On the Impact of the Human (Child) Microclimate on Passive Aerosol Monitor Performance

Eisner, Alfred D.; Heist, David; Drake, Z. E.; Mitchell, William J.; Wiener, Russell W.

doi:10.1080/0278682029009250

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…When the manikin was heated in quiescent indoor conditions (reference case), the CBL was able to pull the particles from the feet to the breathing zone resulting in 5.8 times higher averaged exposure compared to the case with no CBL. This result is aligned with the results of other studies (Brohus and Nielsen, ; Eisner et al., ) which showed that the CBL was able to increase inhaled concentration of pollution compared to the ambient concentration when the pollution source was located near the occupant. In case of the unheated manikin in quiescent indoor conditions (No CBL), a small portion of particles ended up in the breathing zone due to the absence of the CBL.…”

Section: Resultssupporting

confidence: 91%

“…It has already been documented that the CBL plays an important role in pollution transport around a human body (Brohus and Nielsen, ; Eisner et al., ). Rim and Novoselac () found that in the stratified environment, the inhaled concentrations of the pollution located 0.5 m behind an occupant and 0.15 m above the floor was four times higher than the ambient concentration.…”

Section: Introductionmentioning

confidence: 99%

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Human convection flow in spaces with and without ventilation: personal exposure to floor-released particles and cough-released droplets

et al. 2015

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Human convection flow in spaces with and without ventilation: personal exposure to floor-released particles and cough-released droplets

et al. 2015

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“…Flow quality in the wind tunnel at low wind speeds was investigated (Eisner et al, 2002) and improved. In order to straighten the ow and decrease the turbulence levels, a ow-straightening honeycomb is used in the wind tunnel at the junction between the contraction and the test section.…”

Section: Methodsmentioning

confidence: 99%

Verification and validation studies of the time-averaged velocity field in the very near-wake of a finite elliptical cylinder

Flynn

Eisner²

2004

Fluid Dyn. Res.

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This paper presents veriÿcation and validation results for the time-averaged, three-dimensional velocity ÿeld immediately downstream of a ÿnite elliptic cylinder at a Reynolds number of 1:35×10 4 . Numerical simulations were performed with the ÿnite element package, Fidap, using the steady state, standard k-epsilon model. The ratio of the cylinder height to the major axis of the elliptical cross section is 5.0; the aspect ratio of the cross section is 0.5625. This particular geometry is selected as a crude surrogate for the human form in consideration of further applied occupational and environmental health studies. Predictions of the velocity and turbulence kinetic energy ÿelds in the very near-wake are compared to measurements taken in a wind tunnel using laser Doppler anemometry. Results show that at all locations where a reliable grid convergence index can be calculated there is not a demonstrable di erence between simulated and measured values. The overall topology of the time-averaged ow ÿeld is reasonably well predicted, although the simulated near-wake is narrower than the measured one.

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“…Recent research in the so-called "personal dust cloud" suggest that human activities, such as walking and running, cause the resuspension of particulate matter (PM) attached to the floor, and for as much as a 60% increase in PM concentration in the human breathing zone compared with the room background concentration (Ferro et al 2004). This is of particular concern for children and toddlers who spend a considerable amount of time close to the floor (Eisner et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Particle Levitation Due to a Uniformly Descending Flat Object

Khalifa

Elhadidi

2007

Aerosol Science and Technology

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This article presents analytical and computational fluiddynamics (CFD) solutions of the unsteady flow resulting from a horizontal circular disk moving downward at a constant velocity toward a horizontal floor seeded with spherical micro-particles, and the effect of this flow on particle detachment and levitation. The selected configuration is a simplification of numerous practical applications in which particle resuspension is important, for example a foot or an object impacting a dusty floor, or a squeeze film thrust bearing with particle contamination. The resulting radial and axial velocity field, coupled with a particle detachment model and the particle equations of motion were employed to compute particle trajectories in the gap. The CFD solutions were utilized to describe the high-speed radial wall jet and the vortices developing outside the disk and to explain their role in particle levitation and entrainment. It is shown that as the gap narrows the resulting radial velocity close to the disk perimeter is high enough to detach and levitate μm-size particles, and that the vortices shed by the descending disk and its high-velocity radial wall jet create an upward convective motion that contributes to particle resuspension from the floor and entrainment in any far-field flow that might be present around the descending disk.

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On the Impact of the Human (Child) Microclimate on Passive Aerosol Monitor Performance

Cited by 4 publications

References 21 publications

Human convection flow in spaces with and without ventilation: personal exposure to floor-released particles and cough-released droplets

Human convection flow in spaces with and without ventilation: personal exposure to floor-released particles and cough-released droplets

Verification and validation studies of the time-averaged velocity field in the very near-wake of a finite elliptical cylinder

Particle Levitation Due to a Uniformly Descending Flat Object

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