HIGH-REYNOLDS-NUMBER THERMAL TURBULENCE IN MERCURY
HIGH-REYNOLDS-NUMBER THERMAL TURBULENCE IN MERCURY
复制标题
汞中的高雷诺数热湍流
DOI：
10.1103/physreve.56.r1302
复制
发表时间：
1997
影响因子：
2.4
通讯作者：
M. Sano
中科院分区：
文献类型：
--
作者：
A. Naert;T. Segawa;M. Sano
本文用低Pr数流体Hg（Pr= 0.024）研究了Rayleigh-Bénard对流单体中湍流的标度特性。根据可动电阻器的时间序列，分析了热层和粘性层的长度尺度，发现在所观测到的Rayleigh数范围内（10 6< Ra< 10 8），粘性边界层比热层薄。这一特点，特有的低Pr流体对流，不同于通常观察到的他，水，或其他流体。在较宽的Ra范围内，使用不同的纵横比单元（r = 0.5，1和2）研究了雷诺数Re和努塞尔数Nu的标度。在10 5< Ra< 2× 10 9范围内，即使两个边界层倒置，也没有观察到假设的极限状态（Nu = Ra 1/2）。
We have studied the scaling properties of turbulence in a Rayleigh-Bénard convection cell, using a low-Prandtl-number (Pr) fluid, Hg (Pr= 0.024). The length scales of thermal and viscous layers, analyzed from time series of movable thermistors near the cold upper plate, revealed that the viscous boundary layer is thinner than the thermal one over the observed range of Rayleigh numbers (10 6< Ra< 10 8). This feature, peculiar to low Pr fluid convection, differed from what is commonly observed in He, water, or other fluids. The scaling of Reynolds number Re and Nusselt number Nu has been investigated using different aspect ratio cells (Γ= 0.5, 1, and 2) for a wider range of Ra. The hypothetical ultimate regime (Nu∼ Ra 1/2) was not observed in the range 10 5< Ra< 2× 10 9 even though the two boundary layers are inverted.