TY - JOUR
T1 - Fully Coupled Two-Fluid Dynamics in Superfluid He 4
T2 - Anomalous Anisotropic Velocity Fluctuations in Counterflow
AU - Yui, Satoshi
AU - Kobayashi, Hiromichi
AU - Tsubota, Makoto
AU - Guo, Wei
N1 - Funding Information:
The authors acknowledge W. F. Vinen for insightful discussions. S. Y. acknowledges the support from Grant-in-Aid for JSPS Fellow (Grant No. JP19J00967). H. K. acknowledges the support from the MEXT-Supported Program for the Strategic Research Foundation at Private Universities “Topological Science” (Grant No. S1511006) and JSPS KAKENHI (Grant No. JP18K03935). M. T. acknowledges the support from JSPS KAKENHI (Grant No. JP17K05548). W. G. acknowledges the support from the National Science Foundation (Grant No. DMR-1807291) and the National High Magnetic Field Laboratory which is supported through the NSF Cooperative Agreement No. DMR-1644779 and the state of Florida.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/4/17
Y1 - 2020/4/17
N2 - We investigate the thermal counterflow of the superfluid He4 by numerically simulating three-dimensional fully coupled dynamics of the two fluids, namely quantized vortices and a normal fluid. We analyze the velocity fluctuations of the laminar normal fluid arising from the mutual friction with the quantum turbulence of the superfluid component. The streamwise fluctuations exhibit higher intensity and longer-range autocorrelation, as compared to transverse ones. The anomalous fluctuations are consistent with visualization experiments [Mastracci et al., Phys. Rev. Fluids 4, 083305 (2019)PLFHBR2469-990X10.1103/PhysRevFluids.4.083305], and our results confirm their analysis with simple models on the anisotropic fluctuations. This success validates the model of the fully coupled dynamics and paves the way for solving some outstanding problems in this two-fluid system.
AB - We investigate the thermal counterflow of the superfluid He4 by numerically simulating three-dimensional fully coupled dynamics of the two fluids, namely quantized vortices and a normal fluid. We analyze the velocity fluctuations of the laminar normal fluid arising from the mutual friction with the quantum turbulence of the superfluid component. The streamwise fluctuations exhibit higher intensity and longer-range autocorrelation, as compared to transverse ones. The anomalous fluctuations are consistent with visualization experiments [Mastracci et al., Phys. Rev. Fluids 4, 083305 (2019)PLFHBR2469-990X10.1103/PhysRevFluids.4.083305], and our results confirm their analysis with simple models on the anisotropic fluctuations. This success validates the model of the fully coupled dynamics and paves the way for solving some outstanding problems in this two-fluid system.
UR - http://www.scopus.com/inward/record.url?scp=85084790577&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85084790577&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.124.155301
DO - 10.1103/PhysRevLett.124.155301
M3 - Article
C2 - 32357033
AN - SCOPUS:85084790577
SN - 0031-9007
VL - 124
JO - Physical review letters
JF - Physical review letters
IS - 15
M1 - 155301
ER -