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Related Concept Videos

Design Example: Flow of Oil Through Circular Pipes01:25

Design Example: Flow of Oil Through Circular Pipes

Understanding fluid flow behavior through pipes is critical in fluid mechanics, especially in applications like oil transportation through pipelines. Hagen-Poiseuille's law provides an exact solution derived from the Navier-Stokes equations for steady, incompressible, and laminar flow within a circular pipe. Hagen-Poiseuille's law helps determine the necessary pressure drop across a pipeline section by determining parameters like pipe length, radius, oil viscosity, and the desired volumetric...
Laminar Flow01:27

Laminar Flow

Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
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Capillarity in Fluid01:19

Capillarity in Fluid

Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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General Characteristics of Pipe Flow I01:22

General Characteristics of Pipe Flow I

Pipe flow refers to the movement of fluids within fully enclosed conduits, typically cylindrical in shape, such as water pipes or hydraulic hoses. These conduits are designed to withstand high-pressure gradients that drive fluid movement, contrasting with open-channel flows, where gravity is the primary driving force. Rectangular conduits, like air conditioning and heating ducts, generally operate at lower pressures and are less suited for high-pressure applications.
The classification of fluid...
General Characteristics of Pipe Flow II01:24

General Characteristics of Pipe Flow II

When fluid enters a pipe, it first passes through the entrance region, where the velocity profile adjusts due to viscous effects. In this region, a boundary layer forms along the pipe walls and grows until it fully occupies the pipe's cross-section. Once the boundary layer merges, the flow becomes fully developed, with a steady velocity profile that remains consistent along the pipe's length.
The distance to reach a fully developed flow is called the entrance length and depends on the flow...

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Updated: Jul 3, 2026

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices
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Enhanced fluid flow through nanoscale carbon pipes.

Max Whitby1, Laurent Cagnon, Maya Thanou

  • 1Chemistry Department, Imperial College, South Kensington, London SW7 2AZ, United Kingdom.

Nano Letters
|August 6, 2008
PubMed
Summary

Fluid flow in larger carbon nanopipes shows significantly enhanced transport, up to 45 times faster than predicted. This study investigates water, ethanol, and decane flow dynamics in amorphous carbon structures.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Nanotechnology

Background:

  • Conventional theories underpredict fluid flow in nanoscale pores.
  • Previous studies focused on pores smaller than 10 nm, observing flow 10,000-100,000 times faster than predicted.
  • Understanding fluid transport in larger nanopores is crucial for various applications.

Purpose of the Study:

  • To experimentally investigate fluid flow in larger diameter (approx. 43 nm) carbon nanopipes.
  • To compare the flow rates of different fluids (water, ethanol, decane) within these structures.
  • To determine if enhanced transport phenomena observed in smaller pores extend to larger diameters.

Main Methods:

  • Fabrication of amorphous carbon nanopipes using a single-step ethylene vapor deposition in alumina templates.
  • Experimental measurement of pressure-driven flow rates for water, ethanol, and decane through the fabricated nanopipes.
  • Comparison of experimental flow rates with predictions from conventional fluid dynamics theory.

Main Results:

  • Observed enhanced fluid transport up to 45 times greater than theoretical predictions for water, ethanol, and decane.
  • Found that decane exhibited faster flow rates than water in these larger nanopipes, contrasting with some previous findings in smaller systems.
  • Successfully fabricated amorphous carbon nanopipes with an inner diameter of 43 +/- 3 nm.

Conclusions:

  • Enhanced fluid transport is not limited to sub-10 nm pores and is significant in larger (43 nm) carbon nanopipes.
  • The relative flow rates of different fluids can vary depending on pore size and fluid properties.
  • The single-step fabrication method provides a viable route for producing carbon nanopipes for studying fluid transport phenomena.