Saturation of decaying counterflow turbulence in helium II

Article

关键词: SUPERFLUID TURBULENCE;    LIQUID-HELIUM;    HEAT CURRENT;    MUTUAL FRICTION;    QUANTIZED VORTICES;    GRID TURBULENCE;    FINITE CHANNEL;    HE-4;    TRANSITION;    PRESSURE;   

DOI  :  10.1103/PhysRevB.82.134531

来源: SCIE

【 摘 要 】

We are concerned with the problem of the decay of a tangle of quantized vortices in He II generated by a heat current. Direct application of Vinen's equation yields the temporal scaling of vortex line density L similar to t(-1). Schwarz and Rozen [Phys. Rev. Lett. 66, 1898 (1991); Phys. Rev. B 44, 7563 (1991)] observed a faster decay followed by a slower decay. More recently, Skrbek et al. [Phys. Rev. E 67, 047302 (2003)] found an initial transient followed by the same classical t(-3/2) scaling as observed in the decay of grid-generated turbulence. We present a simple theoretical model which, we argue, contains the essential physical ingredients, and accounts for these apparently contradictory results.

【 授权许可】

Free