相关实验视频
Updated: Sep 19, 2025
10:49
Power Input Measurements in Stirred Bioreactors at Laboratory Scale
Published on: May 16, 2018
18.0K
超时的划船在雷诺兹数变化的四个数量级上提供了强大的推进性能
Mitchell P Ford1, Arvind Santhanakrishnan1
1School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK, USA.
Journal of the Royal Society, Interface
|June 3, 2025
概括
多种动物使用的游泳方法 - - 超时,在不同的流体流动条件下表现一致. 游泳速度与的冲击率线性变化,不论粘度如何.
科学领域:
- 流体动力学 流体动力学
- 生物力学 生物力学
- 机器人技术 机器人技术 机器人技术
背景情况:
- 超时的划船是跨不同种类的共同游泳策略.
- 生物体的大小差异很大,导致了广泛的流体流动模式 (雷诺德数从10^-2到10^4).
- 在这个雷诺兹数范围内的元时代划船的水力动力学可扩展性尚未得到充分理解.
研究的目的:
- 为了研究超时划船的水力动力学可扩展性.
- 为了检查与甲类动物相关的雷诺兹数的广泛范围内的游泳表现.
- 为了了解液体粘度如何影响超时的划船动力学.
主要方法:
- 使用了一种自动驾驶的超时代划机器人.
- 在雷诺兹数 (10^0到10^4) 的四个数量级变化中测试了游泳表现.
- 分析了Strohal数和尖流的循环.
主要成果:
- 在测试的雷诺兹数范围 (10^0到10^4) 中,Wake Strouhal数保持不变.
- 尖旋循环与冲动动力学线性增加,独立于液体粘度.
- 在所有测试条件下,无维的游泳速度与冲动动力学线性缩放.
结论:
- 在广泛的流体流动模式中,超时的划船性能保持不变.
- 这些发现为水生动物运动的基本原则提供了洞察力.
- 这项研究弥合了生物观测和机器人复制游泳之间的差距.
相关概念视频
01:10Poiseuille's Law and Reynolds Number
7.0K
Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
7.0K
01:24Rapidly Varying Flow
146
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
146
01:17Steady, Laminar Flow Between Parallel Plates
358
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.
358
01:24Reynolds Transport Theorem
1.4K
The Reynolds transport theorem provides a framework to relate the time rate of change of an extensive property within a system to that in a control volume, which is crucial for analyzing fluid dynamics. Extensive properties, such as mass, velocity, acceleration, temperature, and momentum, can be expressed in terms of the mass of a fluid portion. These properties are called extensive because they depend on the system's size, while intensive properties are their corresponding values per unit...
1.4K
01:15Dimensionless Groups in Fluid Mechanics
447
Dimensionless groups in fluid mechanics provide simplified ratios that help analyze fluid behavior without relying on specific units. The Reynolds number (Re), which represents the ratio of inertial to viscous forces, distinguishes between laminar and turbulent flows, making it essential in the design of pipelines and aerodynamic surfaces. The Froude number (Fr), the ratio of inertial to gravitational forces, is particularly useful in predicting wave formation and hydraulic jumps in...
447
01:30Typical Model Studies
448
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.
448