Alignment of carbon fiber and PDMS mixture flowing in 90° elbow channel

IF 3.6 2区 工程技术 Q1 MECHANICS International Journal of Multiphase Flow Pub Date : 2023-08-01 DOI:10.1016/j.ijmultiphaseflow.2023.104470
Hoang Minh Khoa Nguyen, Dong-Wook Oh
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Abstract

In this study, flow visualization experiments and computational fluid dynamics simulations are conducted to analyze the rotation of carbon fibers flowing in a 90° elbow channel. In the corner of the 90° elbow channel, a directional change in velocities and velocity gradients results in the rotation of the fibers from a horizontal to vertical alignment. To analyze the fiber rotation, a mixture comprising uncured polydimethylsiloxane and ball-milled carbon fibers is utilized as the working fluid in a flow visualization experiment. The velocity and velocity gradients inside the channel are calculated via computational fluid dynamics simulation and then compared with the angular changes in the fiber rotation along different trajectories inside the elbow corner. A Lagrangian approach using a local coordinate system to trail each fiber along the trajectory is utilized to compare the effects of shear rate on fiber rotation. It is discovered that the fibers are affected by a relatively high local shear rate, and that they propagate with the flow, indicating a parallel alignment in the flow direction while exhibiting a 90° turn at the elbow corner.

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碳纤维与PDMS混合物在90°弯头通道内流动的对准
本文通过流动可视化实验和计算流体力学模拟,分析了碳纤维在90°弯头通道中的旋转情况。在90°弯头通道的拐角处,速度和速度梯度的方向变化导致纤维从水平方向旋转到垂直方向。为了分析纤维的旋转,采用未固化聚二甲基硅氧烷和球磨碳纤维的混合物作为流动可视化实验的工作流体。通过计算流体力学模拟计算了通道内的速度和速度梯度,并与弯角内纤维沿不同轨迹旋转时的角度变化进行了比较。采用拉格朗日方法,利用局部坐标系跟踪每根纤维沿轨迹,比较剪切速率对纤维旋转的影响。研究发现,纤维受到相对较高的局部剪切率的影响,并且它们随流动传播,表明在流动方向上平行排列,同时在弯角处表现出90°转弯。
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来源期刊
CiteScore
7.30
自引率
10.50%
发文量
244
审稿时长
4 months
期刊介绍: The International Journal of Multiphase Flow publishes analytical, numerical and experimental articles of lasting interest. The scope of the journal includes all aspects of mass, momentum and energy exchange phenomena among different phases such as occur in disperse flows, gas–liquid and liquid–liquid flows, flows in porous media, boiling, granular flows and others. The journal publishes full papers, brief communications and conference announcements.
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