THE SIMULATION OF CHAOTIC MIXING AND DISPERSION FOR PERIODIC FLOWS IN BAFFLED CHANNELS
THE SIMULATION OF CHAOTIC MIXING AND DISPERSION FOR PERIODIC FLOWS IN BAFFLED CHANNELS
复制标题
折流通道内周期性流动的混沌混合与分散模拟
DOI：
10.1016/0009-2509(91)87014-4
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发表时间：
1991
影响因子：
4.7
通讯作者：
E. Roberts
中科院分区：
文献类型：
--
作者：
T. Howes;M. Mackley;E. Roberts
我们报告了二维通道内不可压缩牛顿流体流动的数字生成的流动可视化模拟，该二维通道可以包含周期性挡板。对于这种几何形状中的不稳定流动，当存在挡板时，会观察到混沌平流状态。不稳定性有两种形式之一：由流动的对称性破坏不稳定性引起的“自然”不稳定性，或通过将振荡分量应用于流动而产生的“强制”不稳定性。这种混沌平流被证明可以提供有效的混合机制，并在过程工业中有许多应用。正如最近在文献中实验报道的那样，观察到增强的横向混合，这导致传输性能增加，结垢率降低，并且在某些情况下，轴向扩散减少。
We report numerically generated flow visualisation simulations for the flow of an incompressible Newtonian fluid within a two-dimensional channel which can contain periodic baffles. Forunsteadyflows in this geometry a regime of chaotic advection is observed when baffles are present. The unsteadiness takes one of two forms: a “natural” unsteadiness caused by a symmetry breaking instability of the flow, or a “forced” unsteadiness generated by applying an oscillatory component to the flow. This chaotic advection is shown to provide an efficient mixing mechanism and has a number of applications in the process industry. Enhanced transverse mixing is observed which results in increased transfer properties, reduced fouling rates and, in some circumstances, a reduction in axial dispersion, as recently experimentally reported in the literature.