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Spontaneous Core Rotation in Ferrofluid Pipe Flow.

Alexei Krekhov1, Mark Shliomis2

  • 1Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany.

Physical Review Letters
|April 4, 2017
PubMed
Summary
This summary is machine-generated.

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Ferrofluid flow in a magnetic field transitions to a swirling pattern above critical conditions. This instability, driven by a swirl dynamo, features distinct core and annular flow phases and a notable flow rate increase.

Area of Science:

  • Fluid dynamics
  • Magnetohydrodynamics
  • Non-Newtonian fluid behavior

Background:

  • Ferrofluid behavior in axial magnetic fields is complex.
  • Understanding flow transitions is crucial for applications.

Purpose of the Study:

  • To analyze ferrofluid flow in a tube under an axial magnetic field.
  • To investigate the transition to a swirling flow regime.

Main Methods:

  • Analytical solutions were derived.
  • Numerical simulations were performed.

Main Results:

  • A transition from axial to swirling flow was predicted.
  • A critical pressure drop and magnetic field strength induce swirl.
  • The flow pattern exhibits two distinct phases: a rotating core and an axial annular layer, separated by a domain wall.

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Conclusions:

  • The study reveals a novel swirling instability in ferrofluids.
  • The observed flow pattern and associated flow rate increase can aid in detecting this instability.