SLIP VELOCITY OF RIGID FIBERS IN A TURBULENT CHANNEL FLOW

Lihao Zhao, C. Marchioli, H. Andersson
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引用次数: 61

Abstract

In this study, the slip velocity between rigid fibers and a viscous carrier fluid is investigated for the reference case of turbulent channel flow. The statistical moments of the slip velocity are evaluated modelling fibers as prolate spheroids with Stokes number, St, ranging from 1 to 100 and aspect ratio, λ, ranging from 3 to 50. Statistics are compared one-to-one with those obtained for spherical particles (λ = 1) to highlight effects due to fiber elongation. Comparison is also made at different Reynolds numbers (Reτ =150, 180, and 300 based on the fluid shear velocity) to discuss effects due to an increase of turbulent fluctuations. Results show that elongation has a quantitative effect on slip velocity statistics, particularly evident for fibers with small St. As St increases, differences due to the aspect ratio tend to vanish and the relative translational motion between individual fibers and surrounding fluid is controlled by fiber inertia through preferential concentration. A clear manifestation o...
湍流通道中刚性纤维的滑移速度
本文以湍流通道流动为参考,研究了刚性纤维与粘性载体流体之间的滑移速度。将纤维建模为斯托克斯数St为1 ~ 100,长径比λ为3 ~ 50的长形球体,计算滑移速度的统计矩。统计数据与球形颗粒(λ = 1)的统计数据进行了一对一的比较,以突出纤维伸长的影响。在不同雷诺数(基于流体剪切速度的Reτ =150、180和300)下也进行了比较,讨论湍流波动增加所带来的影响。结果表明,伸长率对滑移速度统计有定量影响,特别是对于St较小的纤维而言,随着St的增大,长径比的差异趋于消失,单个纤维与周围流体之间的相对平移运动由纤维惯性通过优先集中控制。这是……的明显表现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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