Density measurements from crossed beams at high extinction

Johnson, J. A.; Ramaiah, Raghu; Santiago, J.

doi:10.1063/1.1136694

Cited by 4 publications

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“…This configuration was also used to obtain instantaneous point measurements of density fluctuations using the crossed beam technique. 10 In an alternate configuration, the 488.0 nm blue line from a Spectra Physics model 170-19 argon ion laser was passed through the test section at both stations. The yellow fluorescence induced by resonant absorption was monitored at a right angle to the laser beam; in this case several points were monitored-two separated by 4 mm along the axis of the shock tube and two separated by 4 mm perpendicular to the shock tube's axis.…”

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Turbulence in a reacting contact surface

Johnson

1990

Physics of Fluids A: Fluid Dynamics

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Radiation damageinduced changes in silicon nitride membrane mechanical properties J. Vac. Sci. Technol. B 13, 3075 (1995); 10.1116/1.588325 Distortion analysis of stencil masks with stressrelief structures Turbulent features in a shock tube's contact surface with 2N0 2 ( = ) N2 0 4 are explored. Turbulent densities and velocities show an overall power-law dependence in the fluctuation spectra. At fixed reactant percentages, turbulence increases with increasing Reynolds number. At fixed Reynolds numbers, increasing the reactant percentages causes a reduction in turbulence and an increase in the relative strength of discrete high-frequency components in the density fluctuation spectra. The reliability of conventional chemical modeling for this system apparently decreases with increasing turbulence in a manner suggestive of reaction rate distortion, consistent with theoretical speculation.

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confidence: 99%