Quantum turbulence at finite temperature: The two-fluids cascade Export

@article{citeulike:5831298, abstract = {To model isotropic homogeneous quantum turbulence in superfluid helium, we have performed Direct Numerical Simulations (DNS) of two fluids (the normal fluid and the superfluid) coupled by mutual friction. We have found evidence of strong locking of superfluid and normal fluid along the turbulent cascade, from the large scale structures where only one fluid is forced down to the vorticity structures at small scales. We have determined the residual slip velocity between the two fluids, and, for each fluid, the relative balance of inertial, viscous and friction forces along the scales. Our calculations show that the classical relation between energy injection and dissipation scale is not valid in quantum turbulence, but we have been able to derive a temperature-dependent superfluid analogous relation. Finally, we discuss our DNS results in terms of the current understanding of quantum turbulence, including the value of the effective kinematic viscosity.}, author = {Roche, P. E. and Barenghi, C. F. and Leveque, E.}, citeulike-article-id = {5831298}, citeulike-linkout-0 = {http://dx.doi.org/10.1209/0295-5075/87/54006}, doi = {10.1209/0295-5075/87/54006}, journal = {EPL (Europhysics Letters)}, keywords = {dns, qt, quantum\_turbulence, superfluid}, number = {5}, pages = {54006+}, posted-at = {2009-09-23 15:41:33}, priority = {0}, title = {Quantum turbulence at finite temperature: The two-fluids cascade}, url = {http://dx.doi.org/10.1209/0295-5075/87/54006}, volume = {87}, year = {2009} }

TY - JOUR ID - citeulike:5831298 L3 - citeulike-article-id:5831298 N2 - To model isotropic homogeneous quantum turbulence in superfluid helium, we have performed Direct Numerical Simulations (DNS) of two fluids (the normal fluid and the superfluid) coupled by mutual friction. We have found evidence of strong locking of superfluid and normal fluid along the turbulent cascade, from the large scale structures where only one fluid is forced down to the vorticity structures at small scales. We have determined the residual slip velocity between the two fluids, and, for each fluid, the relative balance of inertial, viscous and friction forces along the scales. Our calculations show that the classical relation between energy injection and dissipation scale is not valid in quantum turbulence, but we have been able to derive a temperature-dependent superfluid analogous relation. Finally, we discuss our DNS results in terms of the current understanding of quantum turbulence, including the value of the effective kinematic viscosity. IS - 5 JF - EPL (Europhysics Letters) TI - Quantum turbulence at finite temperature: The two-fluids cascade VL - 87 SP - 54006 KW - dns KW - qt KW - quantum_turbulence KW - superfluid AU - Roche, PE AU - Barenghi, CF AU - Leveque, E PY - 2009/// UR - http://dx.doi.org/10.1209/0295-5075/87/54006 ER -