Particle trajectories in thermal counterflow of superfluid helium etc15 Tracking Number 72Presentation: Session: Superfluids 1 Room: Room E Session start: 10:30 Wed 26 Aug 2015 Marco La Mantia lamantia@nbox.troja.mff.cuni.cz Affifliation: Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic Ladislav Skrbek skrbek@fzu.cz Affifliation: Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic Topics: - Turbulence in multiphase and non-Newtonian flows, - Vortex dynamics and structure formation, - Lagrangian aspects of turbulence, - Turbulence in superfluids Abstract: The motion of micrometer-sized particles in a quantum flow -- thermal counterflow of superfluid helium -- is studied experimentally by using the particle tracking velocimetry technique, at various values of temperature and applied heat flux. The trajectory appearance changes as the imposed thermal counterflow velocity increases, i.e., the particle tracks appear, at low velocities, straighter than at larger ones, suggesting thus the transition to turbulence of the investigated flow. |