Structure of sprays generated by unlike doublet injectors

McDonell, Vince; Phi, V. M.; Samuelsen, Scott; Nejad, A.; Shahnam, Mehrdad; Guernsey, Carl S.; Carlson, R.

doi:10.2514/6.1999-2464

Cited by 2 publications

(1 citation statement)

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“…Conventional methods such as mechanical patternators [9,10] are ineffective in regions where the jets have not fully broken up into droplets, and laser-induced fluorescence [11][12][13] and attenuation techniques [2] suffer from complex refraction patterns at the highly deformed phase interfaces that develop near the impingement point. As such, these measurements have been employed below the point of impingement where gas initiation and/or chemical reactions would originate, and the extent to which these early reactions might occur and alter the downstream spray development is not well understood.…”

Section: Introductionmentioning

confidence: 99%

Quantitative measurement of binary liquid distributions using multiple-tracer x-ray fluorescence and radiography

Halls¹,

Meyer²,

Kastengren³

2015

Opt. Express

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The complex geometry and large index-of-refraction gradients that occur near the point of impingement of binary liquid jets present a challenging environment for optical interrogation. A simultaneous quadrupletracer x-ray fluorescence and line-of-sight radiography technique is proposed as a means of distinguishing and quantifying individual liquid component distributions prior to, during, and after jet impact. Two different pairs of fluorescence tracers are seeded into each liquid stream to maximize their attenuation ratio for reabsorption correction and differentiation of the two fluids during mixing. This approach for instantaneous correction of xray fluorescence reabsorption is compared with a more time-intensive approach of using stereographic reconstruction of x-ray attenuation along multiple lines of sight. The proposed methodology addresses the need for a quantitative measurement technique capable of interrogating optically complex, nearfield liquid distributions in many mixing systems of practical interest involving two or more liquid streams. RightsThis paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be be found at the following URL on the OSA website: https://www.osapublishing.org/search.cfm?q=&j=oe&v=23&i=2&p=1730. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means in prohibited and is subject to penalties under law. Abstract:The complex geometry and large index-of-refraction gradients that occur near the point of impingement of binary liquid jets present a challenging environment for optical interrogation. A simultaneous quadruple-tracer x-ray fluorescence and line-of-sight radiography technique is proposed as a means of distinguishing and quantifying individual liquid component distributions prior to, during, and after jet impact. Two different pairs of fluorescence tracers are seeded into each liquid stream to maximize their attenuation ratio for reabsorption correction and differentiation of the two fluids during mixing. This approach for instantaneous correction of xray fluorescence reabsorption is compared with a more time-intensive approach of using stereographic reconstruction of x-ray attenuation along multiple lines of sight. The proposed methodology addresses the need for a quantitative measurement technique capable of interrogating optically complex, near-field liquid distributions in many mixing systems of practical interest involving two or more liquid streams.

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