Experimental Research and Modeling of Particle Deposition in Ventilation Ducts

Fan, Hongming; Hua, Jing

doi:10.1155/2013/208528

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…Therefore, measured deposition rates were higher than predicted by published models. Fan and Hua [61] corroborated these assumptions (models underestimate the deposition rates) and encouraged the development of more experiments, as proposed by the CleanAirNet project in the case of large ventilation ducts with turbulent flow.…”

Section: Experimental Approaches For Particle Depositionmentioning

confidence: 72%

“…Modeling and computer simulation dynamics have been used to apprehend the fates of airborne particles in ventilation ducts with turbulent flow [56,58,[61][62][63]. In the frame of the CleanAirNet project and based on the knowledge acquired under real situations, Ben Othmane et al [54] have proposed improvements to existing Eulerian models that predict particle deposition velocity with turbulent flow in common-used ventilation ducts.…”

Section: Particle Deposition: Definitions and Modelingmentioning

confidence: 99%

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Preventing Indoor Bioaerosol Contamination in Food Processing Environments and HVAC Systems: Assessment of Particle Deposition for Hygienic Design Purposes

Gehin

Havet

et al. 2014

The Handbook of Environmental Chemistry

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This chapter deals with airborne particle contamination in food processing indoor environments and particularly within heating, ventilation, and air-conditioning (HVAC) systems in food factory buildings. The major types of bioaerosols encountered in the food manufacturing sector as well as the bioaerosol sampling methods are firstly introduced. Secondly, some features of air handling systems such as zoning, cleanrooms, localized air handling systems, and HVAC systems are presented. Besides, the study of particle deposition to duct surfaces from turbulent airflow is reviewed and discussed. Substantially, an original work combining industrial diagnosis and experiments at factory scale with experiments at laboratory scale is then proposed through the case study of the CleanAirNet project. The CleanAirNet project (Hygienic Design of Ventilation Duct Networks in Food Factories) aimed at producing new knowledge, models, and techniques to help control the safety of the food products through a better control of aerosol particle transport and deposition in the ventilation networks of the food industry. The different work packages of the project are presented relatively to the state-of-theart particle deposition on duct surfaces. The methodological findings and relevant applications (e.g., a newly patented particle trapping device for air handling systems) for food industries are exposed. The

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Section: Experimental Approaches For Particle Depositionmentioning

confidence: 72%

Section: Particle Deposition: Definitions and Modelingmentioning

confidence: 99%

Preventing Indoor Bioaerosol Contamination in Food Processing Environments and HVAC Systems: Assessment of Particle Deposition for Hygienic Design Purposes

Gehin

Havet

et al. 2014

The Handbook of Environmental Chemistry

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“…28 Air conditioners ensure the required suitable indoor environmental quality by locally adjusting the indoor temperature and humidity, which could affect the particle resuspension process. Fan and Hua 29 observed a linear relationship between the mass of resuspension and deposited dust in ventilation ducts. Zhao et al 30 carried out large-eddy simulations of particle resuspension in fully developed turbulent square duct flows and found turbulence can have a significant impact on resuspension.…”

Section: Introductionmentioning

confidence: 97%

Characteristics of indoor human-induced particle resuspension under different ventilation conditions

Sun

Zheng

et al. 2022

Indoor and Built Environment

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This study performed a series of experiments to study the characteristics of human-induced particle resuspension under different ventilation conditions. Four modes of supplied airspeed were evaluated: no wind, low wind (2.742 m/s), medium wind (3.849 m/s) and high wind (4.422 m/s). Results show that the steady-state particle concentration can be approximated as a linear function of the airspeed. Human walking and ventilation conditions can have a significant and coupling role in particle behaviours. In particular, human walking provides initial energy for resuspension by disturbing the local fields, and thus increases the resuspension, especially for large particles of 5–10 μm in size. The wind has two competitive effects, that is, supplying energy to keep particles suspended and pushing the particles downward, and the latter becomes dominant when the airspeed was too high. Consequently, intermediate airspeeds can intensify the effect of human walking, and introduce higher peaks of particle concentration in the human-walking stages. As for the particle number density, similar conclusions can be drawn that the effect of ventilation conditions is more pronounced on small particles less than 1 μm while that of human walking is on large particles. This work lays a foundation for revealing the particle resuspension mechanism.

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“…This action improves the tissues uptake of the drug and accordingly enhances its anticancer effect. Several other studies, both experimentally and theoretically, have been performed to discuss some of the characterizations that are related to aerosols transport and deposition and their applications [8][9][10][11][12][13][14][15]. Due to the complicated details involved, the actual methods by which an AP can transfer and settle down are not yet entirely comprehended.…”

Section: Introductionmentioning

confidence: 99%

Modified description for deposition of particles in small volumes

Orabi¹

2023

Phys. Scr.

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Different elements that control the concentrations and doses from radioactive particles are in need to be elaborately studied. From theoretical point of view, this requires improving the models that describe the controlling elements of the behaviors and dynamics of the particles. An important element is the deposition of the particles onto surfaces within small volumes, like gaps in buildings’ shells. This element is studied in this article by developing a modified theoretical scheme built by starting with the Fick;s 1st law of diffusion . Velocities of depositions are calculated by taking into account the turbulent and brownian diffusion mechanisms within the boundary layer . The dependence of the particle’s eddy diffusion coefficient on the distance close to the surface is expressed by a fourth power relation. This relation has only one free parameter. The model considers the boundary layer to be composed of only one region. The value of the free parameter is determined in relation to the friction velocity . Particles sizes of 1 nm – 100 μ m are studied. The obtained resulted are presented in comparison to one of the famous theoretical models. Agreeing with experiments, the proposed model shows a promising success and provides a deeper vision to describing the turbulence inside small-sized spaces. Additionally, it gives a new definition to the form and size of the boundary layer .

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Experimental Research and Modeling of Particle Deposition in Ventilation Ducts

Cited by 5 publications

References 14 publications

Preventing Indoor Bioaerosol Contamination in Food Processing Environments and HVAC Systems: Assessment of Particle Deposition for Hygienic Design Purposes

Preventing Indoor Bioaerosol Contamination in Food Processing Environments and HVAC Systems: Assessment of Particle Deposition for Hygienic Design Purposes

Characteristics of indoor human-induced particle resuspension under different ventilation conditions

Modified description for deposition of particles in small volumes

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