Numerical Investigation of Powder Aerosolization in a Mining Rock Dust Dispersion Chamber

Details

• Personal Author:
  Chen H ; Ghia U ; Jog MA ; Turkevich LA
• Description:
  We have conducted numerical simulations of dust dispersion within the NIOSH Rock Dust Dispersion Chamber. The apparatus consists of a low-speed background ventilation flow down a long box in which is placed a tray containing a rock dust powder. A nozzle upstream of the tray introduces a short pulse of a turbulent horizontal jet flow just above the powder surface. We have utilized an incompressible Reynolds-Averaged Navier-Stokes k-w model for the turbulent flow; particles are incorporated within a one-way Euler-Lagrangian formalism. The Rock Dust Dispersion Chamber ventilation flow exhibits a recirculation zone just above the powder-containing tray. Aerosolization proceeds via the interplay of the jet pulse flow with the background recirculation flow. The air flow is not well-mixed. The aerosolized dust is convected as a concentration cloud downstream towards the detection zone. For larger particles, gravitational settling depletes the convected cloud, so the instrument be haves as a horizontal elutriator. The instrument is robust with respect to misalignment of the jet nozzle. However, reduced streamwise drift velocity allows mixing to disperse the optically detected dust cloud concentration pulse. Our large particle simulation results compare favorably with published experimental results for large, polydisperse calcium carbonate rock dust. [Description provided by NIOSH]
• Subjects:
  Aerosols Dust Mining Occupational Health Particulate Matter Safety Ventilation
• Keywords:
  Author Keywords: Dust Dispersion Dustiness Dusts Euler-Lagrangian Multiphase Explosion Prevention Models Particulates RANS K-w Turbulence Rock Mechanics
• ISSN:
  0950-4230
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DFSE - Division of Field Studies and Engineering
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  83
• NIOSHTIC Number:
  nn:20067664
• Citation:
  J Loss Prev Process Ind 2023 Jul; 83:105050
• Contact Point Address:
  Leonid A. Turkevich, Division of Field Studies & Engineering (DFSE), (NIOSH), The Centers for Disease Control & Prevention (CDC), Alice Hamilton Laboratory, 1090 Tusculum Avenue, Cincinnati, OH, 45226
• Email:
  LLT0@cdc.gov
• Federal Fiscal Year:
  2023
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Loss Prevention in the Process Industries
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:923cd6994e84c10d7ea25fa92bf7f9683ddc1aedc80af1b46624dbd8d45dc84ed38ed01c25aca43d9f469263964d3023c9b1bd4495c5483f8390c2121cca9426
• Download URL:
  https://stacks.cdc.gov/view/cdc/229933/cdc_229933_DS1.pdf
• File Type:
  [PDF - 16.12 MB ]