在融化吹风过程中对空气流场和纤维运动的实验研究
Wenhan Wu1, Wanli Han1, Yafeng Sun2
1College of Material and Textile, Jiaxing University, Jiaxing 314000, China.
Polymers
|February 24, 2024
概括
这项研究揭示了化吹风空气流如何影响纤维运动和衰减. 优化空气流和纤维动态是控制无布属性的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 流体动力学 流体动力学
- 聚合物加工 聚合物加工
背景情况:
- 化吹风工艺对于生产无布至关重要.
- 纤维衰减对化材料的最终性能产生重大影响.
- 了解空气流和光纤运动之间的相互作用对于流程优化至关重要.
研究的目的:
- 为了实验性地研究三维空气流场和纤维运动在化吹槽模具中.
- 分析空气流分布的特征及其对光纤运动的影响.
- 为了确定空气流参数,纤维运动和纤维衰减之间的关系.
主要方法:
- 热线气流测量用于测量三维空气流场.
- 一个高速摄像机被用来在线捕捉光纤运动.
- 进行了空气流分布,纤维振幅和纤维形态的分析.
主要成果:
- 融化吹风空气流场以高速度 (130-160 m/s) 在模具面附近不对称地分布.
- 纤维振幅随着空气分散面积的增加而增加,显著影响纤维衰减.
- 纤维从直线段过渡到曲环,影响运动和粘合.
结论:
- 空气流速,速度差和分散面积直接影响纤维运动.
- 纤维运动特性,包括曲和循环形成,对于纤维衰减至关重要.
- 这项研究提供了对优化化吹工艺的见解,以获得所需的非织物特性.
相关概念视频
01:07Laminar and Turbulent Flow
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the streamlines...
01:17Steady, Laminar Flow Between Parallel Plates
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
01:22Couette Flow
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
01:23Steady, Laminar Flow in Circular Tubes
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
01:24Turbulent Flow
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent spots,...
01:26General External Flow Characteristics
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...