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Lift is a fundamental aerodynamic force that acts perpendicular to the direction of airflow. It plays a central role in achieving and sustaining flight and in stabilizing various vehicles. Lift primarily originates from pressure differences created across surfaces, such as an airfoil. A lower pressure region forms above the wing, while a higher pressure region forms below it, generating an upward force. This differential results from the shape and orientation of the airfoil, enabling the wing...
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Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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Vortex flows impart chirality-specific lift forces.

Thomas M Hermans1, Kyle J M Bishop2, Peter S Stewart3

  • 1Department of Chemical and Biological Engineering and Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.

Nature Communications
|January 13, 2015
PubMed
Summary
This summary is machine-generated.

Macroscopic vortex flows can separate chiral molecules. This study demonstrates a chirality-specific lift force in a Taylor-Couette cell, offering new micro- and nanoscale chiral separation possibilities.

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Area of Science:

  • Fluid dynamics
  • Chirality studies
  • Separations science

Background:

  • Vortex flows' ability to discriminate between chiral molecules is debated.
  • Previous studies lacked experimental control and were affected by instrumental artifacts.
  • The interaction between vortex flows and stereoisomers remains unresolved.

Purpose of the Study:

  • To investigate the interaction between macroscopic vortex flows and chiral objects.
  • To resolve the controversy surrounding vortex-driven chiral discrimination.
  • To develop a quantitative model for chirality-specific forces in shear flows.

Main Methods:

  • Utilizing a Taylor-Couette cell as a model experimental system.
  • Implementing macroscopic vortex flows to study chiral object behavior.
  • Developing a quantitative hydrodynamic model for non-linear shear flows.

Main Results:

  • Chiral objects in a Taylor-Couette cell experience a chirality-specific lift force.
  • This force is directed parallel to the shear plane, differing from prior observations.
  • A hydrodynamic model explains chirality-specific motion via shear-induced rotation and orbital translation.

Conclusions:

  • Macroscopic vortex flows can exert chirality-specific forces on objects.
  • The findings provide a mechanistic understanding of chiral discrimination in shear flows.
  • This research suggests potential for micro- and nanoscale chiral separation using rotating flows.