Noisy transitional flows in imperfect channels
Noisy transitional flows in imperfect channels
复制标题
不完善通道中的嘈杂过渡流
DOI：
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发表时间：
2015
影响因子：
3.7
通讯作者：
V. Yakhot
中科院分区：
文献类型：
--
作者：
C. Lissandrello;Le Li;K. Ekinci;V. Yakhot
在这里，我们研究非理想毫米尺度通道中的噪声过渡流。为了探测水流，我们使用嵌入通道壁的微悬臂传感器。我们在两个名义上相同的通道中进行实验。这两个通道中不同的缺陷集合导致了两个随机流动，其中近壁波动的高阶矩相差数量级。然而，令人惊讶的是，这两种情况下的最低阶统计量似乎在性质上是相似的，并且可以用所提出的慢模噪声朗道方程来描述。无论其来源如何，噪声使弛豫时间的朗道奇点正则化，并使由不同噪声源驱动的跃迁看起来相似。
Here, we study noisy transitional flows in imperfect millimetre-scale channels. For probing the flows, we use microcantilever sensors embedded in the channel walls. We perform experiments in two nominally identical channels. The different sets of imperfections in the two channels result in two random flows in which the high-order moments of the near-wall fluctuations differ by orders of magnitude. Surprisingly, however, the lowest-order statistics in both cases appear to be qualitatively similar and can be described by a proposed noisy Landau equation for a slow mode. The noise, regardless of its origin, regularizes the Landau singularity of the relaxation time and makes transitions driven by different noise sources appear similar.