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Numerical investigation of influence of human walking on dispersion and deposition of expiratory droplets in airborne infection isolation room

机译：人体行走对空气传播隔离室中呼气飞沫散布和沉积影响的数值研究

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摘要

This paper introduces a numerical simulation model for investigating the influence of moving subjects on the dispersion and deposition of expiratory droplets, rather than on the dispersion of surrogate gaseous counterparts generally adopted in related research works. In our work, the Lagrangian discrete trajectory model is used for tracing the motion of droplets, the Eulerian RANS method is used for solving the airflow field, and the dynamic mesh model for describing the human movement. The model validation was performed through result comparisons with published data from literatures. A case study on the influence of human walking on the dispersion and deposition of expiratory droplets in an airborne infection isolation room (AI1R) is then presented. Our findings show that the human walking disturbs the local velocity field with wake formation. The increase of walking speed could effectively reduce the overall number of suspended droplets, which may have a positive impact on releasing the infection risk of health workers in AIIR.
机译：本文介绍了一种数值模拟模型，用于研究运动对象对呼气液滴的散布和沉积的影响，而不是对相关研究工作中通常采用的替代气体对应物的散布的影响。在我们的工作中，拉格朗日离散轨迹模型用于跟踪液滴的运动，欧拉RANS方法用于求解气流场，而动态网格模型用于描述人体运动。通过与文献中发表的数据进行结果比较，进行模型验证。然后提出了一个案例研究，该案例研究了人的行走对呼吸传播隔离室（AI1R）中呼气飞沫的分散和沉积的影响。我们的发现表明，人的行走会干扰尾流形成的局部速度场。步行速度的提高可以有效减少悬浮液滴的总数，这可能对释放AIIR中卫生工作者的感染风险有积极影响。

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  • 来源
    《Building and Environment》 |2011年第10期|p.1993-2002|共10页
  • 作者

    Jinliang Wang; Tin-Tai Chow;

  • 作者单位

    Building Energy and Environmental Technology Research Unit, Division of Building Science and Technology, City University of Hong Kong, Tat Chee Avenue, Kowloon,Hong Kong SAR, China;

    Building Energy and Environmental Technology Research Unit, Division of Building Science and Technology, City University of Hong Kong, Tat Chee Avenue, Kowloon,Hong Kong SAR, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    droplet; human movement; dynamic mesh; lagrangian model; isolation room;

    机译：水滴;人类运动动态网格拉格朗日模型隔离室;

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