Source term models for fine particle resuspension from indoor surfaces

Kim, Yoojeong; Gidwani, Ashok; Wyslouzil, Barbara E.; Sohn, Chang W.

doi:10.1016/j.buildenv.2010.02.016

Cited by 37 publications

(40 citation statements)

References 38 publications

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“…3. Ferro et al (2004) concluded that submicron particles only contribute to less than 1% of the suspended particle number concentration (Kim et al, 2010). In this study it was observed that PN 0.1-0.3 and PN 0.3-0.5 were fairly stable throughout the day, which almost excluded the influence of resuspension from decorative flooring by tourists' movements on PNC.…”

Section: The Impact Of Decorative Flooringmentioning

confidence: 46%

“…Resuspension rate is the net result of adhesion forces and removal forces acting concurrently on particles deposited on a surface. Regarding the adhesion force, it includes the van der Waals force, the electrostatic force, and the capillary force, a among of which, van der Waals force was the main force impacted by the visitor movement, and worked between the particles and the nearby surface (Kim et al, 2010). It is decided by the Hamaker constant (Ge et al, 2013) and the separation distance between the particle and the surface.…”

Section: The Impact Of Decorative Flooringmentioning

confidence: 99%

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Characterizing Particulate Pollutants in an Enclosed Museum in Shanghai, China

Wang

Xiu

Chen

et al. 2015

Aerosol Air Qual. Res.

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The present study reported simultaneous measurements of particle number concentration (PNC), particle mass concentration, water soluble organic carbon (WSOC), organic carbon (OC), elemental carbon (EC), particulate morphology and main elemental properties. The measurements were conducted in a museum located in the downtown area of Shanghai. The impacts of storey, particle size and decorative flooring on particle characteristics inside museum were investigated. Size fractionated PNC in display halls belonging to the same storey exhibited similar daily variations. Particles within the range of 0.3-0.5 µm were identified as the most significant contributors to the overall size distribution measured, as ambient fine particles penetrated through the mechanical ventilation system. Multi-lognormal fitting OC concentrations can be assigned to the presence of tourists in the museum or originate from secondary OC formation. The latter can be estimated by comparing the relationship between OC and EC, as well as OC and WSOC.

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Section: The Impact Of Decorative Flooringmentioning

confidence: 46%

Section: The Impact Of Decorative Flooringmentioning

confidence: 99%

Characterizing Particulate Pollutants in an Enclosed Museum in Shanghai, China

Wang

Xiu

Chen

et al. 2015

Aerosol Air Qual. Res.

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“…Here, resuspension is the process by which particles are reintroduced into the air from a surface on which they were previously deposited. Although the first scientific studies of resuspension processes focused on soil erosion and the related transport of dust, recent studies have found that particle resuspension in indoor microenvironments could be an important factor in indoor air quality evaluation (Kim et al, 2010). Indeed, this process is strongly related to the transmission of human diseases and the dispersion of allergens (Thatcher and Layton, 1995;Hu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Particle Resuspension in School Gyms during Physical Activities

Buonanno

Fuoco

Marini

et al. 2012

Aerosol Air Qual. Res.

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The aim of this work was to quantify the exposure of children to particle resuspension in school gyms. In fact, although moderate standard aerobic activity is suggested for good health, adverse health effects could affect people exercising in micro-environments with ambient pollution. Overall, 12 micro-environments were chosen and analyzed in a 3-month experimental campaign. The different fractions of particulate matter (PM) were measured by means of photometers, calibrated for the specific aerosols studied through gravimetric samplers, whereas particle number distributions in the 0.5-20 μm range were continuously measured using an Aerodynamic Particle Sizer (APS) spectrometer. High PM concentration levels were measured in school gyms compared to outdoor values. The dominant source is the particle resuspension produced by the activity of exercising pupils and, among the various PM fractions, the effect on coarse particles (PM 10-2.5 ) was found to be the most important, with the related emissions factors measured in the range of 1.5-8.9 mg/min. During school activities, under natural ventilation conditions, the average coarse particle concentrations at the 12 school gyms investigated were found to be 4.8 ± 2.0 times higher than the background (outdoor) values. The key parameters are the number and intensity of the physical activities, which can be characterized by the total energy used by the students. Therefore, this study provides useful data on the exposure of students to airborne particles during periods of physical activity in gyms with natural ventilation.

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“…For comparison, the analytical model earlier developed by Kim et al (2010) was also used to verify the resuspension rate calculations, (Equation (8)). …”

Section: Particle Detachment and Resuspension Ratementioning

confidence: 99%

“…However, most of the existing data were obtained months to years after initial deposition. These long-term data sets are poor surrogates for short-term emergency response scenarios (Kim et al 2010).…”

Section: Introductionmentioning

confidence: 99%

High Resolution Study of Micrometer Particle Detachment on Different Surfaces

Kassab

Ugaz

King

et al. 2013

Aerosol Science and Technology

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In an effort to identify particle initial motion prior liftoff interactions of micrometer glass beads (10-100 µm) on glass, ceramic, and hardwood substrates were investigated experimentally. Particles were deposited on the lower surface of a 10 cm 2 wind tunnel by gravitational settling. Air flows were imposed from an open entrance at average velocities up to 16 m/s. Individual particle trajectories obtained by high-speed imaging reveal three different types of motion: rolling/bouncing (saltation caused by the movement of hard particles over an uneven surface in a turbulent flow of air), immediate liftoff (particles completely leave the surface with no or minimal initial rolling/bouncing) and complex motion (particles travel with rolling/bouncing motion on the surface for a certain distance before final liftoff). Surface roughness significantly affects the particle initial motion prior to liftoff. The majority of particle trajectories from the glass substrate were parallel to the surface with complex motion. Hardwood substrates took the longest time for initial particle movement (t >1 s) causing a more rapid liftoff. The ceramic substrate showed the most rolling/bouncing motion, for 80% of the particles. The detachment percentage initially follows an exponentially increasing trend for a period of ∼1 s, followed by a plateau phase for a period of 5 s. Changing the velocity, substrate, and particle size significantly affects particle detachment. Incorporating the different types of particle motion prior to liftoff into detachment mode models, and understanding how their relative contributions change with different particle and substrate materials, can potentially yield improved predictive capabilities.

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Source term models for fine particle resuspension from indoor surfaces

Cited by 37 publications

References 38 publications

Characterizing Particulate Pollutants in an Enclosed Museum in Shanghai, China

Characterizing Particulate Pollutants in an Enclosed Museum in Shanghai, China

Particle Resuspension in School Gyms during Physical Activities

High Resolution Study of Micrometer Particle Detachment on Different Surfaces

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