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Primary Breakup of Nonturbulent Round Liquid Jets in Gaseous Crossflows

Wednesday, October 20, 2004
4:00–5:00 PM
Davidson 3
 
Professor G. M. Faeth
Department of Aerospace Engineering, The University of Michigan

The deformation and primary breakup properties of nonturbulent round liquid jets in gaseous crossflows were studied experimentally, motivated by applications to spray breakup in air-breathing aircraft propulsion systems, liquid rocket engines, diesel engines, spark-ignition engines and agricultural sprays, among others. The objective was to exploit the capabilities of pulsed holography to penetrate the near-injector dense spray region and allow observations of the mechanism and outcome of primary liquid breakup at the surface of the liquid jet . The experiments provided observations of primary breakup regimes and their transitions, the conditions required for the onset of ligament and drop formation at the liquid jet surface, ligament and drop sizes along the liquid jet surface, drop velocities after breakup, conditions required for breakup of the liquid jet as a whole, rates of liquid breakup along the liquid jet surface between the onset of drop formation and breakup of the liquid jet as a whole, and the trajectories of the liquid jets in gaseous crossflows. The results suggest qualitative similarities between the primary breakup of nonturbulent round liquid jets in gaseous crossflows and the secondary breakup of drops subjected to shock wave disturbances in gases. Phenomenological analyses were effective to help interpret the observations and to correlate the easurements for use by others. These results provide all the spray property initial conditions needed to carry out numerical simulations of the dilute spray region of these injectors.

Brief Vita of G.M. Faeth:

Dr. Faeth is Arthur B. Modine Distinguished University Professor of Aerospace Engineering, Professor of Mechanical Engineering and Head of the Gas Dynamics Laboratories at The University of Michigan, and Professor Emeritus of Mechanical Engineering at The Pennsylvania State University. He is past Editor-in-Chief of the AIAA Journal(1997-2002), a journal of the American Institute of Aeronautics and Astronautics (AIAA); past Technical Editor of Combustion and Flame (1990-1996), a journal of the Combustion Institute; and past Technical Editor of the Journal of Heat Transfer (1985-1989), a journal of the American Society of Mechanical Engineers (ASME). He is a Fellow of AIAA, ASME, the American Association for the Advancement of Science (AAAS) and the American Physical Society (APS); and he also is a Member and a National Associate of the National Academy of Engineering. He received the Heat Transfer Memorial Award (1988) from ASME; the Propellants and Combustion (1993) and the Space Processing (2004) Awards from AIAA; the Alfred C. Egerton Gold Medal from the Combustion Institute (2004); the Public Service Medal (1999) from NASA; and the Highly-Cited Researcher Certificate (2000), as one of the 99 most frequently cited engineers in the world, from the Institute of Scientific Information. He is author or co-author of more than five hundred articles and papers.