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2015 ; 5
(ä): 10781
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Transition to turbulence in Taylor-Couette ferrofluidic flow
#MMPMID26065572
Altmeyer S
; Do Y
; Lai YC
Sci Rep
2015[Jun]; 5
(ä): 10781
PMID26065572
show ga
It is known that in classical fluids turbulence typically occurs at high Reynolds
numbers. But can turbulence occur at low Reynolds numbers? Here we investigate
the transition to turbulence in the classic Taylor-Couette system in which the
rotating fluids are manufactured ferrofluids with magnetized nanoparticles
embedded in liquid carriers. We find that, in the presence of a magnetic field
transverse to the symmetry axis of the system, turbulence can occur at Reynolds
numbers that are at least one order of magnitude smaller than those in
conventional fluids. This is established by extensive computational
ferrohydrodynamics through a detailed investigation of transitions in the flow
structure, and characterization of behaviors of physical quantities such as the
energy, the wave number, and the angular momentum through the bifurcations. A
finding is that, as the magnetic field is increased, onset of turbulence can be
determined accurately and reliably. Our results imply that experimental
investigation of turbulence may be feasible by using ferrofluids. Our study of
transition to and evolution of turbulence in the Taylor-Couette ferrofluidic flow
system provides insights into the challenging problem of turbulence control.
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