Human induced flow field and resultant particle resuspension and transport during gait cycle

Goldasteh, Iman; Tian, Yilin; Ahmadi, Goodarz; Ferro, A.

doi:10.1016/j.buildenv.2014.03.016

Cited by 58 publications

(22 citation statements)

References 40 publications

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“…Owing to its simplicity G Model NED-8218; No. of Pages 8 T. Barth et al / Nuclear Engineering and Design xxx (2015) xxx-xxx 5 the force/moment balance concept was implemented in various CFD codes for the simulation of various particle resuspension in various geometries Fu et al, 2013;Goldasteh et al, 2013a,b;Goldasteh et al, 2014;Guingo and Minier, 2008). The second model is the energy balance concept which was first introduced by Reeks et al (1988) and is based on an energy transfer from the turbulent flow to a particle sitting in a potential well.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In the indoor environment, for example, the airflow induced by a footstep during a human gait cycle may cause particle resuspension and result in an increase of inhalable particles (Goldasteh et al, 2014). These particles may also accumulate in building ventilation systems leading to the formation of particle deposits, which may re-enter the flow and cause the transmission of respiratory diseases (Holopainen et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Particle deposition and resuspension in gas-cooled reactors—Activity overview of the two European research projects THINS and ARCHER

Barth

Lecrivain

Jayaraju

et al. 2015

Nuclear Engineering and Design

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Particle deposition and resuspension in gas-cooled reactors—Activity overview of the two European research projects THINS and ARCHER

Barth

Lecrivain

Jayaraju

et al. 2015

Nuclear Engineering and Design

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“…Particle resuspension is due to high-speed airflows generated in the vicinity of the shoe during the gait cycle (Khalifa and Elhadidi, 2007). Goldasteh et al (2014) investigate the airflow field during walking using a 3D numerical model of a moving shoe. Their results show the formation of a high-velocity region under the foot during the gait cycle.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the airflow generated by the human foot tapping using the hot-wire anemometry

Benabed

Limam

Janssens

et al. 2020

Journal of Building Physics

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Human-walking-induced particle resuspension in indoor environments is believed to be an important source of particulate matter. Aerodynamic disturbance generated by the human foot during a gait cycle are the main driver for particle detachment and dispersion in the room. In this work, the hot-wire anemometry technique was employed to investigate the airflow generated by one phase of the human gait cycle: the foot tapping. This phase was simulated by a mechanical simulator that consists of a wooden rectangular 25 × 8 × 1.2 cm plate, and a servomotor that allows downward and upward rotations of the plate with a constant velocity. A correction procedure based on the hot-wire velocity measurements and the analytical solution of Falkner–Skan has been derived to correct the hot-wire readings in the near-wall region. Results show a sharp increase of airflow velocity in front of the simulator after the simulator rotation. Transverse hot-wire measurements downstream of the simulator show that the profile of the maximal velocities reaches a peak at a distance y = 8 × 10−3 m from the wall. The expulsed air from the volume under the simulator propagates downstream from the foot to reach near zero velocity values at 0.15 m away from the top of the simulator.

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“…Hang et al [17] reported ventilation design and air change rates in a six-bed isolation room affected airborne transmission much more than human motion. Goldasteh [18] and Wang and Chow [19] found that human motion can significantly influence particle re-suspension and particle dispersion in the isolation room. Most airborne transmissions are via dispersion of droplets/ particles.…”

Section: Introductionmentioning

confidence: 99%

Potential airborne transmission between two isolation cubicles through a shared anteroom

Hang

Ching

et al. 2015

Building and Environment

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a b s t r a c tFull-scale experiments and CFD simulations were performed to study potential inter-cubicle airborne transmissions through a shared anteroom due to the hinged door opening. When doors are closed, current negative pressure designs are effective for the containment of airborne pathogens in the 'dirty' cubicle with an index patient. When the 'dirty' cubicle door is open, airborne agents can move into the other 'clean' cubicle via the shared anteroom. As the door being opened or closed, the door sweeping effect is the main source of the two-way airflow and contaminant exchange through the doorway. When the dirty cubicle door remains fully open, temperature difference and concentration gradient across the doorway induce the two-way buoyancy-driven flow and transport of airborne agents across the doorway. The longer the dirty cubicle door remains fully open (10 s, 30 s or 60 s) or the smaller the air change rate (34e8.5 ACH for each cubicle), the more airborne pathogens are being transported into the 'clean' cubicle and the longer time it takes to remove them after the door is closed. Keeping the door completely open is potentially responsible for the majority of inter-cubicle transmissions if its duration is much longer than the duration of door motion (only 3 s). Our analyses suggest a potential inter-cubicle infection risk if the shared anteroom is used for multiple isolation cubicles. Decreasing the duration of door opening, raising air change rate or using a curtain at the doorway are recommended to reduce inter-cubicle exposure hazards.

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Human induced flow field and resultant particle resuspension and transport during gait cycle

Cited by 58 publications

References 40 publications

Particle deposition and resuspension in gas-cooled reactors—Activity overview of the two European research projects THINS and ARCHER

Particle deposition and resuspension in gas-cooled reactors—Activity overview of the two European research projects THINS and ARCHER

Experimental investigation of the airflow generated by the human foot tapping using the hot-wire anemometry

Potential airborne transmission between two isolation cubicles through a shared anteroom

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