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  Spontaneous core rotation in ferrofluid pipe flow

Krekhov, A., & Shliomis, M. (2017). Spontaneous core rotation in ferrofluid pipe flow. Physical Review Letters, 118(11): 114503. doi:10.1103/PhysRevLett.118.114503.

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 Creators:
Krekhov, Alexei1, Author              
Shliomis, M., Author
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1Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063287              

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 Abstract: Ferrofluid flow along a tube of radius R in a constant axial magnetic field is revisited. Our analytical solution and numerical simulations predict a transition from an initially axial flow to a steady swirling one. The swirl dynamo arises above some critical pressure drop and magnetic field strength. The new flow pattern consists of two phases of different symmetry: The flow in the core resembles Poiseuille flow in a rotating tube of the radius r(*) < R, where each fluid element moves along a screw path, and the annular layer of the thickness R - r(*), where the flow remains purely axial. These phases are separated by a thin domain wall. The swirl appearance is accompanied with a sharp increase in the flow rate that might serve for the detection of the swirling instability.

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Language(s): eng - English
 Dates: 2017-03-172017-03
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.118.114503
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Title: Physical Review Letters
Source Genre: Journal
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Pages: 5 Volume / Issue: 118 (11) Sequence Number: 114503 Start / End Page: - Identifier: -