Lagrangian dynamics of turbulent Rayleigh-Benard convection
Shen, Shikun
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https://hdl.handle.net/2142/105098
Description
Title
Lagrangian dynamics of turbulent Rayleigh-Benard convection
Author(s)
Shen, Shikun
Issue Date
2019-04-25
Director of Research (if dissertation) or Advisor (if thesis)
Chamorro, Leonardo P.
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Lagrangian
PTV
Rayleigh Benard convection
Abstract
This thesis focuses on laboratory experiments of turbulent Rayleigh Benard convection. Emphasis is placed on describing the Lagrangian dynamics of thermally-strati ed flows at Rayleigh numbers Ra = 2.8*10^9 and 1.1*10^10 for aspect ratios of 1.2, and 2. For this purpose, three-dimensional particle tracking velocimetry (3D-PTV) was used to characterize the three-dimensional Lagrangian paths of tracer particles in RB. The work also provides a general methodology for data pre-processing along with flow data post-processing. Lagrangian statistics including velocity and acceleration possibility density functions as well as pair dispersion are explored in detail. Inspection of the dynamics of buoyant particles, namely bubbles, are also discussed.
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