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首页> 外文期刊>International Journal of Multiphase Flow >Effects of particle arrangements on the drag force of a particle in the intermediate flow regime
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Effects of particle arrangements on the drag force of a particle in the intermediate flow regime

机译：中间流态下颗粒排列对颗粒阻力的影响

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摘要

The drag force of a single particle in the presence of other equal-sized particles arranged in specific configurations is measured directly for Re from 30 to 106. Four particle arrangements are investigated: a two-particle configuration (Model I), a three-coaligned particle configuration (Model II), a hexagonal particle configuration (Model III) and a cubic particle configuration (Model IV). Variables studied include the particle Reynolds number (Re) and the separation distance. The effect of pipe wall on the measurement results is also examined. The measured drag force, expressed in terms of the drag ratio, is compared with the theoretical values at zero Re and the experimental values for 100 < Re < 103 reported in the literature. Comparisons of the experimentally determined drag ratios with numerically simulated values are also conducted. Because of the Re effect, the drag ratio curves for Model I are no longer symmetrical with respect to = 90° as observed for the Stokes flow. The results for Model I at = 90° show that the drag ratio increases with the separation distance and then decreases with further increasing separation distance, and the combination of the Re and wall effects causes the drag ratios higher than unity. For Model II, the drag ratio of the middle particle is lower than that of the upper particle at small separation distances but becomes slightly higher beyond a certain separation distance. The computational results provide detailed information on the flow field around each particle, and the pressure and the shear stress distributions on particle surfaces. The numerically simulated drag ratios compare reasonably well with the experimental data. The drag ratio behavior for Model IV is found to be similar to Models I and III; however, the Re does not seem to affect the drag ratio. The results of the flow visualization conducted in this study clearly demonstrate a significant change of the wake structure of Models I and III at different separation distances.
机译：直接测量存在于特定构型中的其他均等尺寸的颗粒时，单个颗粒的阻力，其Re从30到106。研究了四个颗粒的布置：两个颗粒的构型（模型I），三个同向的颗粒配置（模型II），六边形颗粒配置（模型III）和立方颗粒配置（模型IV）。研究的变量包括粒子雷诺数（Re）和分离距离。还检查了管壁对测量结果的影响。将以阻力比表示的测得的阻力与零Re时的理论值和文献中报道的100

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