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Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
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A Multilayer Microfluidic Platform for the Conduction of Prolonged Cell-Free Gene Expression
11:23

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Published on: October 6, 2019

Fluid flow control with transformation media.

Yaroslav A Urzhumov1, David R Smith

  • 1Center for Metamaterials and Integrated Plasmonics, Pratt School of Engineering, Duke University, Durham, North Carolina 27708, USA. yaroslav.urzhumov@duke.edu

Physical Review Letters
|September 10, 2011
PubMed
Summary
This summary is machine-generated.

A novel fluid flow cloak manipulates fluid dynamics around objects using anisotropic porous media. This technology eliminates wake effects and drag, opening possibilities for advanced propulsion systems.

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Area of Science:

  • Fluid dynamics
  • Acoustics
  • Optics

Background:

  • Controlling fluid flow around objects is crucial in various engineering applications.
  • Existing methods often struggle with efficiency and complex flow patterns.
  • Transformation optics provides a framework for manipulating wave propagation, inspiring new approaches.

Purpose of the Study:

  • To introduce a new concept for manipulating fluid flow around three-dimensional bodies.
  • To demonstrate the physical implementation of this concept using anisotropic porous media.
  • To show the potential for eliminating downstream wake and compensating viscous drag.

Main Methods:

  • Utilizing coordinate transformations inspired by transformation optics.
  • Physically implementing the concept with inhomogeneous, anisotropic porous media.
  • Analyzing fluid flow around impermeable objects in free-flowing and porous media.

Main Results:

  • The proposed fluid flow cloak preserves the original flow pattern in the absence of the object.
  • Demonstrated elimination of downstream wake behind the object.
  • Showcased compensation of viscous drag, reducing resistance.

Conclusions:

  • The developed fluid flow cloak offers a novel method for controlling fluid dynamics.
  • This approach has significant implications for reducing drag and potentially enabling new propulsion techniques.
  • The concept bridges principles from transformation optics and fluid mechanics.