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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013008310
pages 81-96

EFFECT OF THE LIQUID INJECTION ANGLE ON THE ATOMIZATION OF LIQUID JETS IN SUBSONIC CROSSFLOWS

H. Almeida
Mechanical Engineering Department, Instituto Superior Tecnico, University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
J. M. M. Sousa
Mechanical Engineering Department, Instituto Superior Tecnico, University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal
Mário Costa
IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal

SINOPSIS

This work is focused on the study of sprays produced by pressure atomizers of single-hole type when subjected to air crossflows at atmospheric pressure. The study was carried out in a wind tunnel. Prior to spray characterization, the airflow inside the wind tunnel was evaluated with the aid of laser Doppler anemometry. The sprays were first characterized using a shadowgraphy technique, which allowed for a qualitative evaluation of the overall quality of the atomization. Subsequently, the use of phase Doppler anemometry allowed performing detailed measurements of the spray droplet diameters and velocities, as a function of the injection angle, for various nondimensional atomizer distances. The main findings of this study are as follows: (i) The liquid column disintegration process is significantly affected by the liquid injection angle and, less considerably, by the liquid-to-air momentum flux ratio; (ii) the Sauter mean diameter decreases noticeably as the injection angle of the liquid increases; and (iii) the characteristics of droplet diameter and velocity distributions vary significantly as the distance to the injector increases.


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