Numerical investigation of indoor air quality in a floor heated room with different air change rates

Mutlu, Mustafa

doi:10.1007/s12273-020-0683-5

Cited by 14 publications

(4 citation statements)

References 34 publications

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“…With the increase in the incidence, it has become extremely important to track as accurately as possible scenarios for the behavior of viral microorganisms in an enclosed space. The nature of infectious aerosols is also greatly influenced by room ventilation, human temperature and room temperature 29 , 49 , 50 . Research results 51 confirm that mechanical ventilation can play a role in improving overall health.…”

Section: Introductionmentioning

confidence: 99%

A numerical assessment of social distancing of preventing airborne transmission of COVID-19 during different breathing and coughing processes

Issakhov

Zhandaulet

Omarova

et al. 2021

Sci Rep

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The spread of the novel coronavirus disease (COVID-19) continues to show that geographic barriers alone cannot contain the virus. Asymptomatic carriers play a critical role in the nature of this virus, which is rapidly escalating into a global pandemic. Asymptomatic carriers can inadvertently transmit the virus through the air stream. Many diseases can infect human bodies with tiny droplets or particles that carry various viruses and bacteria that are generated by the respiratory system of infected patients. This article presents the numerical results of the spread of droplets or particles in a room. The proposed numerical model in this work takes into account the sedimentation of particles or droplets under the action of gravitational sedimentation and transport in the room during the process of breathing and sneezing or coughing. Three different cases are numerically investigated taking into account normal breathing and coughing or sneezing, respectively, and three different rates of particle ejection from the mouth are considered. Navier–Stokes equations for incompressible flows were used to describe three-dimensional air flow inside ventilated rooms. The influence of ventilation rate on social distancing is also computationally investigated. It was found that particles can move up to 5 m with a decrease in concentration in the direction of the air flow. The conclusions made in this work show that, given the environmental conditions, the two meter social distance recommended by WHO is insufficient.

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Section: Introductionmentioning

confidence: 99%

A numerical assessment of social distancing of preventing airborne transmission of COVID-19 during different breathing and coughing processes

Issakhov

Zhandaulet

Omarova

et al. 2021

Sci Rep

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“…According to Newton's second law of motion, the force balance equation of single particle motion process is given by equation ( 7): 18,[27][28][29] where u p ! is the velocity vector of aerosol particles, m/ s; g !…”

Section: Aerosol Transport Modelmentioning

confidence: 99%

A numerical research on transient transport of high-temperature particles associated with air gouging process

Han,

Zhuang,

Zhang

et al. 2024

Indoor and Built Environment

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The high-temperature particles produced by air gouging processes are common pollutants in cleaning workshops, which could endanger workers’ health. In this research, a two-way coupled Eulerian-Lagrangian method based on discrete phase modelling (DPM) was used to investigate the transport characteristics of high-temperature particles generated from air gouging processes. The particle group in the movement was divided into core zone and boundary zone, and the kinetic mechanism of particles in different zones was analysed. The results show particles in the boundary zone are more susceptible to the vortex entrainment effect than particles in the core zone, and some particles could be moved from the vortex diffusion zone to the vortex recirculation zone. The smaller the particle size, the better the followability to the hot airflow. The slower the temperature decay of particles, the more significant the thermophoresis effect, which could enhance the diffusion behaviour of the small particles. By analysing the average residence time of particles in the breathing zone, the influence of different factors on the average vertical diffusion height [Formula: see text] of particles is summarized, and a nonlinear regression prediction model of [Formula: see text] is established. The results can contribute to health risk assessment and industrial ventilation design.

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“…Ganesh et al (2019) developed an analytical model to predict the concentration of different kinds of indoor pollutants, which takes contaminants from an Air Handling Unit (AHU) and indoor emission sources into consideration. On the other hand, researchers have carried out numerical simulations by using computational fluid dynamics approaches to explore the physics of particle dispersion, deposition, transportation, emission, and interactions with occupants and indoor airflow fields (Holmberg and Li, 1998;Sajjadi et al, 2017;Liu et al, 2019;Nsir et al, 2019;Borro et al, 2020;Mutlu, 2020;Vuorinen et al, 2020).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

An Experimentally Validated Analytical Model for Aerosol Number Concentration Reduction in Classrooms

Cao

Kuehn

Kim

et al. 2021

Aerosol Air Qual. Res.

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In this study, an analytical model was derived to represent the aerosol number concentration decay in modern classrooms. The model takes various indoor effects into consideration, including filtration efficiency of the air ventilation systems, indoor air cleaners, particle absorption on walls, and particle emission from occupants. Experimental measurements were conducted to determine the wall-loss coefficient and the particle generation rate of occupants. The results predicted by the analytical model agree with the experimental data reasonably well. The behavior of the particle concentration decay under different ventilation scenarios was investigated in the paper. The model has been incorporated into a web-based software that is freely accessible by the public.

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Numerical investigation of indoor air quality in a floor heated room with different air change rates

Cited by 14 publications

References 34 publications

A numerical assessment of social distancing of preventing airborne transmission of COVID-19 during different breathing and coughing processes

A numerical assessment of social distancing of preventing airborne transmission of COVID-19 during different breathing and coughing processes

A numerical research on transient transport of high-temperature particles associated with air gouging process

An Experimentally Validated Analytical Model for Aerosol Number Concentration Reduction in Classrooms

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