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
Date of Ingest
2019-08-23T20:36:12Z
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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