Title page for ETD etd-02072012-101235

Type of Document Dissertation
Author LePera, Stephen D
Author's Email Address stephen.lepera@gmail.com
URN etd-02072012-101235
Title Development of a Novel Planar Mie Scattering Method for Measurement of Spray Characteristics
Degree PhD
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Vandsburger, Uri Committee Chair
Cohen, Jeffrey Committee Member
Ekkad, Srinath V. Committee Member
Ng, Fai Committee Member
O'Brien, Walter F. Jr. Committee Member
  • Mie
  • Scattering
  • Optical
  • Planar
  • Measurement
  • Diagnostic
  • Laser
  • Image
  • Spray
  • Droplet
  • Particle
Date of Defense 2012-02-03
Availability unrestricted
The work herein details an optical droplet measurement system based on planar multi-angle

Mie scattering. Sizing information consists of a mean droplet diameter and droplet

distribution estimates for every individual point within a planar (2D) area of interest. The

planar method makes possible the fast acquisition of data within a large field of interest, and

uses relatively inexpensive instrumentation.

As presented, the method demonstrated the ability to measure water droplets from a typical

simplex spray nozzle, across the range of 5-50 micrometers within +/-10% of known values, and in

addition return an estimate of the shape and width of the size distribution at each location

within the planar region of interest. Measurements demonstrating the agreement between

results from this current method and known PDA data were successfully completed for a

1-gallon-per-hour spray nozzle, and repeatability was demonstrated in 2.5-gallon-per-hour

and 4.5-gallon-per-hour nozzles.

Additionally the limits of the technique are explored with simulated data. Conclusions from

these exercises show that the multi-angle planar Mie scattering method is capable of measuring

droplet distribution characteristics and means within a nominal range of 0.3 micrometers up to 150 micrometers.

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