Preliminary Measurements on Grid Turbulence in Liquid 4He
Preliminary Measurements on Grid Turbulence in Liquid 4He
复制标题
液体4He中网格湍流的初步测量
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
K. Thompson
中科院分区：
文献类型：
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作者：
G. Ihas;G. Labbé;S. C. Liu;K. Thompson
摘要
一个网格被拉过一个液氦柱，速度高达1米/秒，温度低至90 mK。响应时间小于1 ms的300微米Ge温度计测量了由所产生的湍流的衰减引起的温度上升。据信，均匀的，各向同性的量子湍流形成，因为网格雷诺数超过100，000创建。的率和功率谱的能量增加后，在氦气中检测到的栅极拉。结果进行了比较，其他量子和经典的结果，并在无粘性流体的开尔文波级联的理论。
Abstract
A grid has been pulled through a column of liquid helium at speeds as high as 1 m/s and at temperatures as low as 90 mK. A 300 micrometer Ge thermometer with response time of less than 1 ms measured the temperature rise resulting from the decay of the turbulence generated. It is believed that homogeneous, isotropic quantum turbulence was formed, since mesh Reynolds numbers in excess of 100,000 were created. The rates and power spectra of the energy increases detected in the helium after grid-pulls are determined. The results are compared to other quantum and classical results, and to the theory of the Kelvin wave cascade in a viscosity-free fluid.