水力动力滑系统中的薄膜:奥西里斯摩擦设置
Cedric Barazzutti1, Juliette Cayer-Barrioz1, Denis Mazuyer1
1Laboratoire de Tribologie et Dynamique des Systèmes, CNRS UMR 5513, École Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France.
The Review of scientific instruments
|October 20, 2023
概括
开发了一种新的水力动力滑试管计,用于研究薄膜中的摩擦. 它揭示了表面纹理和流体层如何影响滑性能.
科学领域:
- 部落学 (tribology) 是一个学科.
- 流体力学 流体力学 流体力学
- 表面科学是一门学科.
背景情况:
- 水力动力滑对于减少机械的摩擦和磨损至关重要.
- 由于复杂的现象,理解用低粘度流体进行薄膜滑具有挑战性.
- 表面效应显著影响滑性能,但其精确作用尚未完全理解.
研究的目的:
- 开发和验证一种新的水力动力滑试管计,用于研究薄膜滑.
- 分析低粘度流体中的水力动力摩擦机制.
- 阐明表面效应 (包括地形和吸附层) 对滑的作用.
主要方法:
- 开发了一种特殊的水力动力学期刊,配备带有5μm辐射空隙的三角计.
- 在现场同时测量薄膜厚度,化区域,摩擦扭矩,温度和轴位置.
- 在各种条件下进行测试,包括光滑和纹理的表面,速度高达12,000rpm.
主要成果:
- 三角仪成功测量了薄膜特性和摩擦.
- 热效应,加速和惯性被量化和讨论.
- 表面地形 (纹理) 和吸附的液体层明显影响了滑性能.
结论:
- 开发的杆计是研究薄膜水力动力滑的有能力的工具.
- 表面地形和流体配方诱导的吸附层在滑机制中发挥着重要作用.
- 进一步的研究可以利用这种设置来优化滑剂配方和表面设计,以提高 Tribological 性能.
相关概念视频
01:23Design Example: Deciding Thickness of Lubricating Fluid in a Shaft
116
Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular...
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular...
116
01:21Characteristics of Dry Friction
601
Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
601
01:17Steady, Laminar Flow Between Parallel Plates
205
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.
205
01:07Frictional Force
8.1K
When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
8.1K
01:30Dry Friction
399
Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
399
01:05Static and Kinetic Frictional Force
16.0K
One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
However, if two systems are in contact and are stationary relative to one...
16.0K