Turbulent drag on a low-frequency vibrating grid in superfluid 4 He at very low temperatures
Turbulent drag on a low-frequency vibrating grid in superfluid 4 He at very low temperatures
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极低温度下超流体 4 He 中低频振动网格上的湍流阻力
DOI：
10.1103/physrevb.85.224533
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发表时间：
2012
影响因子：
3.7
通讯作者：
Bradley D
中科院分区：
文献类型：
--
作者：
Bradley D
我们目前的测量耗散湍流阻力的振动网格超流He在很宽的范围内（低）的频率。在高速下，耗散阻力与频率无关，并且与在正常液体He中测量的耗散阻力大致相同。我们在低温超流He-B中的类似网格上进行了测量，结果显示在低频下几乎相同的湍流阻力系数。然而，在He-B中的湍流阻力在更高的频率下显著更高。我们还提出了在He网格湍流惯性阻力系数的测量。在超流和正常液体He中，湍流都能显著地降低惯性阻力系数。
We present measurements of the dissipative turbulent drag on a vibrating grid in superfluidHe over a wide range of (low) frequencies. At high velocities, the dissipative drag is independent of frequency and is approximately the same as that measured in normal liquidHe. We present measurements on a similar grid in superfluidHe-B at low temperatures which shows an almost identical turbulent drag coefficient at low frequencies. However, the turbulent drag inHe-B is substantially higher at higher frequencies. We also present measurements of the inertial drag coefficient for grid turbulence inHe. The inertial drag coefficient is significantly reduced by turbulence in both superfluid and normal liquidHe.