Experimental Study of the Laws of Interaction Between Small Particles and Large Drops

Shraiber, A. A.; Dubrovskyi, V.V.; Podvysotsky, A. M.

doi:10.1615/atomizspr.2014005193

Cited by 3 publications

(2 citation statements)

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“…As reviewed above, numerous previous studies had investigated the spray characterization of plain-jet airblast atomizer, and all of research atomizers have the same structural features that their exit segment are always converged. However, the spray cone angle with those structures would be quite narrow, and the fuel distribution would extremely concentrate on the narrow region; collisions between liquid particles were more likely to occur which lead to large particle droplet production [22], and the same theory had been confirmed with the investigation of Shraiber et al [23]. Yang and Chin had studied the effect of high back pressure on the spray characteristics of a plain-jet injector in coaxial airflow according to experiment.…”

Section: Introductionmentioning

confidence: 86%

Experimental Study of the Effect of the Expansion Segment Geometry on the Atomization of a Plain-Jet Airblast Atomizer

Jin¹,

Yao²,

He³

et al. 2021

International Journal of Aerospace Engineering

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In this paper, the idea of adding an expansion segment over traditional airblast atomizer is proposed to improve the spray performance. According to the systematic experiments, the Sauter mean diameter, the droplet size distribution, and the droplet axial mean velocity were obtained to evaluate the spray performance. The correlations between spray performance and four geometrical parameters of the expansion segment which include the length, the angle, the throat area, and position of liquid jet are considered. The atomizer operates at atmospheric pressure and temperature, and the air liquid ratio range is from 0.48 to 2.85. The data of the results were measured by Phase Doppler Particle Analyzer. The results show that more uniform droplet size distribution can be achieved with the addition of expansion segment, and the droplet size distribution factor q of the case adding the expansion segment is 52.8% bigger than that of the case with no expansion segment. q increases as the length and angle of expansion segment increase. The Sauter mean diameter can be reduced by either reducing the length or angle of expansion segment. As for droplet velocity, it is determined that the droplet velocity increases along the radial direction, which is noteworthy because opposite trend is reported for traditional plain-jet atomizers. With an increase of the length, angle, and throat area of the expansion segment, the droplet axial velocity decays.

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Section: Introductionmentioning

confidence: 86%

Experimental Study of the Effect of the Expansion Segment Geometry on the Atomization of a Plain-Jet Airblast Atomizer

Jin¹,

Yao²,

He³

et al. 2021

International Journal of Aerospace Engineering

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“…Atomization and cavitation are the two important approaches to generating droplets [3][4][5]. Owing to the smaller droplets size, larger coverage of droplets, and wider applicability, the excellent performance of atomizing technology has motivated intensive studies in many fields [6][7][8][9]. However, the spray process of a twin-fluid nozzle involves multiphase coupling, dynamic changing, evaporation, and condensation, which have great influence on the stability and uniformity of droplets in the spray field and the atomizing efficiency of the twin-fluid nozzle.…”

Section: Introductionmentioning

confidence: 99%

Influence of Self-excited Vibrating Cavity Structure on Droplet Diameter Characteristics of Twin-fluid Nozzle

Chen

Gao

et al. 2018

Chin. J. Mech. Eng.

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It is a great challenge to find effective atomizing technology for reducing industrial pollution; the twin-fluid atomizing nozzle has drawn great attention in this field recently. Current studies on twin-fluid nozzles mainly focus on droplet breakup and single droplet characteristics. Research relating to the influences of structural parameters on the droplet diameter characteristics in the flow field is scarcely available. In this paper, the influence of a self-excited vibrating cavity structure on droplet diameter characteristics was investigated. Twin-fluid atomizing tests were performed by a self-built open atomizing test bench, which was based on a phase Doppler particle analyzer (PDPA). The atomizing flow field of the twin-fluid nozzle with a self-excited vibrating cavity and its absence were tested and analyzed. Then the atomizing flow field of the twin-fluid nozzle with different self-excited vibrating cavity structures was investigated. The experimental results show that the structural parameters of the self-excited vibrating cavity had a great effect on the breakup of large droplets. The Sauter mean diameter (SMD) increased with the increase of orifice diameter or orifice depth. Moreover, a smaller orifice diameter or orifice depth was beneficial to enhancing the turbulence around the outlet of nozzle and decreasing the SMD. The atomizing performance was better when the orifice diameter was 2.0 mm or the orifice depth was 1.5 mm. Furthermore, the SMD increased first and then decreased with the increase of the distance between the nozzle outlet and self-excited vibrating cavity, and the SMD of more than half the atomizing flow field was under 35 μm when the distance was 5.0 mm. In addition, with the increase of axial and radial distance from the nozzle outlet, the SMD and arithmetic mean diameter (AMD) tend to increase. The research results provide some design parameters for the twin-fluid nozzle, and the experimental results could serve as a beneficial supplement to the twin-fluid nozzle study.

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A Numerical Study on Droplet-Particle Collision

Vilela

Souza

2020

Flow Turbulence Combust

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Experimental Study of the Laws of Interaction Between Small Particles and Large Drops

Cited by 3 publications

References 0 publications

Experimental Study of the Effect of the Expansion Segment Geometry on the Atomization of a Plain-Jet Airblast Atomizer

Experimental Study of the Effect of the Expansion Segment Geometry on the Atomization of a Plain-Jet Airblast Atomizer

Influence of Self-excited Vibrating Cavity Structure on Droplet Diameter Characteristics of Twin-fluid Nozzle

A Numerical Study on Droplet-Particle Collision

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