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Atomization and Sprays

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

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2011003661
pages 375-390

MASS DISTRIBUTION STUDIES IN EFFERVESCENT SPRAYS

Hrishikesh P. Gadgil
Department of Aerospace Engineering, Indian Institute of Science, Bangalore, 560012, India
Ali Dolatabadi
Department of Mechanical and Industrial Engineering, Concordia University, Montreal, H3G 1M8, Canada
B. N. Raghunandan
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India

ABSTRACT

An experimental study on liquid mass distribution in effervescent sprays using water and air as working fluids is presented in this paper. Optical patternation and techniques of image processing are employed for analyzing the spray. The flow regime inside the effervescent atomizer largely dictates the mass distribution patterns. The patterns are seen to vary from concentrated, poorly atomized liquid lumps to uniformly distributed, fine droplets as the flow regime changes from bubbly flow to annular flow. A large variety of instantaneous spray patterns are observed in bubbly flow regime indicating a highly unsteady atomization process. However, relatively better consistency in spray patterns is observed at higher gas flow rates. Thus, the degree of unsteadiness gradually diminishes as gas flow rate is increased. The axial evolution of the spray in annular mode shows good mixing of liquid and gas across the interface.