Effect of Vortex Shedding on the Aerosolization of a Particle from a Hill Using Large Eddy Simulation

Details

• Personal Author:
  Ghia U ; Sharma A ; Turkevich L
• Description:
  Motivated by recent experiments on the dustiness of nanoscale powders, this research reports on a numerical study of powder aerosolization inside the Venturi Dustiness Tester (VDT). In particular, we study the effect of vortex shedding on the aerosolization of a test particle from a powder hill at Reynolds number of 20,000 in the powder holding device attached to VDT. The powder holding tube is represented as a cylindrical tube with a hemispherical (powder) hill situated within. A test particle is positioned at various locations on the hill. We study the flow behavior past the hemispherical obstruction in the tube and its influence on the aerodynamic forces experienced by a test particle located at various positions on the obstruction. The frequency of the vortex shedding from the bump yields a Strouhal number St = 0.2. The peak frequency associated with the particle positioned at the top of the bump is comparable to that associated with the bump alone. We calculate the time-dependent drag, lift, and moment on the test particle, each of which is strongly influenced by the vortex shedding from the hill. The mean values of drag, lift, and moment on the test particle characterize its aerosolization. [Description provided by NIOSH]
• Subjects:
  Aerosols Air Pollutants, Occupational Behavior Dust Laboratories Occupational Health Particulate Matter Safety
• Keywords:
  Airborne Dusts Aviation Dusts Laboratory Testing Nanoparticles Nanoscale Nanotechnology Particulates Testing Equipment
• ISBN:
  9781624105982
• Publisher:
  American Institute of Aeronautics and Astronautics, Inc.
• Document Type:
  Text
• Genre:
  Proceedings
• 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:
  1
• NIOSHTIC Number:
  nn:20061285
• Citation:
  AIAA Aviation 2020 Forum, June 15-19, 2020, Virtual Event. Reston,VA: American Institute of Aeronautics and Astronautics, Inc., 2020 Jun; 1(Pt F):2020-2988
• Federal Fiscal Year:
  2020
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  False
• Part Number:
  F
• Source Full Name:
  AIAA Aviation 2020 Forum, June 15-19, 2020, Virtual Event
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2a488c1f041283fa1e789168762bb998cd4690dc1dc5bc579a9452faa15aeb812a239b2e76aafdf835ed5673b2ee8d3465071c731203f12efde4e3090855c46c
• Download URL:
  https://stacks.cdc.gov/view/cdc/224859/cdc_224859_DS1.pdf
• File Type:
  [PDF - 1.55 MB ]