Effects of Particle Size and Density on Dust Dispersion Behind a Moving Shock

Details

• Personal Author:
  Houim RW ; Lai S ; Oran ES
• Description:
  Numerical simulations are performed to study the effect of particle size and density on dust dispersion behind a moving shock. The numerical model used in this paper takes into account multiple particle types with a binning approach, and each bin of particles has its own characteristic uniform particle size and density. The model solves one set of governing equations for the gas phase and M sets of governing equations for the M particle types. Equations for each bin of particles are coupled with the gas flow as well as all other particle types. The specific conditions simulate a Mach-1.4 shock passing over a dust layer containing two uniformly mixed particle types. The background gas condition is at 67 kPa and 295 K. The dust layer is 1.27 cm thick and consists of spherical particles with selected sizes and densities. Preliminary one-dimensional computations of a shock passing through a dilute particle curtain containing different particle types suggest that particles with different sizes or densities behave differently and can separate into different clouds. Particles with larger inertia require a longer relaxation time to the postshock condition. The two-dimensional calculations show that larger particles are lifted to a higher level than smaller particles. In regions near the shock front, larger particles experience a smaller drag force, pushing the particles into the dust layer, and a larger lifting force, pulling the particles into the air. In addition, lighter particles are lifted higher than heavier particles due to a smaller inertia. Particle size plays a significant role on dust dispersion, while particle density has only a minor effect. [Description provided by NIOSH]
• Subjects:
  Occupational Health Particulate Matter Safety
• Keywords:
  Analytical Models Dispersion Explosive Dusts Particle Aerodynamics Particle Size Shock Waves
• ISSN:
  2469-990X
• Document Type:
  Text
• Funding:
  Contract
• Genre:
  Journal Article
• Place as Subject:
  Florida ; Maryland ; OSHA Region 3 ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  3
• Issue:
  6
• NIOSHTIC Number:
  nn:20068860
• Citation:
  Phys Rev Fluids 2018 Jun; 3(6):064306
• Federal Fiscal Year:
  2018
• Performing Organization:
  University of Maryland
• Peer Reviewed:
  True
• Start Date:
  20150901
• Source Full Name:
  Physical Review Fluids
• End Date:
  20180831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:99f2b827b9bce8d4e78f90bbd4291109929b597698b50a11b3ada463234e1009e9aaafb41c0a99055c9a9b6e9af5a08eedddc001c29e9ff4c17ece0fdace8622
• Download URL:
  https://stacks.cdc.gov/view/cdc/207428/cdc_207428_DS1.pdf
• File Type:
  [PDF - 4.00 MB ]