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Numerical Research on the Fiber Suspensions in a Turbulent T-shaped Branching Channel Flow

ISSN号：1004-9541
期刊名称：《中国化学工程学报：英文版》
时间：0
分类：O362[理学—流体力学;理学—力学] TQ022.4[化学工程]
作者机构：[1]Department of Mechanics, the State Key Laboratory of Fluid Power Transmission and Control, Zhejiang Univerity, Hangzhou 310027, China, [2]China Jiliang University, Hangzhou 310018, China, [3]Institute of Marine and Coastal Sciences, Rutgers University, New Brunswick, New Jersey 08903-0231, USA
相关基金：Supported by the Major Program of the National Natural Science Foundation of China （No. 10632070）

关键词： T型分支管道湍流, 纤维悬浮, 分布, 取向, 数值模拟, fiber suspension, distribution, orientation, turbulent branching channel flow, numerical simulation

中文摘要：

在狂暴的Ｔ形的纤维的集中和取向分叉的隧道流动数字地被调查。雷纳兹和雷纳兹压力平均海军司烧方程狂暴的模型为吝啬的流场和狂暴的动能被解决。液体的波动的速度与其变化与狂暴的动能有关的 Gaussian 作为一个随机的变量被假定。苗条身体的理论被用来基于已知的平均数和液体的波动的速度模仿纤维运动。在低雷纳兹数字，纤维集中在流动分离区域高的结果表演，和在整个隧道的纤维取向广泛地与沿着水平轴排列的细微偏爱被散布。与 Re 增加，高集中区域消失，并且没有任何比较喜欢的方向，纤维取向变得同类。在高级雷纳兹数字，纤维集中沿着流向逐渐地增加。在在不同纤维纵横比之间的集中和取向的分发的差别在低 Re 仅仅是明显的。Re 和纤维纵横比在取向角度的变化上有小效果。

英文摘要：

The concentration and orientation of fiber in a turbulent T-shaped branching channel flow are investigated numerically. The Reynolds averaged Navier-Stokes equations together with the Reynolds stress turbulent model are solved for the mean flow field and the turbulent kinetic energy. The fluctuating velocities of the fluid are assumed as a random variable with Gaussian distribution whose variance is related to the turbulent kinetic energy. The slender-body theory is used to simulate the fiber motion based on the known mean and fluctuating velocities of the fluid. The results show that at low Reynolds number, fiber concentration is high in the flow separation regions, and fiber orientation throughout the channel is widely distributed with a slight preference of aligning along the horizontal axis. With increasing of Re, the high concentration region disappears, and fiber orientation becomes ho- mogeneous without any preferred direction. At high Reynolds number, fiber concentration increases gradually along the flow direction. The differences in the distribution of concentration and orientation between different fiber aspect ratio are evident only at low Re. Both Re and fiber aspect ratio have small effect on the variance of orientation angle.

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