Phase Doppler Interferometry with Probe-to-Droplet Size Ratios Less Than Unity. Part I: Trajectory Errors
Abstract
Phase Doppler interferomety utilizing a probe volume much smaller than the droplets being measured has been shown to work well when coupled with a phase ratio and intensity validation scheme which is capable of eliminating trajectory dependent scattering errors. Ray-tracing and geometric optics models were used to quantitatively demonstrate the type and magnitude of trajectory errors through stochastic trajectory calculations. Measurements with mono-dispersed water droplet streams and glass beads have been performed to validate the model calculations. Measurements with mono-dispersed water droplet streams and glass beads have been performed to validate the model calculations and to characterize the probe volume. Scattered light intensity has also been shown to provide a robust means of determining the probe cross-sectional area which is critical for making accurate mass flux measurements.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 16, 1999
- Accession Number
- ADA409371
Entities
People
- Douglas G. Talley
- P. A. Strakey
- S. V. Sankar
- W. D. Bachalo
Organizations
- Air Force Research Laboratory