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Related Concept Videos

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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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

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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...
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Related Experiment Video

Updated: Sep 14, 2025

Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices
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Competition and Synergy in Programmable Open Microfluidics: Thermal Fields vs Structural Heterogeneities.

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
Summary
This summary is machine-generated.

This study introduces programmable microfluidics using structured surfaces and thermal fields for precise liquid control. The synergy enhances liquid manipulation, enabling advanced applications in diagnostics and synthesis.

Keywords:
Functional SurfacesLiquid ManipulationProgrammable MicrofluidicsSmart MaterialsThermal FieldsWettability

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Area of Science:

  • Microfluidics
  • Surface Science
  • Materials Science

Background:

  • Open microfluidics commonly uses external fields (magnetic, optical, electrical, thermal) for liquid manipulation.
  • Thermal fields offer simplicity but their interaction with surface structures is underexplored.

Purpose of the Study:

  • To develop a programmable microfluidic platform using heterogeneous structured surfaces and thermal fields.
  • To investigate the interplay between thermal fields and surface structure for tunable liquid transport.
  • To demonstrate advanced microfluidic operations for diagnostic and synthetic applications.

Main Methods:

  • Grafting thermoresponsive macromolecules onto heterogeneous structured surfaces.
  • Utilizing global and local thermal fields to control surface wettability.
  • Analyzing asymmetric interfacial forces for directional liquid transport.
  • Employing localized heating for programmable liquid patterning and reaction cascades.

Main Results:

  • Demonstrated tunable directional liquid transport via thermo-mediated wettability.
  • Revealed a synergistic mechanism between local thermal fields and structural effects.
  • Significantly enhanced antigravity transport critical angle from 2.3° to 41.8°.
  • Achieved programmable liquid patterns and cascade chemical reactions using localized heating.

Conclusions:

  • Programmable microfluidic platforms with thermoresponsive surfaces offer precise control over liquid motion.
  • The synergy between thermal fields and structural effects greatly improves liquid operation performance.
  • This approach advances thermal-regulated microfluidics for potential diagnostic and synthetic applications.