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Backreaction of tracer particles on vortex tangle in helium II counterflow

Lookup NU author(s): Professor Carlo Barenghi, Emeritus Professor Yuri Sergeev

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Abstract

We report computer simulations of the interaction of seeding particles with quantized vortices and with the normal fluid flow in thermal counterflow of superfluid ⁴He. We show that if the number of particles is too large, the vortex tangle is significantly affected, posing problems in the interpretation of visualization experiments. The main effects are an increase in vortex line density and a change in polarization of the vortex tangle, caused by the action of the Stokes drag of the viscous normal fluid on the trapped particles. We argue that in the case of large particle number, typically used for the particle image velocimetry technique, the tangle properties might become significantly changed. On the contrary, the particle tracking velocimetry technique that uses smaller particle concentration should not be appreciably affected.

Publication metadata

Author(s): Varga E, Barenghi CF, Sergeev YA, Skrbek L

Publication type: Article

Publication status: Published

Journal: Journal of Low Temperature Physics

Year: 2016

Volume: 183

Issue: 3

Pages: 215-221

Print publication date: 01/05/2016

Online publication date: 29/12/2015

Acceptance date: 14/12/2015

Date deposited: 17/01/2016

ISSN (print): 0022-2291

ISSN (electronic): 1573-7357

Publisher: Springer

URL: http://dx.doi.org/10.1007/s10909-015-1430-7

DOI: 10.1007/s10909-015-1430-7

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