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Research Papers: Flows in Complex Systems

An Experimental Investigation of the Flowfield and Dust Resuspension Due to Idealized Human Walking

[+] Author and Article Information
Yoshihiro Kubota, Hiroshi Higuchi

Department of Mechanical and Aerospace Engineering, Syracuse University, Syracuse, NY 13244

Joseph W. Hall

Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada

J. Fluids Eng 131(8), 081104 (Jul 24, 2009) (6 pages) doi:10.1115/1.3176962 History: Received July 08, 2008; Revised May 28, 2009; Published July 24, 2009

In order to address how human foot movement causes particles to be resuspended from the floor, particle flow visualization and particle image velocimetry (PIV) measurements were performed on a simplified model of the human walking motion; a disk moving normal to the floor. Flow visualization of particles, seeded initially on the ground, indicates that particles are resuspended by both the downward and upward motions of the walking process. On both the upstep and the downstep, particle resuspension occurs due to a high velocity wall jet, forming between the wall and the disk in general accord with the mechanism for particle resuspension put forth by Khalifa and Elhadidi (2007, “Particle Levitation Due to a Uniformly Descending Flat Object,” Aerosol Sci. Technol., 41, pp. 33–42). Large-scale ring vortex structures were formed on both the downstep and the upstep, and did not cause particle resuspension, but were extremely effective at quickly moving the already resuspended particles away from the wall. By varying the seeding of the particles, it was determined that only particles underneath and toward the outer edge of the disk are resuspended.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 5

Resuspended particle sequence taken during downward stomping motion. Foot motion is toward the reader and the view is from below: (a) T=4.10, ZID=0.0007(Z=Zf), (b) T=4.52, ZID=0.0007(Z=Zf), (c) T=4.92, ZID=0.0007(Z=Zf), and (d) T=Tfinal, ZID=0.0007(Z=Zf)

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Figure 4

Resuspended particles during (a) downward stomping and (b) walking motion

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Figure 3

Flow visualization of particles resuspended during the downward stomping motion. Particles are originally seeded beneath the disk only.

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Figure 2

Velocity time histories of an actual foot stomping and the idealized stomping motions

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Figure 1

Experimental setup

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Figure 6

Bottom view of particles trajectories for different seeding patterns at T=Tfinal: (a) same diameter as a disk, (b) half diameter of disk beneath the disk, (c) ring shape beneath the disk, and (d) ring shape immediately outside the disk

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Figure 7

A sequence of flow-field velocity measurements taken during the downward stomping motion: (a) T=3.52, ZID=0.024(Z=3.7 mm) immediately before the foot stopped, (b) T=4.31, ZID=0.0007(Z=Zf), and (c) T=4.92, ZID=0.0007(Z=Zf)

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Figure 8

Flow-field velocity measurements taken during the downward walking motion (a) T=2.02, ZID=0.034 and (b) T=2.07, ZID=0.006(Z=0.9 mm)

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Figure 9

A sequence of velocity flow-field measurements taken during the upward portion of the stomping motion: (a) T=0.85, ZID=0.256, (b) T=1.13, ZID=0.455, and (c) T=1.70, ZID=0.994

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Figure 10

Visualization of particles resuspended during the upward stomping motion: (a) T=1.13, ZID=0.455, (b) T=1.89, ZID=1.17, and (c) T=3.02, ZID=1.86

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