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Related Concept Videos

Induced Electric Fields01:23

Induced Electric Fields

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Updated: Oct 6, 2025

Ice Generation and the Heat and Mass Transfer Phenomena of Introducing Water to a Cold Bath of Brine
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Ice nucleation forced by transient electric fields.

Jens-Michael Löwe1, Volker Hinrichsen1, Markus Schremb2

  • 1High-Voltage Laboratories, Technical University of Darmstadt, Darmstadt, 64283, Germany.

Physical Review. E
|January 15, 2022
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Summary
This summary is machine-generated.

Transient electric fields can actively induce ice nucleation in supercooled water droplets. High electric field strengths significantly promote ice nucleation, offering insights for high-voltage systems and food processing.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Icing impacts critical systems like aircraft and high-voltage power lines.
  • Ice nucleation in supercooled water droplets is a key initial step in ice accretion.
  • The influence of transient electric fields on ice nucleation is not well understood but is relevant to industry.

Purpose of the Study:

  • To experimentally investigate the impact of transient electric fields on ice nucleation in supercooled sessile water droplets.
  • To analyze the effect of different electric field strengths and supercooling levels on nucleation behavior.
  • To understand the underlying mechanisms by which electric fields influence ice nucleation.

Main Methods:

  • Supercooled sessile water droplets were exposed to transient electric fields generated by standard lightning and switching impulse voltages.
  • High-speed cameras were used to capture the nucleation behavior of individual droplets.
  • Analysis considered both singular and stochastic aspects of nucleation, examining droplet freezing over time.

Main Results:

  • Low electric field strengths (≤6.52kV/cm) had a negligible impact on ice nucleation.
  • High electric field strengths (≥9.78kV/cm) significantly promoted ice nucleation.
  • Electric fields appear to indirectly enhance nucleation by inducing droplet oscillations, with freezing delays varying significantly based on supercooling.

Conclusions:

  • Transient electric fields can be used to actively force ice nucleation in supercooled water.
  • These findings improve understanding of ice accretion on high-voltage insulators and have implications for the food industry.
  • The results provide a basis for formulating and validating new nucleation models.