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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v3.i4.40
pages 411-436

STRUCTURE OF REACTING AND NONREACTING, NONSWIRLING, AIR-ASSISTED SPRAYS, PART II: DROP BEHAVIOR

Vincent McDonell
Department of Mechanical and Aerospace Engineering, University of California at Irvine, USA
M. Adachi
UCI Combustion Laboratory, University of California, Irvine, California 92717
G. Scott Samuelsen
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California 92697-3550, USA

ABSTRAKT

This is the second part of a study that examines the structure of a nonswirling, air-assisted methanol spray operating under reacting and nonreacting conditions. This article examines the behavior of the droplets, while the first part focused on the behavior of Ae gas phase. Measurements of continuous-phase mean and fluctuating velocities, dispersed-phase size and velocity distributions, and local dispersed-phase volume flux are obtained using phase Doppler interferometry. The measurements of the drops show that the structure is consistent with those from the gas phase, namely, that two regions exist in the reacting spray: (1) a relatively cool central region that features high vapor concentrations and droplet behavior, which corresponds closely to the droplet behavior in the nonreacting case, and (2) a surrounding high-temperature reaction zone in which vapor is consumed and in which sharp differences between the reacting and nonreacting droplet behavior is observed. The results also indicate that evaporation, rather than differences in the trajectories of droplets between the reacting and nonreacting cases, is the primary reason for observed decreases in droplet distribution volume mean diameter and volume flux and increases in measured velocities of a given drop size at a given location. Further, it is observed that local clusters of drops occur throughout the spray for both the reacting and nonreacting conditions. The results also indicate the importance of considering the variations in time and length scales for each drop size.


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