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Atomization and Sprays

Impact factor: 1.235

ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2016013961
pages 1337-1359

TEMPERATURE CHARACTERISTICS IN A FLASH ATOMIZATION PROCESS

Astrid Guenther
Institute of Particle Technology, Friedrich-Alexander-Universitat Erlangen-Nurnberg, D-91058 Erlangen, Germany
Andreas Braeuer
Lehrstuhl fur Technische Thermodynamik, Friedrich-Alexander-Universitat Erlangen-Nurnberg, D-91058 Erlangen, Germany
Philipp Siegler
Lehrstuhl fur Technische Thermodynamik, Friedrich-Alexander-Universitat Erlangen-Nurnberg, D-91058 Erlangen, Germany; Erlangen Graduate School in Advanced Optical Technologies, Friedrich-Alexander-Universitat Erlangen-Nurnberg, D-91058 Erlangen, Germany
Benedikt Kninger
Institute of Particle Technology, Friedrich-Alexander-Universitat Erlangen-Nurnberg, D-91058 Erlangen, Germany
Karl-Ernst Wirth
Institute of Particle Technology, Friedrich-Alexander-Universitat Erlangen-Nurnberg, D-91058 Erlangen, Germany

ABSTRACT

Superheated, or flash, atomization is a highly complicated process. Important factors characterizing the effectiveness of the spray breakup and the quality of the resulting spray are the mean droplet diameter and spray temperature. The smaller both quantities get, the more intense is the disintegration of the liquid. The determination of the spray liquid temperature is often conducted with thermocouples. This measurement method is disadvantageous owing to its invasive character that induces disturbances of the liquid flow. To improve the temperature measurement, linear Raman scattering is used. This laser-based, noninvasive measurement method allows the determination of the spray liquid phase without considering the gas phase. In this work, it is for the first time applied to characterize the development of liquid temperature in a spray generated by flash atomization. Shadowgraphy is used to assign the predominating break up mechanism to the corresponding spray temperature evolution. Furthermore, droplet diameters are measured with laser diffraction. The evaluation of linear Raman spectroscopy for the analysis of the spray temperature in combination with the description of spray characteristics are the outlines of the article. The results show that droplet temperatures can be determined with linear Raman scattering, yielding a lower spray temperature for higher applied superheat.