A Design Procedure for Effervescent Atomizers

Chin, J. S.; Lefebvre, A. H.

doi:10.1115/93-gt-337

Cited by 9 publications

(24 citation statements)

References 1 publication

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“…The initial and boundary conditions were defined according to previously published models. [16][17][18] The upstream flow regime and initial flow morphology parameters such as the liquid film and bubble size were determined through the visualization experiments. 19 The atomizer geometries (mixing chamber diameter, exit orifice diameter, exit orifice length) are same with the visualization experiments, as can be seen in Figure 2 (left).…”

Section: Solvability Conditions and Verificationmentioning

confidence: 99%

Numerical simulation of gas–liquid flow behavior in the nozzle exit region of an effervescent atomizer

Sun

Ning

Qiao

et al. 2019

International Journal of Spray and Combustion Dynamics

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The pressure drop and particular geometric structure of the nozzle exit region of an effervescent atomizer cause complex changes in the flow pattern, which could affect the spray performance. In this study, the gas-liquid twophase flow behavior in the nozzle exit region of the effervescent atomizer was investigated numerically. The results show that the flow behaviors in the nozzle exit region have disparate characteristics with different upstream flow regimes. For upstream churn flow, the liquid film morphology is closely related to fluctuation in the gas-liquid velocity, and the flow parameters (fluids' velocities and gas void fraction) at the exit section vary regularly with time. For upstream bubbly flow, the instantaneous gas void fraction is determined by the bubble distribution inside the mixing chamber. The bubble will form a tadpole-like shape as a result of the complex flow field and the surface tension. The flow parameters at the exit section are in an oscillatory decay, and the fluctuation amplitude is larger than for churn flow. For upstream slug flow, the gas void fraction varies significantly with time. The discrete characteristic of the gas-liquid flow parameters at exit section is very obvious.

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Section: Solvability Conditions and Verificationmentioning

confidence: 99%

Numerical simulation of gas–liquid flow behavior in the nozzle exit region of an effervescent atomizer

Sun

Ning

Qiao

et al. 2019

International Journal of Spray and Combustion Dynamics

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“…However, Kushari [5] showed that droplet size decreases with the increase of mixing chamber length. Both Ferreira et al's [6] and Kushari's [5] results showed that the ratio of the exit orifice area to the air injection area influences spray mean drop size in internal mixing twin-fluid atomizers, the same with effervescent atomizers [7]. Shafaee [8] et al found that, increasing of the mixing chamber length causes a little decrease in spray cone angle.…”

Section: Introductionmentioning

confidence: 98%

Geometrical Effects on Spray Performance of a Special Twin-fluid Atomizer without Water Power and its CO2 Absorption Capacity

Yao

Tanaka

Kawahara

et al. 2014

JAPANESE JOURNAL OF MULTIPHASE FLOW

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“…Because of the potential for high volume production, there has been interest in developing nozzle atomization SP, using modified atomization techniques to reduce droplet sizes. One such approach is twin‐fluid atomization (TFA‐SP), which involves the mixing of gas and liquid, to give smaller droplet sizes than conventional pressure sprays 1,8 . Zirconia powders with maximum sizes of only 1–3 μm, similar to what can be achieved by ultrasonic atomization, 9 have been reported from TFA‐SP 10 …”

Section: Introductionmentioning

confidence: 99%

Particle Formation During Spray Pyrolysis of Lead Zirconate Titanate

Nimmo

Ali

Brydson

et al. 2005

Journal of the American Ceramic Society

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A twin‐fluid atomization spray pyrolysis technique has been used to produce lead zirconate titanate (PZT) powders from a sol–gel precursor solution. Samples were removed from ports sited along the reactor in order to examine particle development at progressive stages of pyrolysis. The total time in the reactor was 2.6 s. The size and shape of the particles showed no change between the first port (190°C) and the hottest part of the reactor (820°C), indicating that the physical structure of the particles was established during the initial drying stages. The powders were mainly composed of spherical particles, but irregular forms were also present, which were thought to result from the inward collapse of hollow gelatinous particles. Crystallization of PZT commenced at around 700°C, initially to a pyrochlore or fluorite intermediate phase, with the desired perovskite phase developing between 790°C and 815°C. However, a minor amount of the pyrochlore/fluorite phase persisted in the final powder. The final powders also contained basic lead carbonate, 2PbCO3·Pb(OH)2, which existed in the form of elongated crystallites on the surface of the PZT particles.

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A Design Procedure for Effervescent Atomizers

Cited by 9 publications

References 1 publication

Numerical simulation of gas–liquid flow behavior in the nozzle exit region of an effervescent atomizer

Numerical simulation of gas–liquid flow behavior in the nozzle exit region of an effervescent atomizer

Geometrical Effects on Spray Performance of a Special Twin-fluid Atomizer without Water Power and its CO2 Absorption Capacity

Particle Formation During Spray Pyrolysis of Lead Zirconate Titanate

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