莱登弗罗斯特钢球在水面上的反弹
Chin-Chi Hsu1, Shih-Hsien Cheng1, Yu-Feng Ko1
1Department of Mechanical Engineering, <a href="https://ror.org/04twccc71">National United University</a>, No. 2, Lienda, Miaoli 36063, Taiwan.
Physical review. E
|August 20, 2024
概括
加热的钢球因逆Leidenfrost效应而反弹在水面上,形成一个蒸汽. 这项研究分析了这些独特的反弹过程中的球体运动和力量.
科学领域:
- 物理 物理学 物理
- 流体动力学 流体动力学
- 热力学是一种热力学.
背景情况:
- 莱登弗罗斯特效应描述了一种液体在与非常热的表面接触时蒸发.
- 一个比水密度更高的钢球可以在液体表面上表现出不寻常的反弹行为,当它被加热在Leidenfrost点以上时.
研究的目的:
- 为了研究加热的钢球在水面上反弹的现象.
- 分析不同温度和雷诺兹数的球体的运动行为.
- 为了检查影响球体在自由液体表面反弹行为的力成分.
主要方法:
- 在水面上试验释放加热的钢球.
- 对球体运动动态的观察和分析.
- 评估流体动力学力和热相互作用.
主要成果:
- 加热的钢球在与水接触时会产生蒸汽,使它们能够反弹.
- 观察到相反的Leidenfrost效应,即球从液体表面反射出来.
- 球体运动和反弹特征与温度和雷诺兹数相关.
结论:
- 反向的Leidenfrost效应提供了一种机制,使密集的球体在液体上反弹.
- 了解热力和水力动力学的相互作用是这种现象的关键.
- 这项研究量化了球体在这种独特的物理相互作用中的行为.
相关概念视频
Hydrostatic Pressure Force on a Curved Surface
1.8K
Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
1.8K
Surface Tension of Fluid
255
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
255
Steady, Laminar Flow Between Parallel Plates
157
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.
157
Hydraulic Jump
70
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
70
Fluid Pressure over Flat Plate of Constant Width
2.0K
When a body is submerged in water, it experiences fluid pressure acting normal on its surface and distributed over its area. For better design structures, it is crucial to determine the magnitude and location of the resultant force acting on the surface. In the case of a rectangular plate of constant width submerged in water, the pressure increases with depth, resulting in a linearly varying trapezoidal pressure distribution from the upper to the lower edge of the plate.
The resultant force...
The resultant force...
2.0K
Fluid Pressure over Curved Plate of Constant Width
1.6K
When a curved plate of constant width is submerged in a liquid, the pressure acting normal to the plate varies continuously both in magnitude and direction. Calculating the magnitude and location of the resultant force at a point is often challenging for such cases. One of the methods to determine the resultant force and its location involves separately calculating the horizontal and vertical components of the resultant force. This complex calculation can be simplified by representing the...
1.6K


