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Related Concept Videos

Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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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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Steady, Laminar Flow Between Parallel Plates01:17

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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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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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
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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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Dancing Electrohydrodynamic Tip Streaming Modulated by Faraday Instability.

Qiyou Liu1, Bingqiang Ji1,2, Yafeng Zou1

  • 1School of Astronautics, Beihang University, Beijing, 100191, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 14, 2025
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Summary

Researchers discovered dancing electrohydrodynamic (EHD) tip streaming, a method for precise microscale droplet generation. This technique offers enhanced throughput and control for applications like 3D printing and drug delivery.

Keywords:
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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Electrohydrodynamics

Background:

  • Tip streaming generates micro/nanoscale droplets for 3D printing, nanomaterials, and drug delivery.
  • High-frequency jetting is crucial for efficiency but challenging to control.
  • Electrohydrodynamic (EHD) tip streaming involves fluid behavior under electric fields.

Purpose of the Study:

  • To report and elucidate the mechanism of dancing EHD tip streaming with subharmonic ejection modes.
  • To demonstrate precise control over high-frequency EHD tip streaming.
  • To explore the potential of this phenomenon for drop-on-demand technologies.

Main Methods:

  • Inducing high-frequency electric fields to observe tip streaming phenomena.
  • Analyzing meniscus oscillations and Faraday instability.
  • Investigating interfacial instability at Faraday wave crests.

Main Results:

  • Observed dancing EHD tip streaming with subharmonic ejection modes.
  • Elucidated the mechanism involving global meniscus oscillations and local interfacial instability.
  • Identified optimal frequencies governed by Faraday instability and ejection voltage thresholds determined by electric Bond number.

Conclusions:

  • Dancing EHD tip streaming provides a controllable method for high-frequency micro/nanoscale droplet generation.
  • The phenomenon enhances throughput and enables multi-path delivery.
  • This offers new prospects for precision 3D printing, nanomaterial fabrication, and drug delivery systems.