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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

1993, Volume3

134 pages

Issue price - $75.00

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

Vincent G. McDonell
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California, USA

M. Adachi
UCI Combustion Laboratory, University of California, Irvine, California 92717

G. S. Samuelsen
UCI Combustion Laboratory, University of California, Irvine, California 92717

ABSTRACT

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.