Title page for ETD etd-12132006-032833


Type of Document Master's Thesis
Author Brady, Michael Richard
Author's Email Address
URN etd-12132006-032833
Title Subpixel Resolution Schemes for Multiphase Flows
Degree Master of Science
Department Engineering Science and Mechanics
Advisory Committee
Advisor Name Title
Vlachos, Pavlos P. Committee Chair
Telionis, Demetri P. Committee Member
Yoon, Roe-Hoan Committee Member
Keywords
  • Subpixel Resolution
  • Multiphase flows
  • Spray Dynamics
  • Particle Tracking Velocimetry
  • Particle Image Velocimetry
Date of Defense 2006-10-20
Availability unrestricted
Abstract
This effort explores novel sub-resolution particle center estimation algorithms for Digital Particle Tracking Velocimetry (DPIV). The errors of these new methods were classified through Monte-Carlo simulations. These schemes provide direct measurements of the apparent particle image diameter and the subpixel position. The new methods significantly reduce the bias error due to pixel discretization, thus reducing the total error in the position and sizing measurement compared to the classic three point and least squares Gaussian estimators. In addition, the accuracy of the least-squares fits were essentially independent of the true particle diameter and significantly reduced the particle position error compared with current estimation schemes. The results of the Monte Carlo simulations were validated in a high pressure spray atomization experiment.
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