Investigation of differential diffusion in turbulent jet flows using planar laser Rayleigh scattering

Dibble, Robert W.; Long, Marshall B.

doi:10.1016/j.combustflame.2005.08.029

Cited by 26 publications

(5 citation statements)

References 25 publications

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“…Similarly, multi-scalar imaging measurements of mixture fraction, temperature and reaction rates in reacting flows [10,11] do not directly address the underlying multispecies molecular mixing. Previous work in three-species turbulent mixing has measured normalized scalar differences [12][13][14], but without explicit measurement of individual mole fractions.…”

Section: Introductionmentioning

confidence: 99%

Measurements of multiple mole fraction fields in a turbulent jet by simultaneous planar laser-induced fluorescence and planar Rayleigh scattering

Brownell

2011

Meas. Sci. Technol.

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This paper presents two-dimensional measurements of all individual mole fractions in a three-species, non-reacting turbulent flow, using planar laser-induced fluorescence (PLIF) and planar laser Rayleigh scattering. The flow is an axisymmetric jet of acetone and helium in an air coflow. PLIF measures the acetone mole fraction, while Rayleigh scattering measures a linear combination of the acetone and helium mole fractions. The simultaneous implementation of these techniques allows for the calculation of the helium and air mole fraction fields. The results of this diagnostic method are being used for the study of multicomponent molecular transport effects in turbulent fluid mixing.

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Section: Introductionmentioning

confidence: 99%

Measurements of multiple mole fraction fields in a turbulent jet by simultaneous planar laser-induced fluorescence and planar Rayleigh scattering

Brownell

2011

Meas. Sci. Technol.

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“…Furthermore, these studies can be relatively easily conducted in the absence of inertial effects (owing to the increased density of liquids as compared to gases), facilitating the isolation of differential diffusion effects. Dibble & Long (2005) reported on a non-reacting gas-phase study, proposed by Bilger & Dibble (1982) and conducted in 1989. Differential diffusion effects were observed in jets containing mixtures of Freon and hydrogen for Reynolds numbers up to 20 000.…”

Section: Introductionmentioning

confidence: 99%

Differential diffusion of high-Schmidt-number passive scalars in a turbulent jet

2008

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The separate evolution, or differential diffusion, of high-Schmidt-number passive scalars in a turbulent jet is studied experimentally. The two scalars under consideration are disodium fluorescein (Sc≡ ν/D= 2000) and sulforhodamine 101 (Sc= 5000). The objectives of the research are twofold: to determine (i) the Reynolds-number-dependence, and (ii) the radial distribution of differential diffusion effects in the self-similar region of the jet. Punctual laser-induced fluorescence (LIF) measurements were obtained 50 jet diameters downstream of the nozzle exit for five Reynolds numbers (Re≡uod/ν = 900, 2100, 4300, 6700 and 10600, whereu0is the jet exit velocity,dis the jet diameter, and ν is the kinematic viscosity) and for radial positions extending from the centreline to the edges of the jet cross-section (0 ≤r/d≤ 7.5). Statistics of the normalized concentration difference,Z, were used to quantify the differential diffusion. The latter were found to decay slowly with increasing Reynolds number, with the root mean square ofZscaling asZrms≡ 〈Z2〉1/2∝Re−0.1, (or alternatively 〈Z2〉 ∝Re−0.2). Regardless of Reynolds number, differential diffusion effects were found to increase away from the centreline. The increase in differential diffusion effects with radial position, along with their increase with decreasing Reynolds number, support the hypothesis of increased differential diffusion at interfaces between the jet and ambient fluids. Power spectral densities ofZwere also studied. These spectra decreased with increasing wavenumber – an observation attributed to the decay of the scalar fluctuations in a turbulent jet. Furthermore, these spectra showed that significant differential diffusion effects persist at scales larger than the Kolmogorov scale, even for moderately high Reynolds numbers.

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“…In particular, LEM takes into account effects of differential diffusion, which plays an important role in hydrogen combustion [21,22]. A full description of the onedimensional LEM can be found in [1,2].…”

Section: Linear Eddy Modelingmentioning

confidence: 99%

Three-dimensional Linear Eddy Modeling of a Turbulent Lifted Hydrogen Jet Flame in a Vitiated Co-flow

Grøvdal

Sannan

Chen

et al. 2018

Flow Turbulence Combust

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A new methodology for modeling and simulation of reactive flows is reported in which a 3D formulation of the Linear Eddy Model (LEM3D) is used as a post-processing tool for an initial RANS simulation. In this hybrid approach, LEM3D complements RANS with unsteadiness and small-scale resolution in a computationally efficient manner. To demonstrate the RANS-LEM3D model, the hybrid model is applied to a lifted turbulent N 2 -diluted hydrogen jet flame in a vitiated co-flow of hot products from lean H 2 /air combustion. In the present modeling approach, mean-flow information from RANS provides model input to LEM3D, which returns the scalar statistics needed for more accurate mixing and reaction calculations. Flame lift-off heights and flame structure are investigated

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Investigation of differential diffusion in turbulent jet flows using planar laser Rayleigh scattering

Cited by 26 publications

References 25 publications

Measurements of multiple mole fraction fields in a turbulent jet by simultaneous planar laser-induced fluorescence and planar Rayleigh scattering

Measurements of multiple mole fraction fields in a turbulent jet by simultaneous planar laser-induced fluorescence and planar Rayleigh scattering

Differential diffusion of high-Schmidt-number passive scalars in a turbulent jet

Three-dimensional Linear Eddy Modeling of a Turbulent Lifted Hydrogen Jet Flame in a Vitiated Co-flow

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