EPJ Web of Conferences
Volume 45, 2013EFM12 – Experimental Fluid Mechanics 2012
|Number of page(s)||4|
|Published online||09 April 2013|
Lagrangian velocity distributions in thermal counterflow of superfluid 4He
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic
a e-mail: firstname.lastname@example.org
Quantum turbulence in thermal counterflow of superfluid 4He is visualized and studied at length scales comparable to the average distance between quantized vortices. The lagrangian velocities of micrometer- sized deuterium particles are obtained in a planar section of the flow field by using the particle tracking velocime- try technique. It is shown that the lagrangian velocity normalized distributions are strongly non-gaussian, with power-law tails, in contrast to the nearly gaussian distributions obtained in classical turbulent flows. The average distance between quantized vortices can therefore be seen as the length scale indicating the transition between classical-like and quantum behavior in thermal counterflow of superfluid 4He.
© Owned by the authors, published by EDP Sciences, 2013
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