...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physics of fluids >Transport and deposition of dilute microparticles in turbulent thermal convection
【24h】

Transport and deposition of dilute microparticles in turbulent thermal convection

机译：

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We analyze the transport and deposition behavior of dilute microparticles in turbulent Rayleigh-Bénard convection. Two-dimensional direct numerical simulations were carried out for the Rayleigh number (Ra) of 10~8 and the Prandtl number (Pr) of 0.71 (corresponding to the working fluids of air). The Lagrangian point particle model was used to describe the motion of microparticles in the turbulence. Our results show that the suspended particles are homogeneously distributed in the turbulence for the Stokes number (St) less than 10~(-3), and they tend to cluster into bands for 10~(-3) ? St ? 10~(-2). At even larger St, the microparticles will quickly sediment in the convection. We also calculate the mean-square displacement (MSD) of the particle's trajectories. At short time intervals, the MSD exhibits a ballistic regime, and it is isotropic in vertical and lateral directions; at longer time intervals, the MSD reflects a confined motion for the particles, and it is anisotropic in different directions. We further obtained a phase diagram of the particle deposition positions on the wall, and we identified three deposition states depending on the particle's density and diameter. An interesting finding is that the dispersed particles preferred to deposit on the vertical wall where the hot plumes arise, which is verified by tilting the cell and altering the rotation direction of the large-scale circulation.

著录项

  • 来源
    《Physics of fluids》 |2020年第1期|83301-1-83301-9|共9页
  • 作者

    Ao Xu; Shi Tao; Le ShiHeng-Dong Xi;

  • 作者单位

    School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;

    Key Laboratory of Distributed Energy Systems of Guangdong Province, Dongguan University of Technology, Dongguan 523808, China;

    State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 流体力学;
  • 关键词

    Transport; deposition of dilute; microparticles in turbulent;

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号