Dust Resuspension from the Splash of a Falling Powder: A Numerical Aerodynamic Simulation of a Pellet Falling onto a Powder Monolayer

Details

• Personal Author:
  Chen H ; Jog MA ; Turkevich LA
• Description:
  A falling powder can generate a dust cloud from its interaction with the ambient air and from its splash onto a substrate. This article reports the results of a numerical simulation study, which attempts to model this second process. We argue that the dust cloud arises from the aerodynamic resuspension of previously deposited small particles. The agglomerated falling powder is modeled as a falling pellet disk impacting a surface covered with a monolayer of previously deposited particles. The Reynolds number of the air flow in the vicinity of the impacting pellet is Re approximately 1860, so the air flow is modeled as laminar and incompressible. The dust particles are incorporated via a Lagrangian multiphase treatment. The sudden deceleration of the disk sheds an aerodynamic vortex, which suspends particles from the monolayer. Characteristics of the dust cloud (average and maximum height and radius) are tracked; these are conveniently summarized by following the trajectory of the dust cloud centroid. The probability of aerosolization decreases with distance from the impacted pellet. The centroid trajectory is studied as a function of dust particle size. The model is relatively insensitive to disk radius and thickness. More realistic modeling of dust clouds generated by the splash of falling powders will require a statistical analysis of aggregate size and location, as well as the inclusion of interparticle and particle-surface interactions. [Description provided by NIOSH]
• Subjects:
  Aerosols Dust Occupational Health Particulate Matter Safety
• Keywords:
  Aerosol Particles Dust Particles Dusts Particle Aerodynamics Particle Size Particulate Dust
• ISSN:
  0278-6826
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Chicago Region [OSHA] ; Ohio
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DFSE - Division of Field Studies and Engineering
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  49-65
• Volume:
  59
• Issue:
  1
• NIOSHTIC Number:
  nn:20070286
• Citation:
  Aerosol Sci Technol 2025 Jan; 59(1):49-65
• Contact Point Address:
  Leonid A. Turkevich, Division of Field Studies & Engineering (DFSE), National Institute for Occupational Safety & Health (NIOSH), The Centers for Disease Control & Prevention (CDC), Alice Hamilton Laboratory, Cincinnati, Ohio
• Email:
  LLT0@cdc.gov
• Federal Fiscal Year:
  2025
• Peer Reviewed:
  True
• Source Full Name:
  Aerosol Science and Technology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7e49f1fb72e54128a6a52416a4b6d93a8a1ac79ec7bf4d46c647c6608689e8d6fef4693529b91b5eeab331c4873f52bfb245170d0d8f0cdb735a6f6a6a5d0a5c
• Download URL:
  https://stacks.cdc.gov/view/cdc/208532/cdc_208532_DS1.pdf
• File Type:
  [PDF - 2.50 MB ]