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Large Eddy Simulation of Titanium Dioxide Nanoparticle Formation and Growth in Turbulent Jets

机译:湍流射流中二氧化钛纳米粒子形成和生长的大涡模拟

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摘要

Large eddy simulations (LES) of titanium dioxide nanoparticles in three dimensional turbulent reacting planar jets are performed. The spatio-temporal evolution of the particle field is obtained by utilizing a nodal representation of the general dynamic equation. Gradient-diffusion, Smagorinsky-type subgrid-scale closures are employed to account for the unresolved stresses, fluid-scalar fluxes, and fluid-particle fluxes. The effect of the unresolved fluctuations on coagulation are neglected. Simulations are performed at two different precursor concentration levels. Comparison between results obtained via direct numerical simulation (DNS) and LES is performed to assess the performance of the closures. The LES performs fairly well in predicting the particle concentration as a function of size as well as the mean diameter. Additionally the polydispersity of the LES particle field is greater than that of the DNS. The results also suggest that at as the precursor concentration increases, neglect of the unresolved particle-particle interactions may act to increase the nanoparticle growth-rate.
机译:在三维湍流反应平面射流中对二氧化钛纳米粒子进行了大涡模拟(LES)。粒子场的时空演化是通过利用一般动力学方程的节点表示而获得的。梯度扩散,Smagorinsky型亚网格规模的封闭被用于解决未解决的应力,流体标量通量和流体颗粒通量。未解决的波动对凝血的影响被忽略。在两种不同的前体浓度水平下进行模拟。通过直接数值模拟(DNS)和LES获得的结果之间进行比较,以评估密封件的性能。 LES在预测颗粒浓度与尺寸以及平均直径之间的关系方面表现相当出色。此外,LES粒子场的多分散性大于DNS的多分散性。结果还表明,随着前驱物浓度的增加,对未解决的颗粒间相互作用的忽视可能会增加纳米颗粒的生长速率。

著录项

  • 来源
    《Aerosol Science and Technology》 |2011年第5期|p.616-628|共13页
  • 作者单位

    Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:57:40

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