Indoor Air Aerosol Model: Transport Indoors and Deposition of Fine and Coarse Particles

Raunemaa, T.; Kulmala, Markku; Saari, Helena; Olin, Markus; Кулмала, Мэри

doi:10.1080/02786828908959296

Cited by 94 publications

(55 citation statements)

References 9 publications

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“…Human activity is considered the main reason causing indoor particle resuspension, which leads to human secondary exposure to PM (Clayton et al 1993;Kamens et al 1991;Lefcoe and Inculet 1975;Lioy et al 1990;Raunemaa et al 1989;Thatcher and Layton 1995). Research (Hu et al 2005) shows that the disturbance forces on particles introduced by human activity are a few orders of magnitude lower than the particle adhesion force predicted by theoretical models.…”

Section: Introductionmentioning

confidence: 99%

Measurements and Factorial Analysis of Micron-Sized Particle Adhesion Force to Indoor Flooring Materials by Electrostatic Detachment Method

Freihaut

Bahnfleth

et al. 2008

Aerosol Science and Technology

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Airborne concentration of micron-sized particulate matter (PM) is an important index of indoor air quality. While human activity is considered the main reason causing indoor particle resuspension, theoretical particle adhesion force models give predictions of adhesion force much larger than the disturbance forces introduced by human activity. This work suggests that the imperfect contact between particles and surfaces can greatly reduce the adhesion bond. Electrostatic detachment method is used to measure the actual adhesion force distribution of micron-sized particles to such common indoor flooring materials as vinyl and rubber. Comparisons are made between the theoretical predictions and experimental measurements. Factorial experiments are also designed to study the influence of particle type, flooring type and contact time on particle adhesion force.

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Section: Introductionmentioning

confidence: 99%

Measurements and Factorial Analysis of Micron-Sized Particle Adhesion Force to Indoor Flooring Materials by Electrostatic Detachment Method

Freihaut

Bahnfleth

et al. 2008

Aerosol Science and Technology

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“…Surface topography effects may also arise in deposition sampling protocols. For instance, depositing particles are sometimes collected on a sampling medium of finite thickness that is mounted on an indoor surface (Raunemaa et al, 1989;Ligocki et al, 1990). The disturbance in the particle concentration boundary layer caused by even a thin collection plate may lead to deposition onto the device that differs from that onto the adjacent wall.…”

Section: Boundary-layer Length Scalesmentioning

confidence: 99%

Effect of Small-Scale Obstructions and Surface Textures on Particle Deposition from Natural Convection Flow

Thatcher

Nazaroff

1997

Aerosol Science and Technology

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ABSTRACT. To increase knowledge of particle dynamics in indoor environments, we have conducted experiments on the effects of small surface discontinuities and roughness on deposition from natural convection flow. Measurements were made in a half-height (1.22 m) aluminum test chamber and in a full-scale experimental room. In the test chamber, air flow was induced by uniformly heating the floor and one wall while cooling the ceiling and opposite wall to a constant temperature difference of 3 K. In the full-scale room, one wall was heated and the opposite wall was cooled to a constant wall-to-wall temperature difference of 3 or 7 K. Other surfaces in both experiments were approximately adiabatic. Near-monodispersed fluorescent particles (diameters 0.1, 0.5, or 1.3 p m in the half-height experiments and 0.2 or 1.0 p m in the full-scale experiments) were injected into the chamber. Following an exposure period, the mass of fluorescent particles deposited on sections of the walls and/or plates mounted on the walls were extracted and measured by fluorometry. The effect of surface discontinuities was explored by comparing deposition onto the walls or onto flush-mounted plates with deposition onto thin, smooth, surface-mounted plates. The effect of surface roughness was investigated by measuring deposition onto textured plates (finely scratched, a rectangular array of 2.4 mm balls, or skip-coat drywall texture). Deposition of the smallest particles (0.1 and 0.2 pm) was relatively insensitive to surface obstructions and texture, but the effect of roughness increased with particle size. For 1.3 p m particles, deposition to the roughest surface was as much as five times greater than deposition to a smooth wall. The effect of surface roughness was greater for vertical surfaces than horizontal and for warm surfaces than cool. Deposition velocities measured with a 3 K temperature difference are fairly consistent between the full-scale room and the half-height chamber. Overall, surface roughness of the type commonly found indoors can significantly impact deposition rates, and, therefore, many real surfaces cannot be assumed to be smooth when analyzing particle deposition in indoor environments.

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“…Below, the contamination model is briefly reviewed. Deposition is characterised by a set of equations (see, e.g., Raunemaa et al, 1989): Figure 17. Test cases D10_0, D10_AA, D10_A, D100_0, D100_AAA and D1000_A.…”

Section: Simplified Contamination Model For Particle Accumulation Estmentioning

confidence: 99%

“…In order to calculate long-term contamination of mobile electronic devices, we modified our indoor model (Raunemaa et al, 1989) to create a phone contamination model to suit these new conditions. Below, the contamination model is briefly reviewed.…”

Section: Simplified Contamination Model For Particle Accumulation Estmentioning

confidence: 99%

New Methods to Model and Simulate Both Air Exchange and Particle Contamination of Portable Devices

Olin¹,

Laakso

Hannula

et al. 2008

Modelling and Simulation

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Indoor Air Aerosol Model: Transport Indoors and Deposition of Fine and Coarse Particles

Abstract: Mass and elemental concentrations of particles were determined in indoor and outdoor air in urban and suburban Helsinki, Finland. The effects of outdoor-toindoor transport and indoor sources on indoor particle concentrations were studied in detail. Resuspension and

Cited by 94 publications

References 9 publications

Measurements and Factorial Analysis of Micron-Sized Particle Adhesion Force to Indoor Flooring Materials by Electrostatic Detachment Method

Measurements and Factorial Analysis of Micron-Sized Particle Adhesion Force to Indoor Flooring Materials by Electrostatic Detachment Method

Effect of Small-Scale Obstructions and Surface Textures on Particle Deposition from Natural Convection Flow

New Methods to Model and Simulate Both Air Exchange and Particle Contamination of Portable Devices

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