Development of an Experimental Method to Evaluate the Stability of Gas-Liquid Sprays

Maldonado, Susanna Lladó; Fleck, Brian A.; Heidrick, T. R.; Amirfazli, Alidad; Chan, Edward; Knapper, Brian

doi:10.1615/atomizspr.v18.i8.20

Cited by 8 publications

(10 citation statements)

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“…In response to the arguments of these two researchers, Andreussi et al confirmed that the fluid droplet size changes due to fragmentation and cementation between twin-fluid in the mixing chamber and the attachment of the orifice wall. It was argued that the length of the mixing chamber and the velocity and density of the gas in the mixing chamber were affected. − As described above, studies have been conducted to confirm the effect of design factors, such as the length of the Y-jet nozzle mixing chamber. However, the change in the diameter ratio of the liquid and gas inlet ports may affect the Sauter mean diameter (SMD), which is also a factor that should be considered when designing the Y-jet nozzle.…”

Section: Introductionmentioning

confidence: 99%

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

2021

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The Y-jet nozzle is simpler to design than other twin-fluid nozzles and has various advantages such as having a wide turn-down ratio. For this reason, it is mainly used for industrial boilers and combustion. The Y-jet nozzle comprises liquid and assist gas supply ports, a mixing chamber, where two fluids (liquid and the assist gas) are mixed, and an exit orifice. The time it takes to mix the two fluids in the mixing chamber depends on the length of the chamber, which determines the spray and particulate properties. Therefore, the mixing chamber is one of the most important factors when designing the Y-jet nozzle. The gas to liquid mass flow rate ratio (GLR) is an important variable that affects the spray characteristics of the Y-jet nozzle. In this work, a laboratory-scale Y-jet nozzle spray experimental setup was developed to perform spray experiments. In particular, we observe the spray properties in the front and right directions to observe spatial spray properties. Significant results were obtained depending on the length of the mixing chamber, the spray pattern, and the Sauter mean diameter according to the GLR. We found that a mixing chamber with longer length reduces the effect of asymmetric spray and confirm that the central axis of spray is more stable.

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Section: Introductionmentioning

confidence: 99%

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

2021

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“…Their experimental images revealed that bubbles undergo a process of deformation when they approach and flow out of the nozzle exit. Maldonado et al (2008) characterized the spray stability based on the analysis of the wall pressure fluctuations (below 40 Hz) in the amplitude, time, and frequency domains. Their results showed the flow pattern entering the nozzle, directly affecting the spray stability.…”

Section: Introductionmentioning

confidence: 99%

Time–frequency analysis of acoustic and unsteadiness evaluation in effervescent sprays

Sun

Ning²,

Lv³

et al. 2015

Chemical Engineering Science

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“…For two-phase flow atomization, there are obvious fluctuations in the gas-liquid flow coefficient in the vicinity of the nozzle due to the gas phase. Maldonado et al [20] studied the pressure fluctuation in the nozzle. The authors found that the flow pattern inside the nozzle had a violent effect on the spray pulsation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

Liu

et al. 2020

Energies

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A two-phase flow ejector is an important part of a water mist fire suppression system, and these devices have become a popular research topic in recent years. This paper proposes a supersonic ejector that aims to improve the efficiency of water mist fire suppression systems. The effects of ejector geometric parameters on the entrainment ratio (ER) were explored. The effects of primary flow pressure (P P ) on the mixing process and flow phenomena were studied by a high-speed camera. The experimental results show that the ER first increases and then decreases with increasing P P . ER increases with increasing ejector area ratio (AR). The P P corresponding to the maximum ER of ejectors with a different nozzle exit position (NXP) is 3.6 bar. The ejector with an NXP of +1 and AR of 6 demonstrate the best performance, and the ER of this ejector reaches 36.29. The spray half-cone angle of the ejector increases with increasing ER, reaching a maximum value of 7.07 • . The unstable atomization half-cone angle is mainly due to a two-phase flow pulsating phenomenon. The pulsation period is 10 ms. In the present study, a general rule that provides a reference for ejector design and selection was obtained through experiments.

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Development of an Experimental Method to Evaluate the Stability of Gas-Liquid Sprays

Cited by 8 publications

References 0 publications

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

Time–frequency analysis of acoustic and unsteadiness evaluation in effervescent sprays

Experimental Investigation of the Performance and Spray Characteristics of a Supersonic Two-Phase Flow Ejector with Different Structures

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