Amplification of Molecular Fluctuations into Macroscopic Vortices by Convective Instabilities
Amplification of Molecular Fluctuations into Macroscopic Vortices by Convective Instabilities
复制标题
对流不稳定性将分子波动放大为宏观涡旋
DOI：
10.1209/0295-5075/22/8/001
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发表时间：
1993
期刊：
影响因子：
1.8
通讯作者：
A. Recktenwald
中科院分区：
文献类型：
--
作者：
M. Lücke;A. Recktenwald
本文研究了在热噪声存在下的对流不稳定区中，存在外部通流时脉动Taylor涡流（TVF）和Rayleigh-Benard对流（RBC）的统计动力学。通过对适当的微观场进行粗粒化处理，导出了进口热脉动与下游涡流之间的关系。研究了分子涨落引起的宏观涡旋的下游增长，并计算了相应的涨落谱。
The statistical dynamics of fluctuating Taylor vortex flow (TVF) and Rayleigh-Benard convection (RBC) in the presence of externally imposed throughflow is studied in the convectively unstable regime in the presence of thermal noise. A relation between thermal fluctuations at the inlet and downstream vortex flow is derived by coarse-graining appropriate microscopic fields. The downstream growth of macroscopic vortices out of molecular fluctuations is investigated and relevant fluctuation spectra are evaluated.