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arXiv 1612.03035physics.flu-dyn
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T型混合器中水-乙醇流动的直接数值模拟

Direct numerical simulation of water-ethanol flows in a T-mixer

Tobias Schikarski, Wolfgang Peukert, Marc Avila

摘要:

流体的有效混合在许多应用中是关键,例如化学反应和纳米颗粒沉淀。然而,很难获得混合动力学的详细实验测量,因此预测性数值工具有助于设计和优化许多过程。如果考虑两种不同的流体,混合物的粘度和密度通常非线性地取决于组成,这使得混合过程的建模特别具有挑战性。因此,水-水混合物在简单的几何形状,如T型混合器已被深入研究,但很少有人知道更复杂的混合物的动力学,特别是在湍流状态。在这里,我们提出了一种数值方法,允许精确模拟两种流体的混合物。使用这种方法的高性能实现,我们进行直接的数值模拟解决的空间和时间动态的水-乙醇流的雷诺数从100到2000。详细讨论了湍流转捩过程中遇到的流动状态及其混合特性,并与水-水混合物进行了比较。

英文摘要:

The efficient mixing of fluids is key in many applications, such as chemical reactions and nanoparticle precipitation. Detailed experimental measurements of the mixing dynamics are however difficult to obtain, and so predictive numerical tools are helpful in designing and optimizing many processes. If two different fluids are considered, the viscosity and density of the mixture depend often nonlinearly on the composition, which makes the modeling of the mixing process particularly challenging. Hence water-water mixtures in simple geometries such as T-mixers have been intensively investigated, but little is known about the dynamics of more complex mixtures, especially in the turbulent regime. We here present a numerical method allowing the accurate simulation of two-fluid mixtures. Using a high-performance implementation of this method we perform direct numerical simulations resolving the spatial and temporal dynamics of water-ethanol flows for Reynolds numbers from 100 to 2000. The flows states encountered during turbulence transition and their mixing properties are discussed in detail and compared to water-water mixtures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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