Lab-scale electrostatic droplet collection from a fog plume with droplet evaporation

Yuan, Jiang; Liu, Guilian; Porpatham, E.; Yan, Xiaohong

doi:10.1016/j.applthermaleng.2023.120044

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…These sub-models interact with each other and should be so ultaneously. The respiratory droplet migration process is similar to the process in our previous research under the condition without corona discharge [26].…”

Section: Numerical Modelssupporting

confidence: 80%

Numerical Evaluation of the Effect of Buoyancy-Driven Flow on the Migration of Respiratory Droplets

Li,

Yan

2023

Processes

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The understanding of the impact of buoyancy-driven flow on the migration of respiratory droplets remains limited. To investigate this phenomenon, the Lagrangian–Eulerian approach (k-ε turbulent model and discrete phase model) was employed to analyze the interaction between buoyancy-driven flow and coughing activity. The simulation approach was validated by simulating a jet problem in water. Although this problem describes the jet penetration in water, the governing equations for this problem are the same as those for coughing activity in the air. The results demonstrated that an umbrella-shaped airflow was generated above a person and a temperature stratification existed in the room. The buoyancy-driven flow significantly altered the dispersion pattern of the droplets. Notably, for large droplets with an initial diameter of 100 μm, the flow in the boundary layer led to an increased deposition time by about five times. Conversely, for small droplets with an initial diameter of 20 μm, the umbrella-shaped airflow resulted in a more rapid dispersion of droplets and subsequently facilitated their quicker removal by the room walls. After a duration of 300 s, the suspended droplet number of the case with buoyancy-driven flow was 33.4% smaller than that of the case without buoyancy-driven flow. Two or three persons being in the room resulted in a faster droplet removal.

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Section: Numerical Modelssupporting

confidence: 80%

Numerical Evaluation of the Effect of Buoyancy-Driven Flow on the Migration of Respiratory Droplets

Li,

Yan

2023

Processes

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“…We believe the following reasons contribute to these phenomena: (1). Higher temperatures accelerate the evaporation of fog droplets, resulting in a lower quantity of fog droplets captured by the collection electrode [33]. (2).…”

Section: The Influence Of Temperaturementioning

confidence: 99%

Deconstructing plasma fog collection technology: an experimental study on factors impacting collection efficiency

Li,

Xiao

et al. 2023

J. Phys. D: Appl. Phys.

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Water scarcity is a global challenge that hinders human development. In recent years, electrostatic fog collection technology has emerged as a promising technology to alleviate this issue. Although electrostatic fog collectors based on a variety of electrode structures have been developed previously, there has been less research into other factors affecting the efficiency of electrostatic fog collection (e.g. electrical factors, environmental factors, etc), which has delayed the commercial application of the technology. In this paper, we experimentally investigate the effects of power supply polarity, voltage, airflow direction, airflow velocity, fog concentration and temperature on collection efficiency using a typical wire-mesh electrode fog collector as an example. The results show that both electrical and environmental factors influence the collection efficiency by changing the charge and the electric field force of the droplets. Negative polarity corona and high voltage are more favorable for fog collection. High velocity airflow and high fog concentration increase the amount of water collected due to the ability to bring more droplets into the electric field. However, the collection efficiency is reduced by the weakening of the corona discharge. High temperature accelerates the evaporation of fog droplets, which is not favorable for fog collection. In conclusion, this work will not only contribute to revealing the underlying mechanisms of the electrostatic fog collection but also will guide the development of highly efficient fog collectors.

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Numerical investigation of the sensible heat storage in novel electrostatic precipitators with liquid-filled collection electrodes

Yan,

2024

Applied Thermal Engineering

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Lab-scale electrostatic droplet collection from a fog plume with droplet evaporation

Cited by 7 publications

References 41 publications

Numerical Evaluation of the Effect of Buoyancy-Driven Flow on the Migration of Respiratory Droplets

Numerical Evaluation of the Effect of Buoyancy-Driven Flow on the Migration of Respiratory Droplets

Deconstructing plasma fog collection technology: an experimental study on factors impacting collection efficiency

Numerical investigation of the sensible heat storage in novel electrostatic precipitators with liquid-filled collection electrodes

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