Stability and accuracy of numerical investigation of droplet motion under local ventilation airflow

Yang, Yang; Wang, Yi; Song, Bingbing; Fan, Jinping; Cao, Yingxue

doi:10.1016/j.buildenv.2018.05.023

Cited by 44 publications

(9 citation statements)

References 33 publications

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“…The diameter of the droplet is a dynamic property due to the liquid evaporation under certain indoor air conditions. Those conditions are resulting in droplet shrinking by time which finally leads to the formation of the stable droplet nuclei (Ji et al 2018 ; Li et al 2018 ; Liu et al 2019a , b , c , d , e ; Liu et al 2017 ; Morawska et al 2009 ; Wang et al 2019a , b ; Wei and Li 2015 ; Xie et al 2007 ; Yang et al 2018 ).…”

Section: Droplet Formation Mechanismsmentioning

confidence: 99%

“…In the case of droplets, it should be also considered the effect of droplet’s evaporation (Ji et al 2018 ; Li et al 2018 ; Liu et al 2019a , b , c , d , e ; Liu et al 2017 ; Morawska et al 2009 ; Wang et al 2019a , b ; Wei and Li 2015 ; Xie et al 2007 ; Yang et al 2018 ). A characteristic example of the effect of the relative humidity ( RH ) of air in water droplets of 50-μm diameter is that they will evaporate at RH = 50% in less than 3 s (Vuorinen et al 2020 ).…”

Section: Droplet Formation Mechanismsmentioning

confidence: 99%

“…Evaporation is a very fast molecular process, for instance, a 20-µm droplet evaporates to 1-µm diameter droplet within only a rate of 0.24 s −1 at 50% ambient relative humidity (Yang et al 2018 ; Ai and Melikov 2018 ). Due to the evaporation phenomenon, the size of the droplets is affected by time, as they are shrinking and this is prominent for droplets with an initial diameter of 100 μm (Yang et al 2018 ).…”

Section: Droplet Formation Mechanismsmentioning

confidence: 99%

See 2 more Smart Citations

Airborne transmission of biological agents within the indoor built environment: a multidisciplinary review

Argyropoulos

Skoulou

Efthimiou

et al. 2022

Air Qual Atmos Health

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The nature and airborne dispersion of the underestimated biological agents, monitoring, analysis and transmission among the human occupants into building environment is a major challenge of today. Those agents play a crucial role in ensuring comfortable, healthy and risk-free conditions into indoor working and leaving spaces. It is known that ventilation systems influence strongly the transmission of indoor air pollutants, with scarce information although to have been reported for biological agents until 2019. The biological agents’ source release and the trajectory of airborne transmission are both important in terms of optimising the design of the heating, ventilation and air conditioning systems of the future. In addition, modelling via computational fluid dynamics (CFD) will become a more valuable tool in foreseeing risks and tackle hazards when pollutants and biological agents released into closed spaces. Promising results on the prediction of their dispersion routes and concentration levels, as well as the selection of the appropriate ventilation strategy, provide crucial information on risk minimisation of the airborne transmission among humans. Under this context, the present multidisciplinary review considers four interrelated aspects of the dispersion of biological agents in closed spaces, (a) the nature and airborne transmission route of the examined agents, (b) the biological origin and health effects of the major microbial pathogens on the human respiratory system, (c) the role of heating, ventilation and air-conditioning systems in the airborne transmission and (d) the associated computer modelling approaches. This adopted methodology allows the discussion of the existing findings, on-going research, identification of the main research gaps and future directions from a multidisciplinary point of view which will be helpful for substantial innovations in the field.

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Section: Droplet Formation Mechanismsmentioning

confidence: 99%

Section: Droplet Formation Mechanismsmentioning

confidence: 99%

Section: Droplet Formation Mechanismsmentioning

confidence: 99%

See 1 more Smart Citation

Airborne transmission of biological agents within the indoor built environment: a multidisciplinary review

Argyropoulos

Skoulou

Efthimiou

et al. 2022

Air Qual Atmos Health

View full text Add to dashboard Cite

show abstract

“…With enough droplets included in the simulation, it is possible to recover some statistical properties of the droplet swarm. In this regard, the Lagrangian scheme is used widely to analyze droplet transport in indoor environments, and relevant results have been obtained for the spatial distribution of droplets 223 and their trajectories and traveling abilities. 125,224 It is also used widely to investigate the deposition of micrometer-sized droplets/particles in the RT.…”

Section: Transport and Evolution Of Pathogen-laden Dropletsmentioning

confidence: 99%

A dynamical overview of droplets in the transmission of respiratory infectious diseases

Zhou

Zou

2021

Physics of Fluids

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The outbreak of the coronavirus disease has drawn public attention to the transmission of infectious pathogens, and as major carriers of those pathogens, respiratory droplets play an important role in the process of transmission. This Review describes respiratory droplets from a physical and mechanical perspective, especially their correlation with the transmission of infectious pathogens. It covers the important aspects of (i) the generation and expulsion of droplets during respiratory activities, (ii) the transport and evolution of respiratory droplets in the ambient environment, and (iii) the inhalation and deposition of droplets in the human respiratory tract. State-of-the-art experimental, computational, and theoretical models and results are presented, and the corresponding knowledge gaps are identified. This Review stresses the multidisciplinary nature of its subject and appeals for collaboration among different fields to fight the present pandemic.

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“…However, in-depth and detailed mechanisms of these problems are still unavailable. In practice, the booming experimental testing technology [12][13][14][15] and numerical simulation technology [16][17][18][19] have been useful research methods for greatly improving the efficiency of ventilation systems.…”

Section: Efficient Ventilation Design For Industrial Buildingsmentioning

confidence: 99%

Energy efficiency of industrial buildings

Wang

Cao

Meng

2019

Indoor and Built Environment

Self Cite

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Industrial buildings are playing an important role in national construction and economic development. The total constructed floor area of industrial buildings in China is over 500 million square metres per year since 2011. Up till now, the total area of existing industrial buildings is over 10 billion square metres. However, simultaneously, the areas of single industrial buildings have been expanding to occupy larger spaces. 1 The energy consumption of industrial building is the sum of the energy consumed during the entire lifetime of the building, rather than just the energy consumption for industrial production. 2 The consideration of energy consumption of industrial buildings mainly focuses on the heating, ventilation and air conditioning (HVAC) systems. This type of energy consumption accounts for rather a smaller proportion when compared to energy consumption for production. However, its absolute value cannot be overlooked. Therefore, how to effectively save the energy consumption of industrial buildings has become one of the most urgent problems in the field of built environment and energy efficiency. The differences in the energy efficiency design between industrial and civil buildingsThe indoor environment of industrial buildings should meet requirements of indoor operators, production, animal welfare, as well as safety and explosion protection. 3 Therefore, environmental control technology and energy efficiency design of industrial and civil buildings are oriented toward different foci, so as to solve different scientific problems using different methods. Due to the diversity of technological conditions in industrial production, the control requirements of industrial buildings' indoor environments differ with different types of industries, for example, industrial buildings with high pollution emissions and clean room. In addition, there are significant differences between industrial and civil buildings in architectural form. Compared with civil buildings, industrial buildings with smaller shape coefficient and window to wall ratio are simple and practical.Therefore, the energy efficiency designs of industrial and civil buildings are very different in both basic principles and technological strategies. Employing the energy efficiency methods of civil buildings directly to industrial buildings usually leads to unsatisfatory results. Thus, when we explore the energy efficiency design of industrial buildings, innovation should be further developed on the basis of existing technologies for civil buildings. Strictly speaking, principles and ideas of energy efficiency of civil buildings can be used for reference and learning, but a new energy efficiency design system should be formed, and novel contents should be added, centred on indoor sources (heat source and pollution source), enclosure structure and equipment system characteristics of industrial buildings.

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Stability and accuracy of numerical investigation of droplet motion under local ventilation airflow

Cited by 44 publications

References 33 publications

Airborne transmission of biological agents within the indoor built environment: a multidisciplinary review

Airborne transmission of biological agents within the indoor built environment: a multidisciplinary review

A dynamical overview of droplets in the transmission of respiratory infectious diseases

Energy efficiency of industrial buildings

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