Measurements of Droplet Vaporization in Sprays

Abstract

AASERT funding was used to support graduate student research in the area of spray droplet vaporization. Droplet lasing spectroscopy (DLS) was applied to the measurement of droplet size and vaporization rates in both reacting and non-reacting rectilinear droplet streams. Ethanol, methanol and a pentane/ethanol mixture were doped with Rhodamine 6G. Lasing spectra were examined in the steady state combustion regime. In the pentane/ethanol case, measurements were carried out in a sooting region of the flame. In some cases, vaporization rates were high enough to measure the rate from consecutive droplets, yielding a quasi-instantaneous measurement. In all cases, the D2 law of droplet vaporization was evident. In addition, photographs of the flames yielded measurements of flame height and thickness. In the final year of support, a triggering and timing system was developed so that the DLS method could be applied a turbulent flow in which the trajectory and location of the tagged, fluorescent droplets was uncertain.

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Document Details

Document Type
Technical Report
Publication Date
Sep 12, 2000
Accession Number
ADA383199

Entities

People

  • Ian M. Kennedy

Organizations

  • University of California

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Alcohols
  • Burning Rate
  • Charge Coupled Devices
  • Combustion
  • Flow
  • Generators
  • Images
  • Laser Dyes
  • Lasers
  • Measurement
  • Methanols
  • Research Facilities
  • Spectra
  • Spectroscopy
  • Steady State
  • Vaporization
  • Yag Lasers

Readers

  • Combustion science or combustion engineering.
  • Fluid Mechanics and Fluid Dynamics.
  • Optical Physics and Photonics.