Turbulent molecular mixing in fully-developed planar shear flows

Terrence R. Meyer, J. Craig Dutton, Robert P. Lucht

Research output: Contribution to conferencePaperpeer-review

Abstract

Simultaneous NO and acetone planar laser-induced fluorescence is used to simulate a fast chemical reaction and provide the first instantaneous, resolution-independent images of molecularly-mixed fluid quantities in a fully-developed, gaseous planar shear layer. Velocity ratios ranging from 0.25 to 0.44 and two measurement locations are used to obtain values of Reδ = ΔUδ/ν ranging from 18,600 to 103,000 and values of the "pairing parameter" ranging from 6.9 to 28.1. A "flip" experiment is used to obtain the mixed low- and high-speed fluid probability density functions, ensemble-averaged statistics, overall mixing efficiencies, and entrainment ratios at each test condition. Significantly different mixing dynamics are observed between the low- and high-speed fluids which shed new light on the mechanisms that contribute to the preferred entrainment of high-speed fluid. Results further indicate that a pseudo self-similar state is achieved relatively early, with statistics that vary across the shear layer. A slow evolution occurs, however, in the mixed-fluid statistics at higher Reδ.

Original languageEnglish (US)
DOIs
StatePublished - 2001
Event39th Aerospace Sciences Meeting and Exhibit 2001 - Reno, NV, United States
Duration: Jan 8 2001Jan 11 2001

Other

Other39th Aerospace Sciences Meeting and Exhibit 2001
CountryUnited States
CityReno, NV
Period1/8/011/11/01

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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