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首页> 外文期刊>AIAA Journal >Motion of Submicron Particles in Supersonic Laminar Boundary Layers
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Motion of Submicron Particles in Supersonic Laminar Boundary Layers

机译：超音速层流边界层中亚微米粒子的运动

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摘要

Submicron-particle motion in laminar boundary layers is present in many practical applications. Some important findings on this issue have been achieved during the last decades, but many mechanisms in this process still remain unclear. In the present work, a model has been developed to describe the motion of the submicron particles in supersonic laminar boundary layers above an adiabatic plate along with the mainstream. In this model, the Lagrangian method is used to track the particles and calculate their trajectories, and the Eulerian method to calculate the flowfield. The effects of the entering position, Mach number, and the size and density of the particles were investigated. It is concluded that there are three particle-motion patterns when they enter the supersonic boundary layer, which are departure pattern, equilibrium pattern, and deposition pattern. The drag force and Saffman lift force were discovered to play dominating roles in deciding the patterns, and thermophoretic force and Brownian force are of less importance. A dimensionless number to describe these three patterns is suggested. This work was intended to provide an insight into the submicron-particle motion in the supersonic laminar boundary layer, which can be guidance for industrial applications involving this phenomenon.
机译：在许多实际应用中存在层边界层中的亚微米粒子运动。在过去的几十年中，已经取得了有关此问题的一些重要发现，但是在此过程中的许多机制仍然不清楚。在目前的工作中，已经开发出一种模型来描述绝热板上方的超音速层流边界层中的亚微米颗粒以及主流的运动。在该模型中，拉格朗日方法用于跟踪粒子并计算其轨迹，而欧拉方法用于计算流场。研究了进入位置，马赫数以及颗粒尺寸和密度的影响。得出结论，当粒子进入超音速边界层时存在三种运动模式，分别是偏离模式，平衡模式和沉积模式。发现拖曳力和Saffman升力在决定模式中起主要作用，而热泳力和布朗力的重要性较小。建议使用无量纲数来描述这三种模式。这项工作旨在提供对超音速层流边界层中亚微米粒子运动的深入了解，这可为涉及此现象的工业应用提供指导。

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  • 来源
    《AIAA Journal》 |2015年第4期|1037-1047|共11页
  • 作者

    Li Xing; Bai Bofeng;

  • 作者单位

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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