Bubble formation and flow instability in an effervescent atomizer

Sen, Debjyoti; Balzan, Miguel A.; Nobes, David S.; Fleck, Brian A.

doi:10.1007/s12650-014-0196-3

Cited by 18 publications

(12 citation statements)

References 10 publications

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“…A two phase flow is then pushed downstream to the exit orifice and it is disintegrated when it passes through the exit orifice [17]. The character of the two phase flow depends mainly on the GLR and on the dimensions of the mixing chamber [3,5,18]. Therefore differences between examined operating regimes are expected.…”

Section: Outside-in Gas Effervescent Atomizermentioning

confidence: 99%

Evaluation of Steadiness and Drop Size Distribution in Sprays Generated by Different Twin-Fluid Atomizers

Zaremba

Mlkvik

Malý

et al. 2015

EPJ Web of Conferences

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Abstract. Twin-fluid atomizers underwent a significant development during the last few decades. They are common in many industrial applications such as fuel spraying, melt atomization and food processing. This paper is focused on the evaluation of four different twin-fluid atomizers. The aim is to compare the quality of sprays generated by various atomizers with similar dimensions and in the same operating regimes. A phaseDoppler anemometry (PDA) and particle image velocimetry (PIV) were used to measure spray characteristics such as velocity and size of the droplets. Measured data were used to compare droplet size distribution and to evaluate steadiness of the spray. Visualisations were made to support measured data and to clarify the principles of primary atomization and its influence on the spray.

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Section: Outside-in Gas Effervescent Atomizermentioning

confidence: 99%

Evaluation of Steadiness and Drop Size Distribution in Sprays Generated by Different Twin-Fluid Atomizers

Zaremba

Mlkvik

Malý

et al. 2015

EPJ Web of Conferences

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“…Due to the pressure difference between the suction chamber and the secondary flow, the secondary fluid can be entrained in the primary flow in the form of small droplets or bubbles [17]. The phenomenon of spray pulsating exists in all nozzles [18,19]. 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.…”

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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“…Therefore, the target now is to enhance the jatropha biofuel atomization. In the literature and from the various atomization techniques, effervescent atomization [8][9][10] is one of the promising atomization techniques dedicated for high viscosity fuels. This atomization method is internal mixing twin fluid technique.…”

Section: Introductionmentioning

confidence: 99%

“…This atomization method is internal mixing twin fluid technique. It has been shown to produce well-atomized spray with only small amount of atomizing gas at low injection pressure [8,9]. Further, it has the capability of atomizing high viscosity fuels well [10].…”

Section: Introductionmentioning

confidence: 99%

“…Further, the presence of gas bubbles inside the atomizer squeezes the liquid as the gas occupies large portion due to its higher specific volume. The reduced liquid characteristic length at atomizer exit enhances the liquid atomization in turn [8,9]. Moreover, the squeezed liquid becomes faster, to preserve flow continuity, which enhance liquid shattering and shear [8].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Jatropha Biofuel Viscosity on Internal Two Phase Flow Inside Ffervescent Atomizer for Gas Turbine Applications

Helmy¹,

Wilson²,

Balabel³

2016

The International Conference on Applied Mechanics and Mechanica

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In the current work, three-dimensional simulations of the internal flow inside effervescent atomizer are performed. For this purpose, the volume of fluid model combined with the two equation realizable ݇-ߝ turbulence model are adopted. Validation with previous work in the literature is performed and the current results compare well. The internal flow results are then compared for both jet-A1 fuel and jatropha biofuel, as alternative fuel for commercial aviation. The present results show that the flow inside the atomizer evolves with gas to liquid mass ratio (GLR). Slug flow is identified for both fuels at low GLRS (below 0.3%) while annular flow is obtained at higher GLRs (above 0.3%). The effect of biofuel viscosity on the flow is obvious at GLRs below 0.3% and is relatively inhibited at higher values of GLR (0.8%). Finally the current results show the capability of effervescent atomizer in handling jatropha biofuel, in terms of internal flow. KEY WORDSJatropha biofuel, effervescent atomizer, two-phase flow, volume of fluid and aviation * Assist. Lecturer,

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Bubble formation and flow instability in an effervescent atomizer

Cited by 18 publications

References 10 publications

Evaluation of Steadiness and Drop Size Distribution in Sprays Generated by Different Twin-Fluid Atomizers

Evaluation of Steadiness and Drop Size Distribution in Sprays Generated by Different Twin-Fluid Atomizers

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

Effect of Jatropha Biofuel Viscosity on Internal Two Phase Flow Inside Ffervescent Atomizer for Gas Turbine Applications

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