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Lagrangian accelerations of particles in superfluid turbulence

Published online by Cambridge University Press:  07 February 2013

M. La Mantia ,
D. Duda ,
M. Rotter  and
L. Skrbek
M. La Mantia*
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague,Czech Republic
D. Duda
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague,Czech Republic
M. Rotter
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague,Czech Republic
L. Skrbek
Affiliation:
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague,Czech Republic
*
†Email address for correspondence: [email protected]
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Abstract

Quantum turbulence in thermal counterflow of superfluid ${\text{} }^{4} \mathrm{He} $ is studied at length scales comparable to the mean distance $\ell $ between quantized vortices. The Lagrangian dynamics of solid deuterium particles, of radius ${R}_{p} $ about one order of magnitude smaller than $\ell $, is analysed in a planar section of the experimental volume by using the particle tracking velocimetry technique. We show that the average amplitude of the acceleration of the particles seems to increase as the temperature decreases and applied heat flux increases and this can be explained by exploiting the two-fluid model of superfluid ${\text{} }^{4} \mathrm{He} $. We also report that, at the probed length scales, the normalized distribution of the acceleration of the particles appears to follow an unexpected classical-like behaviour.

JFM classification

Multiphase and Particle-laden Flows: Particle/fluid flow Complex Fluids: Quantum fluids Vortex Flows: Vortex dynamics
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 717 , 25 February 2013 , R9
Copyright
©2013 Cambridge University Press

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