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Statistical analysis of jet drop generation based on bubble size measurements in the pickling process

机译：基于气泡尺寸测量在酸洗过程中的喷射液滴统计分析

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摘要

Droplets are a typical air pollutant in the industrial indoor environment. Investigating droplet generation provides a theoretical basis for droplet control. This study focuses on the drops generated by collapsing bubbles during the pickling process. As the initial size and speed of the subsequent drops are highly relevant to the size of the bubbles, firstly, the bubble sizes were quantitatively measured using a high-speed camera. The effect of three operation parameters (Fe2+ concentration, CFe2+, solution temperature, T-s, hydrochloric acid concentration in solution, C-HCl) on the bubble sizes was determined. It was found that when CFe2+ decreased, T-s or C-HCl increased, some bubbles became larger because the increasing reaction rates lead to a higher coalescence rate for the bubbles. The larger bubbles mainly concentrated on the solution surface above both ends of the circular work piece. Bubble collapse would mainly generate jet drops as the bubble size was mainly less than 1800 mu m. Thus, the initial motion direction of a drop was vertically upward. Secondly, the initial size and speed of the top three drops from a bubble were obtained based on an empirical equation. The results showed that the droplet size could be over 209 mu m, and the initial speed could be over 11.55 ms(-1) . More than 96% of the jet drops had a diameter below 20 mu m in the pickling process, while 0.11% of the jet drops had a diameter exceeding 100 mu m. The mass percentage of the drops with a diameter larger than 100 mu m was over 75%.
机译：液滴是工业室内环境中的典型空气污染物。调查液滴产生为液滴控制提供了理论依据。本研究重点介绍在酸洗过程中通过塌陷气泡而产生的液滴。随着后续液滴的初始尺寸和速度与气泡的尺寸高度相关，首先，使用高速相机定量测量气泡尺寸。确定三种操作参数（Fe2 +浓度，CFE2 +，溶液温度，T-S，盐酸浓度在溶液，C-HCl）上的效果。结果发现，当CFE2 +降低时，T-S或C-HCl增加，一些气泡变大，因为增加的反应速率导致气泡的更高的聚结率。较大的气泡主要集中在圆形工件的两端上方的溶液表面上。泡泡坍塌主要产生喷射滴，因为气泡尺寸主要小于1800亩。因此，下降的初始运动方向垂直向上。其次，基于经验方程获得来自气泡的前三滴的初始尺寸和速度。结果表明，液滴尺寸可超过209μm，初始速度可超过11.55ms（-1）。在酸洗过程中，超过96％的喷射液滴的直径低于20μm，而0.11％的喷射液滴的直径超过100μm。直径大于100μm的滴的质量百分比超过75％。

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  • 来源
    《Building and Environment》 |2019年第5期|25-33|共9页
  • 作者

    Wang Yi; Fan Jia-Ning; Yang Yang; Zhang Yuming; Cao Zhixiang; Wang Tianlong;

  • 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;

    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;

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

    Jet drop; Coalescence; Bubble collapse; Pickling process; Indoor air quality;

    机译：喷射滴;聚结;泡泡坍塌;酸洗过程;室内空气质量;

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