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ICLASS 2009, 11th Triennial International Annual Conference on Liquid Atomization and Spray Systems, Vail, Colorado USA, July 2009
 

Summary: ICLASS 2009, 11th
Triennial International Annual Conference on Liquid Atomization and Spray Systems, Vail, Colorado USA, July 2009
High-Speed Internal Nozzle Flow Visualization of Flashing Jets
H. Vu and G. Aguilar*
Department of Mechanical Engineering
University of California-Riverside
Riverside, CA USA
Abstract
Flashing or thermodynamic breakup of a liquid jets occurs when a pressurized, subcooled or saturated liquid is
released to a lower pressure, resulting in violent vapor nucleation, expansion, and breakup of the liquid phase. Flash-
ing is known to produce very fine droplet atomization, often not possible by other means. Despite its usefulness as
an atomization method, the fundamental processes involved in flashing remain poorly understood. This has limited
its applicability due to a lack of control of spray characteristics. In a previous study, several new flashing modes
emanating from long tube nozzles were discovered through high-speed imaging and depended on the level of super-
heat. Breakup mode and frequency appeared to be highly dependent on the state of two-phase internal flow within
the nozzle.
In this study, a review of the state of knowledge of flashing sprays is presented along with motivation for con-
tinuing research. Ongoing work is also described in which internal flashing phenomena were observed using trans-
parent glass tube nozzles. Water was used as the working fluid and was preheated and pressurized within a sample
cylinder prior to release to the atmosphere. These nozzles allowed for imaging of the developing internal two-phase

  

Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside

 

Collections: Engineering