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

Yang, Yang; Song, Bingbing; Wang, Yi; Fan, Jinping; Karkri, Mustapha; Wei, Yingrong

doi:10.1016/j.buildenv.2019.04.021

Cited by 13 publications

(3 citation statements)

References 36 publications

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“…As for droplets generated inside industrial buildings, Yang 26 numerically investigated the phase change and motion of sulphuric and hydrochloric acid droplets and compared the evaporation and settling characteristics of these two types of droplets. 27 Related studies have also investigated the motion and distribution of droplets emitted from a tank surface in a room. The control effect of different ventilation patterns, such as top suction hoods, push-pull ventilation system, 28 natural air inlet plus mechanical exhaust systems and mechanical air supply combined with natural air inlet plus mechanical exhaust systems, 29 has also been examined.…”

Section: Introductionmentioning

confidence: 99%

Inhalation and deposition of gas–droplet contaminant in the human microenvironment in an industrial building

Yang

Zhu

Wang

et al. 2023

Indoor and Built Environment

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Gas–droplet contaminants such as HCl gas and hydrochloric droplets are typical pollutants in industrial indoor environments. They are harmful to workers. As the transportation modes of the gas and droplet phases are different, they cause different exposure characteristics for human beings. This study numerically investigated the transport of HCl gas and hydrochloric droplets emitted from a pickling tank to a human microenvironment. Meanwhile, inhalation and deposition of hydrochloric acid gas and hydrochloric acid droplets by humans were also studied, which were influenced by the droplet initial diameter (10–100 μm), air draught (0.1–0.5 m/s) and the distance between the source and the manikin (0.5–1.5 m). The results showed that the cases considering an initial droplet diameter of 50 μm could cause the largest droplet deposition on the manikin, which was influenced by the combination of droplet gravity and plume. The velocity of the air draught could significantly enhance the inhalation of HCl gas and droplet deposition on the manikin when the velocity was ≥ 0.3 m/s. Furthermore, when the distance was increased from 1.0 to 1.5 m, the thermal plume enhanced the inhalation of HCl gas.

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Section: Introductionmentioning

confidence: 99%

Inhalation and deposition of gas–droplet contaminant in the human microenvironment in an industrial building

Yang

Zhu

Wang

et al. 2023

Indoor and Built Environment

Self Cite

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“…They concluded that the droplet motion is related to the initial droplet diameter and airflow field. Yang et al [ 17 ] numerically investigated the motion of a single sulphuric acid droplet during free fall using the DPM model and found that a 100 μm sulphuric acid droplet, which first decreases in diameter and then maintains a constant equilibrium diameter, can continue to fall in still air until it reaches the surface. In comparison, a 10 μm droplet takes more time.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of an Oil Mist Particle Emission and Gas–Oil Separation Device of a Closed Machine Tool in the Post-Environmental Area

Wang

Liu

Zhao

et al. 2022

IJERPH

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Owing to the airflow field within airtight machines, oil mist particles escape with the airflow from the machine shell gaps and are emitted externally to the post-environmental area, causing air pollution and threatening workers’ health. The existing local exhaust system is ineffective in capturing oil mist particles. This study proposes a gas–oil separation device that can “in-situ control” the oil mist particles in situ and weaken their outgoing emission and that uses numerical simulations to compare and analyse the emission characteristics of oil mist particles, before and after the addition of the separation device at different exhaust air volumes and particle emission speeds, and to design the structural parameters of the device to improve the separation efficiency of oil mist particles. The structural parameters of the proposed device are designed to improve the separation efficiency of oil mist particles. Studies have shown that for every 200 m3/h increase in exhaust air volume, the capture efficiency increases by around 3%, and the particle concentration at the gap in the machine loading door decreases from 9.4 × 10−7 kg/m3 to 7.7 × 10−7 kg/m3. The overall escape rate of oil mist particles is in the range of 10–13% after the addition of a pressure relief device. Numerical simulations are performed to analyse the effects of inlet airflow velocity, folding plate spacing, and folding plate angle on the separation efficiency of oil mist particles. Results show that an increase in the inlet velocity of the airflow increases the particle separation efficiency. The most suitable structural parameters for the separation device and the machine are as follows: 60° angle of the folding plate and 30 mm distance between plates, where the separation efficiency is above 80%, and the average separation efficiency is about 86%. The results of this study can be used as a reference for the study of the emission of oil mist particles from enclosed mechanical cutting machines.

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“…Water droplets were employed to represent the industrial airborne pollutants in the form of droplets. Furthermore, Yang et al (2019) modeled the evaporation of two types of droplets, i.e., hydrochloric and sulfuric droplets under the free-fall condition. The vapor pressure of the evaporable component on the droplet surface was modeled using a correlation generated based on experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the transport, hygroscopic growth, and deposition of multi-component droplets in a simplified airway with realistic thermal boundary conditions

Chen

Zhou

Xia

et al. 2021

Journal of Aerosol Science

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Accurate predictions of the droplet transport, evolution, and deposition in human airways are critical for the quantitative analysis of the health risks due to the exposure to the airborne pollutant or virus transmission. The droplet/particle-vapor interaction, i.e., the evaporation or condensation of the multi-component droplet/particle, is one of the key mechanisms that need to be precisely modeled. Using a validated computational model, the transport, evaporation, hygroscopic growth, and deposition of multi-component droplets were simulated in a simplified airway geometry. A mucus-tissue layer is explicitly modeled in the airway geometry to describe mucus evaporation and heat transfer. Pulmonary flow and aerosol dynamics patterns associated with different inhalation flow rates are visualized and compared. Investigated variables include temperature distributions, relative humidity (RH) distributions, deposition efficiencies, droplet/particle distributions, and droplet growth ratio distributions. Numerical results indicate that the droplet/particle-vapor interaction and the heat and mass transfer of the mucus-tissue layer must be considered in the computational lung aerosol dynamics study, since they can significantly influence the precise predictions of the aerosol transport and deposition. Furthermore, the modeling framework in this study is ready to be expanded to predict transport dynamics of cough/sneeze droplets starting from their generation and transmission in the indoor environment to the deposition in the human respiratory system.

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

Cited by 13 publications

References 36 publications

Inhalation and deposition of gas–droplet contaminant in the human microenvironment in an industrial building

Inhalation and deposition of gas–droplet contaminant in the human microenvironment in an industrial building

Numerical Simulation of an Oil Mist Particle Emission and Gas–Oil Separation Device of a Closed Machine Tool in the Post-Environmental Area

Modeling of the transport, hygroscopic growth, and deposition of multi-component droplets in a simplified airway with realistic thermal boundary conditions

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