在液体-固体流中对肘部粒子运动和侵蚀行为进行实验研究
Zhenqiang Xie1,2, Xuewen Cao2, Qingping Li1
1China National Offshore Oil Corporation Research Institute, Beijing, 100028, China.
Heliyon
|November 1, 2023
概括
这项研究揭示了粒子如何在液体-固体流中侵蚀管道肘部的内部曲线 (intrados). 先进的成像显示,二次流动导致了意想不到的粒子路径和增加了内部侵蚀,与外部曲线 (外层) 不同.
科学领域:
- 流体力学 流体力学 流体力学
- 材料科学 材料科学 材料科学
- 部落学 (tribology) 是一个学科.
背景情况:
- 管道肘部的侵蚀是工业过程中的一个关键问题.
- 现有研究经常使用缺乏经验数据的计算流体动力学 (CFD).
- 研究主要集中在外侧曲线 (extrados),忽视了内侧曲线 (intrados).
研究的目的:
- 为了研究粒子运动和侵蚀微力学在肘部内.
- 提供对管道肘部液体固体流量侵蚀的全面了解.
- 分析二次流对粒子轨迹和侵蚀模式的影响.
主要方法:
- 利用高速摄像机技术和扫描电子显微镜进行粒子运动和微侵蚀分析.
- 使用减肥方法估计侵蚀率.
- 进行了低速度 (2.5 m/s) 液体-固体流量的实验.
主要成果:
- 从内置物中释放的粒子在60°肘角时显著偏离.
- 颗粒从外置转移到30°的内置.
- 二次流加速粒子,导致轨道偏差和增加内部侵蚀.
- 内装的侵蚀显示上升倾向,而外装则表现出更长,更浅的划痕.
结论:
- 二次流在粒子加速和内部侵蚀中起着关键作用.
- 持续的耕作和材料破裂是显著的侵蚀机制.
- 侵蚀模式因不同撞击角度而在内置和外置之间存在差异.
相关概念视频
01:22Eulerian and Lagrangian Flow Descriptions
1.4K
Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
The Eulerian method focuses on fixed points in space where fluid properties, such as velocity, pressure, and temperature, are observed as the fluid moves between these...
The Eulerian method focuses on fixed points in space where fluid properties, such as velocity, pressure, and temperature, are observed as the fluid moves between these...
1.4K
01:30Typical Model Studies
363
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
363
01:07Laminar and Turbulent Flow
8.6K
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...
8.6K
01:17Steady, Laminar Flow Between Parallel Plates
203
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.
203
01:22Couette Flow
288
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...
288
01:23Introduction to Types of Flows
1.2K
Fluid flows are categorized by dimensionality and behavior, with one-dimensional flow being the simplest form, where properties like velocity and pressure change only along a single axis. Water moving through straight pipes exemplifies this flow type, as variations in other directions are minimal. One-dimensional analysis helps simplify understanding such flows, focusing solely on changes along the pipe's length.
Two-dimensional flow involves changes in both length and height, as seen in...
Two-dimensional flow involves changes in both length and height, as seen in...
1.2K