RANS VOF Simulations of Density-Stratified Air-Water Flow in a 2D Channel

Details

• Personal Author:
  Ghia U ; Maiti CJ ; Turkevich LA
• Description:
  We perform RANS-VOF simulation of density-stratified, fully developed air-water flow in a 2D channel. The flow is completely specified by the (common) driving pressure gradient down the channel and by the fill factor (relative height of the heavier phase to the total height of the channel). Varying the pressure gradient and fill factor results in different flow combinations: namely, laminar air/laminar water, turbulent air/laminar water, turbulent air/turbulent water, laminar air/turbulent water. The focus of the study is the near-interface interaction when either or both phases are turbulent. The RANS-VOF equations are solved on a 2D channel with periodic inlet/outlet boundary conditions. For a fixed fill factor, the Reynolds numbers of each phase varies monotonically with driving pressure gradient. However, at fixed pressure gradient, the fluid Reynolds numbers are non-monotonic at high fill factor. This Reynolds number phase diagram is important in understanding the laminar and turbulent regimes of each phase. The mean velocity is axial (down the channel) and exhibits a dip below the free surface whenever one of the phases is turbulent. As expected, the diagonal Reynolds stresses , , are strongly coupled between the phases, however coupling in is less pronounced. [Description provided by NIOSH]
• Subjects:
  Air Movements Body Height Occupational Health Safety
• Keywords:
  Air Flow Fluid Mechanics Fluids Heat Exchange Height Factors Hydraulic Fluids Models Pressure Gradients Water Analysis Water Supply
• ISBN:
  9780791883716
• ISSN:
  0888-8116
• Publisher:
  The American Society of Mechanical Engineers
• 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:20061457
• Citation:
  ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels, July 13-15, 2020, virtual event. New York: The American Society of Mechanical Engineers, paper no. FEDSM2020-20338, 2020 Nov; 1:V001T01A020
• Contact Point Address:
  Chandrima Jana Maiti, Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, USA
• Email:
  janaca@mail.uc.edu
• Federal Fiscal Year:
  2021
• NORA Priority Area:
  Manufacturing
• Peer Reviewed:
  False
• Source Full Name:
  ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels, July 13-15, 2020, virtual event
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:002a7a925f970dd13327bd816be30f6a2d6e969095b163cdcc7550be1394ba9ea7ead4f94e914570615f4d5de185820fb2584dfc80f16397ee9111843a191369
• Download URL:
  https://stacks.cdc.gov/view/cdc/224987/cdc_224987_DS1.pdf
• File Type:
  [PDF - 1.60 MB ]