论文标题
局部涡流的球形对称形成，围绕超级流体$^4 $ He的热源缠结
Spherically symmetric formation of localized vortex tangle around a heat source in superfluid $^4$He
论文作者
论文摘要
我们研究了围绕热源淹没到散装超级流体4HE的热源的球形对称热逆流下的涡流缠结发育的动力学过程。我们揭示了一种奇特的涡旋动力学，该动力学是该几何形状所独有的，它与均匀反流中的涡流动力学大不相同。这里考虑了两种类型的加热器，即带有实心墙壁和点状加热器的球形加热器。在这两种情况下，围绕加热器形成了球形涡流缠结。圆周附近涡流缠结发育的机制由Donnelly-Glaberson的不稳定强烈控制。而，远离加热器或点加热器周围，该机构受径向反流中极化涡流环的动力学控制。还研究了这种局部涡流缠结的衰减过程，并将其与均质涡流缠结的过程进行了比较。
We study the dynamical process of the vortex tangle development under a spherically symmetric thermal counterflow around a heat source submerged into a bulk superfluid 4He. We reveal a peculiar vortex dynamics that is unique to this geometry, which is greatly diverse from the vortex dynamics in a homogeneous counterflow. Two types of heater are considered here, namely, a spherical heater with a solid wall and a point-like heater. In both cases, a spherical vortex tangle is formed surrounding the heater. The mechanism of vortex tangle development in the vicinity of a solid wall is strongly governed by Donnelly-Glaberson instability; while, far away from the heater or around a point heater, the mechanism is governed by the dynamics of polarized vortex loops in radial counterflow. The decay process of such localized vortex tangles is also investigated and is compared with that of homogeneous vortex tangles.
