Transition to Quantum Turbulence and Streamwise Inhomogeneity of Vortex Tangle in Thermal Counterflow
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We report preliminary results of the complementary experimental and numerical studies on spatiotemporal tangle development and streamwise vortex line density (VLD) distribution in counterflowing \(^4\)He. The experiment is set up in a long square channel with VLD and local temperature measured in three streamwise locations. In the steady state, we observe nearly streamwise-homogeneous VLD. Experimental second-sound data as well as numerical data (vortex filament method in a long planar channel starting with seeding vortices localized in multiple locations) show that the initial build-up pattern of VLD displays complex features depending on the position in the channel, but some tangle properties appear uniform along its length.
KeywordsSuperfluid \(^4\)He Quantum turbulence Thermal counterflow
This work is supported by the Czech Science Foundation under project GAČR 203/14/02005S and by the European Community Framework Programme 7, EuHIT—European High-performance Infrastructures in Turbulence, Grant Agreement No. 312778.