Publicou 12 edições por ano
ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684
Indexed in
TRANSITION FROM HETEROGENEOUS TO HOMOGENEOUS NUCLEATION IN A SIMPLE STRUCTURE FLASH-BOILING ATOMIZER
RESUMO
The flash-boiling method is currently one of the most common atomization methods in household, painting, and pharmaceutical applications. In most of these spaying systems, the atomization unit consists of an inlet orifice, an expansion chamber, and a discharge orifice. Nucleation occurs at the inlet orifice on the walls (heterogeneous nucleation), the bubbles develop in the expansion chamber, and a rapid bubble growth (flash-boiling) occurs when the mixture leaves the discharge orifice. The nucleation process is a major leading phenomenon that dominates the flash-boiling process and thus, the spray characteristics. Former studies (Sher and Elata, 1977; Park and Lee, 1994; Rashkovan et al., 2003; Sher et al., 2008; Bar-Kohany et al., 2004; Bar-Kohany et al., 2007) showed that the flash-boiling method results in high-quality fine sprays, and it is anticipated that homogeneous (rather than heterogeneous) nucleation may result in a much finer spray. Since the timescale of the bubble growth in homogeneous nucleation is much shorter than that in heterogeneous nucleation, using homogeneous nucleation requires a simpler atomization unit construction and thus may be suitable for fuel-injection systems in combustors and engines. In the present work attempted to reach the desired conditions for homogeneous nucleation and propose a simple visualization technique to determine the border between heterogeneous and homogeneous nucleation regimes in a simple single-orifice atomizer.
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Yang Shangze, Ma Zhen, Li Xuesong, Hung David L.S., Xu Min, A review on the experimental non-intrusive investigation of fuel injector phase changing flow, Fuel, 259, 2020. Crossref
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Yang Shangze, Wang Shangning, Sun Zhe, Li Xuesong, Hung David L.S., Xu Min, In-nozzle bubble formation and its effect on fuel jet breakup under cavitating and flash boiling conditions, Applied Thermal Engineering, 183, 2021. Crossref
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Schmidt David, Maulik Romit, Lyras Konstantinos, Machine learning accelerated turbulence modeling of transient flashing jets, Physics of Fluids, 33, 12, 2021. Crossref
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Rees Andreas, Oschwald Michael, Experimental Investigation of Transient Injection Phenomena in Rocket Combusters at Vacuum with Cryogenic Flash Boiling, in Droplet Dynamics Under Extreme Ambient Conditions, 124, 2022. Crossref