mechanisms of two-phase flow are necessarily a continuing process. Volume 8 of Multiphase Science and Technology contains the text of the invited lectures given at the Third International Workshop on Two-Phase Flow Fundamentals sponsored by the Electric Power Research Institute (EPRI) and the U. S. Department of Energy (DOE).