Publicou 12 edições por ano
ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684
Indexed in
EXPERIMENTAL INVESTIGATION OF THE DROP SIZE DISTRIBUTION OF SPRAYS PRODUCED BY A LOWVELOCITY NEWTONIAN CYLINDRICAL LIQUID JET
RESUMO
The origin of the critical point of a cylindrical liquid jet, first maximum of the stability curve, is not fully understood so far. In a previous experimental investigation, three different jet regimes of atomization were defined according to the influence of the gas density on the jet critical velocity. Whether a jet is in a given regime was found to be a function of a parameter rG*, equivalent to a density. In the present investigation, the relevance of this parameter is considered and jet atomization processes are studied through the analysis of the evolution of the drop size distribution in the vicinity of the critical condition. A (rG*, Z) map is derived from the analysis of a large amount of experimental results found in the literature. This map is of practical interest, as it helps in presupposing the behavior of a liquid jet. The analysis of the drop size distribution reveals that the instability that develops when the critical velocity is reached may be a subcritical or a supercritical instability, according to the jet regime of atomization. When a subcritical instability develops, the disintegration process is controlled by capillary instability even for velocities greater than the critical velocity, and the breakup length varies according to the initial conditions. It was found that the development of such instabilities has no effect on the relative drop size distribution width, which seems therefore to be mainly a function of the perturbation growth process. When a supercritical instability develops, the development of the critical point is due to the action of the aerodynamic forces, which increases the temporal growth rate of the instability as the velocity increases.
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Dumouchel Christophe, Cousin Jean, Triballier Kaëlig, On the role of the liquid flow characteristics on low-Weber-number atomization processes, Experiments in Fluids, 38, 5, 2005. Crossref
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Dumouchel Christophe, Sindayihebura Daniel, Bolle Léon, Application of the Maximum Entropy Formalism on Sprays Produced by Ultrasonic Atomizers, Particle & Particle Systems Characterization, 20, 2, 2003. Crossref
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Lecompte Matthieu, Dumouchel Christophe, On the Capability of the Generalized Gamma Function to Represent Spray Drop-Size Distribution, Particle & Particle Systems Characterization, 25, 2, 2008. Crossref
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Dumouchel Christophe, On the experimental investigation on primary atomization of liquid streams, Experiments in Fluids, 45, 3, 2008. Crossref
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Wegener Mirco, Muhmood Luckman, Sun Shouyi, Deev Alex V., Novel High-Temperature Experimental Setup to Study Dynamic Surface Tension Phenomena in Oxide Melts, Industrial & Engineering Chemistry Research, 52, 46, 2013. Crossref