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相关概念视频

Fluid Pressure01:14

Fluid Pressure

In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific weight or...
Accelerating Fluids01:17

Accelerating Fluids

When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
Fluid Movement Between Compartments01:18

Fluid Movement Between Compartments

The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
Steady, Laminar Flow Between Parallel Plates01:17

Steady, 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.

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相关实验视频

Updated: Jun 5, 2026

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

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声音控制的流体处理器处理器.

Hengjia Zhu1, Qiyu Deng1, Junzhi Li2

  • 1Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR 999077, P.R. China.

Science advances
|May 7, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种声控流体处理器,用于无接触式液体处理. 它可以在没有污染的情况下实现精确的微流体功能,保持生物医学和化学应用的样品完整性.

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A Microfluidic Platform for Precision Small-volume Sample Processing and Its Use to Size Separate Biological Particles with an Acoustic Microdevice
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Assembly and Operation of an Acoustofluidic Device for Enhanced Delivery of Molecular Compounds to Cells
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科学领域:

  • 生物技术是生物技术.
  • 化学工程是化学工程的重要组成部分.
  • 物理 物理学 物理

背景情况:

  • 处理液体往往会导致残留物形成,损害精度和纯度.
  • 无接触方法对于处理敏感的生物和化学样品至关重要.
  • 现有的技术可能无法提供足够的控制或保存样品完整性.

研究的目的:

  • 开发一种声控流体处理器,用于无接触式液体处理.
  • 为了能够精确控制微流体功能,如移动,合并,混合和裂变.
  • 为处理具有不同表面张力和体积的液体提供一个多功能平台.

主要方法:

  • 创建一个声度力场.声度力场.
  • 使用声波以无接触的方式操纵滴水.
  • 用从纳米升到毫升的液滴来展示微流体功能.

主要成果:

  • 成功无接触操纵液体的表面张力从17.9到72mN/m.
  • 精确控制滴滴的运动,融合,混合和裂变.
  • 在流体操作过程中证明了样品完整性的保存.

结论:

  • 声控流体处理器为微流体操纵提供了一种全新的无接触式方法.
  • 这种技术适用于广泛的液体体积和表面张力.
  • 它具有很大的潜力,可以推进需要高精度和样品保存的生物医学和化学实践.