Anomalous diffusion and transport by a reciprocal convective flow
Anomalous diffusion and transport by a reciprocal convective flow
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相互对流的异常扩散和传输
DOI：
10.1103/physreve.106.024102
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发表时间：
2022
影响因子：
2.4
通讯作者：
Kitahata Hiroyuki
中科院分区：
文献类型：
--
作者：
Koyano Yuki;Kitahata Hiroyuki
在低雷诺数条件下，对流和扩散的动力学通常被单独考虑，因为它们的主要空间和时间尺度不同，但对流和扩散的协同效应可能导致扩散增强[Koyano，Phys. Rev. E 102，033109（2020）2470-004510.1103/PhysRevE.102.033109]。本文详细研究了这种协同效应。基于对流扩散方程的数值模拟表明，各向异性扩散和净位移以及扩散增强下发生的往复流。这种反常的扩散和输运是通过朗之万动力学的分析从理论上推导出来的。
Under low-Reynolds-number conditions, dynamics of convection and diffusion are usually considered separately because their dominant spatial and temporal scales are different, but cooperative effects of convection and diffusion can cause diffusion enhancement [Koyano , Phys. Rev. E 102, 033109 (2020)2470-004510.1103/PhysRevE.102.033109]. In this paper, such cooperative effects are investigated in detail. Numerical simulations based on the convection-diffusion equation revealed that anisotropic diffusion and net shift as well as diffusion enhancement occur under a reciprocal flow. Such anomalous diffusion and transport are theoretically derived by the analyses of the Langevin dynamics.