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Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Drag01:23

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Drag is a resistive force opposing an object’s motion through a fluid, resulting from surface pressure and shear forces. It comprises two components: a perpendicular one from pressure and a tangential one from shear stress. Accurate drag calculations use pressure and wall shear stress distributions, often determined through Computational Fluid Dynamics (CFD) or wind tunnel testing. The drag coefficient, a dimensionless measure, depends on factors like shape, Reynolds number, Mach number,...
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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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Potential Due to a Magnetized Object01:24

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
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In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
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Magnetic Force On A Current-Carrying Conductor01:25

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
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Fluid Drag Reduction by Magnetic Confinement.

Arvind Arun Dev1,2, Peter Dunne1, Thomas M Hermans2

  • 1Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS, UMR 7504 CNRS-UdS, 67034 Strasbourg, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 4, 2022
PubMed
Summary
This summary is machine-generated.

Researchers achieved significant drag reduction (60-99%) in microfluidic channels using cylindrical liquid-in-liquid flow. This novel method overcomes limitations of viscous liquid flow, offering a new path for efficient microfluidic device design.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Materials science

Background:

  • Frictional forces in viscous liquid flow cause significant energy loss, limiting microfluidic applications.
  • Existing drag reduction methods offer limited improvements, typically below a few tens of percent.

Purpose of the Study:

  • To investigate cylindrical liquid-in-liquid flow for substantial drag reduction in microfluidic channels.
  • To explore a novel approach independent of continuous confining fluid flow.

Main Methods:

  • Experimental investigation of cylindrical liquid-in-liquid flow in sub-mm and mm channels.
  • Development of a laminar flow model with modified Reynolds number incorporating geometrical factors and viscosity ratio.

Main Results:

  • Achieved drag reduction ranging from 60% to 99% across various viscosity ratios.
  • Demonstrated effectiveness regardless of whether the inner liquid's viscosity is higher or lower than the outer liquid.
  • Identified key design parameters for optimizing drag reduction through the modified Reynolds number.

Conclusions:

  • Cylindrical liquid-in-liquid flow offers a highly effective method for drag reduction in microfluidics.
  • This technique, utilizing a magnetically confined ferrofluid, bypasses the need for continuous lubricant flow.
  • The findings pave the way for microfluidic devices with significantly reduced pressure gradients and improved energy efficiency.