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相关概念视频

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

340
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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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in...
1.3K

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相关实验视频

Updated: Sep 14, 2025

Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices
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Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices

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可编程开放微流体的竞争和协同作用:热场与结构异质性对比

Jiaqi Miao1, Jingxuan Li1, Alan C H Tsang1

  • 1Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China.

Nano letters
|July 18, 2025
PubMed
概括

本研究介绍了可编程的微流体学,使用结构化表面和热场来精确控制液体. 协同作用增强了液体操纵,使诊断和合成中的先进应用成为可能.

科学领域:

  • 微流体学 微流体学
  • 表面科学是一门学科.
  • 材料科学 材料科学 材料科学

背景情况:

  • 开放式微流体通常使用外部场 (磁,光,电,热) 来处理液体.
  • 热场提供了简单性,但它们与表面结构的相互作用尚未得到充分探索.

研究的目的:

  • 开发一个可编程的微流体平台,使用异质结构表面和热场.
  • 研究可调节液体运输的热场和表面结构之间的相互作用.
  • 展示用于诊断和合成应用的先进的微流体操作.

主要方法:

  • 将热敏宏分子移植到异质结构的表面上.
  • 利用全球和本地热场来控制表面的湿透性.
  • 分析指向液体运输的不对称界面力.
  • 采用局部加热用于可编程的液体图案和反应级联.

主要成果:

  • 通过热介导可湿性证明可调节的定向液体运输.
  • 揭示了局部热场和结构效应之间的协同作用机制.
  • 显著增强反重力运输的临界角度从2.3°到41.8°.
  • 使用局部加热实现了可编程的液体模式和级联化学反应.
关键词:
功能性表面 功能性表面液体操纵 液体操纵是什么可编程的微流体学智能材料是一种智能材料.热场 热场是一种热场.湿透性 湿透性 湿透性

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Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
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Analyzing Mixing Inhomogeneity in a Microfluidic Device by Microscale Schlieren Technique
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相关实验视频

Last Updated: Sep 14, 2025

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Microfluidic Chips Controlled with Elastomeric Microvalve Arrays
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Microfluidic Chips Controlled with Elastomeric Microvalve Arrays

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结论:

  • 具有热反应表面的可编程微流体平台可以精确控制液体运动.
  • 热场和结构效应之间的协同作用大大提高了液体操作性能.
  • 这种方法使热调节微流体在潜在的诊断和合成应用中取得了进展.