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Numerical investigation of motion of sulfuric and hydrochloric droplets with phase change in free-falling process

机译：自由下落过程中硫和氢氯滴运动的相变数值研究

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摘要

Hydrochloric droplets and sulfuric droplets are two common contaminants in indoor environments. The different mechanisms of phase change may cause different transport behaviours in them. This paper presents fundamental research conducted to numerically investigate the free fall of single hydrochloric droplets and sulfuric droplets. The influence of the initial diameter and relative humidity (RH) are considered. The diameter change and falling distance of these two types of droplets were compared and discussed. The results show that the phase change and motion of the two types of droplets are quite different. It was possible for the hydrochloric droplets to evaporate completely, while it was not for the sulfuric droplets. The sulfuric droplets have a minimum size and show a linear tendency of increase in size with the increase in initial diameter at a certain RH. The evaporation time of a hydrochloric droplet exhibits an exponential relationship with the initial diameter at a certain RH. A two-stage motion behaviour is observed on comparing the falling distances between the two types of droplets under identical initial conditions. The falling distances of the hydrochloric droplets at different initial sizes and RH were determined. Furthermore, it was found that the falling of single hydrochloric and sulfuric droplets could be severely mispredicted if the solution effect and/or HCl volatilisation is ignored. The results of this study could contribute to the accurate prediction and evaluation of the damage inflicted by hydrochloric and sulfuric droplets on human health, equipment, and building structures.
机译：盐酸滴和硫酸滴是室内环境中的两种常见污染物。相变的不同机制可能在其中引起不同的传输行为。本文提出了基础研究，以数值方式研究单个盐酸滴和硫酸滴的自由下落。考虑初始直径和相对湿度（RH）的影响。比较并讨论了这两种液滴的直径变化和下降距离。结果表明，两种液滴的相变和运动有很大的不同。盐酸液滴可能会完全蒸发，而硫酸液滴则不会。硫滴的尺寸最小，并且在一定的相对湿度下，随着初始直径的增加，尺寸呈线性增加趋势。在一定的相对湿度下，盐酸液滴的蒸发时间与初始直径呈指数关系。在相同初始条件下比较两种液滴之间的下降距离时，观察到了两阶段的运动行为。确定了不同初始尺寸和相对湿度下的盐酸滴的下落距离。此外，已经发现，如果忽略溶液效应和/或HCl挥发，可能会严重错误地预测单个盐酸滴和硫酸滴的下落。这项研究的结果可能有助于准确预测和评估盐酸和硫酸滴对人体健康，设备和建筑结构造成的损害。

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  • 来源
    《Building and Environment》 |2019年第6期|16-23|共8页
  • 作者

    Yang Yang; Song Bingbing; Wang Yi; Fan Jianing; Karkri Mustapha; Wei Yingrong;

  • 作者单位

    Xian Univ Architecture & Technol, State Key Lab Green Bldg Western China, Xian 710055, Shaanxi, Peoples R China|Xian Univ Architecture & Technol, Sch Bldg Serv Sci & Engn, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Bldg Serv Sci & Engn, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, State Key Lab Green Bldg Western China, Xian 710055, Shaanxi, Peoples R China|Xian Univ Architecture & Technol, Sch Bldg Serv Sci & Engn, Xian 710055, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Bldg Serv Sci & Engn, Xian 710055, Shaanxi, Peoples R China;

    Univ Paris Est, Lab CERTES, 61 Ave Gen Gaulle, F-94010 Creteil, France;

    Xian Univ Architecture & Technol, Sch Bldg Serv Sci & Engn, Xian 710055, Shaanxi, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrochloric droplet; Sulfuric droplet; Free falling; Volatilisation; Indoor air quality;

    机译：盐酸滴;硫滴;自由下落;挥发;室内空气质量;

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