Experimental investigation and model improvement on the atomization performance of single-hole Y-jet nozzle with high liquid flow rate

Zhou, Yuegui; Zhang, Mingchuan; Yu, Jiang; Zhu, Xian; Peng, Jinliang

doi:10.1016/j.powtec.2010.01.013

Cited by 24 publications

(12 citation statements)

References 15 publications

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“…Twin-fluid atomizers have been used in numerous industrial applications over the years such as gas turbines (Lefebvre, 1988), internal combustion engines (Wade et al, 1999), spray drying (Mujumdar et al, 2010), spray coating (Esfarjani and Dolatabadi, 2009), scramjet engines (Gadgil and Raghunandan, 2011), fire suppression (Huang et al, 2011), process industries (Loebker and Empie, 1997), and power plants (Zhou et al, 2010 to augment the atomization process; they are classified into internally and externally mixing twin-fluid atomizers. In externally mixing atomizers, high-velocity gas or steam impinges on the liquid just outside the discharge orifice, while in internally mixing ones, the gas or steam mixes with the liquid inside the nozzle before being injected.…”

Section: Introductionmentioning

confidence: 99%

“…However, external mixing atomizers have the advantage of producing sprays with constant spray angle at all liquid flow rates independently of the back pressure, as there is no communication between the flowing media internally. Undoubtedly, there are various ways to generate the atomized sprays using various types of nozzles, including, for example, rotary cups (Nguyen and Rhodes, 1998), twin fluids (Lefebvre, 1988;Wade et al, 1999;Li et al, 2018;Mujumdar et al, 2010;Esfarjani and Dolatabadi, 2009;Gadgil and Raghunandan, 2011;Huang et al, 2011;Loebker and Empie, 1997;Zhou et al, 2010), pressure swirl (Radcliffe, 1955;Dafsari et al, 2017;Arcoumanis et al, 1999a), fan (Dombrowski et al, 1960), ultrasonic (Lang, 1962), electrostatic (Maski and Durairaj, 2010), diesel injectors (Arcoumanis et al, 1999b;Mitroglou and Gavaises, 2011), and effervescent atomizers (Sovani et al, 2001;Saleh et al, 2018); solid or hollow cone sprays may form depending on the type of atomizer and operating conditions. However, in thermal power plants or oil-fired large industrial boilers, operating with high flow rates of viscous fuel, mostly Y-jet or internal mixing chamber twin-fluid atomizers are used (Barreras et al, 2006b).…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Geometrical and Operational Parameters on Internal Flow Characteristics of Internally Mixing Twin-Fluid Y-Jet Atomizers

et al. 2019

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Internally mixing twin-fluid Y-jet atomizers are widely used in coal-fired thermal power plants for start-up, oil-fired thermal power plants, and industrial boilers. The flow through internally mixing Y-jet atomizers is numerically modeled using the compressible Navier-Stokes equations; wall modeled large eddy simulations (WMLES) are used to resolve the turbulence with large eddy simulations whereas the Prandtl mixing length model is used for modeling the subgrid scale structures, which are affected by geometric and operational parameters. Moreover, the volume-of-fluid (VOF) method is used to capture the development and fragmentation of the liquid-gas interface within the Y-jet atomizer. The numerical results are compared with correlations available in the open literature for the pressure drop; further results are presented for the multiphase flow regime maps available for vertical pipes. The results show that the mixing point pressure is strongly dependent on the mixing port diameter to air port diameter ratio, specifically for gas to liquid mass flow-rate ratio (GLR) in the range 0.1 < GLR < 0.4; the mixing port length moderately affects the mixing point pressure while the angle between mixing and liquid ports is found not to have an appreciable effect. Moreover, it is found that the vertical pipe multiphase flow regime maps in the literature could be applied to the flow through the mixing port of the twin-fluid Y-jet atomizer. The main flow regimes found under the studied operational conditions are annular and wispy-annular flow.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Geometrical and Operational Parameters on Internal Flow Characteristics of Internally Mixing Twin-Fluid Y-Jet Atomizers

et al. 2019

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“…Y-jet nozzles in particular have been widely used in oil boilers, industrial furnaces, agricultural sprays, spray dryers and paint sprays (Zhou et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Twin-fluid atomization of viscous liquids: The effect of atomizer construction on breakup process, spray stability and droplet size

Mlkvik

Stähle

Schuchmann

et al. 2015

International Journal of Multiphase Flow

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“…Recently, Zhou et al [19] have worked on an experimental investigation of the atomization performance of single-hole Y-Jet nozzle. Although they have found interesting results for the dependence of the droplet mean diameter of the sprays on the air-liquid ratio, they did not take into account the mechanisms of the internal flow that could influence the spray quality.…”

Section: Introductionmentioning

confidence: 99%

The influence of geometrical and operational parameters on Y-jet atomizers performance

Pacifico

Yanagihara

2013

J Braz. Soc. Mech. Sci. Eng.

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The effects of operational and geometrical parameters on pressure distribution and flow pattern in Y-jet atomizers were studied using an experimental apparatus working with air and water. The results show that the mixing point pressure is very dependent on the diameter ratio of the mixing duct and the air port and the water supply pressure ratio. A correlation to predict the mixing point pressure was developed and showed good agreement with the experimental data. With this correlation, it is possible to predict the occurrence of the critical condition for the air flow at the exit of its port. In a second group of results, the influence of geometrical and operational parameters on the pressure distribution inside the mixing duct was analyzed. The main result found was that for air liquid ratio between 0.1 and 0.2, this pressure distribution can be taken as linear. This information about air liquid ratio and the correlation to predict the occurrence of chocked flow at the exit of the air port may give useful guidelines for atomizer designers. Finally, using a two-phase map, the flow pattern inside Y-jet atomizers was found to be a transition between the annular flow and the wispy-annular flow. Keywords Y-jet atomizers Á Twin-fluid atomizers Á Two-phase flow patterns Á Experimental correlations List of symbols ALR Air liquid ratio d Diameter [m] G Fluid mass velocity [kg/m 2 s] j Superficial velocity [m/s] l Length [m] p Pressure [Pa] SR Slope ratio T Temperature [K] _ m Mass flow rate [kg/s] z Position [m] Non-dimensional groups We Weber number Greek symbols c Ratio of specific heats Dp Pressure drop [Pa] h Angle between air and water ports [rad] q Density [kg/m 3 ] u Momentum ratio Subscripts 1 Middle point pressure measurement in mixing duct 2 End point pressure measurement in mixing duct a Air w Water ha Air at upstream position of the tape orifice plate M Mixing point m Mixing duct

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Experimental investigation and model improvement on the atomization performance of single-hole Y-jet nozzle with high liquid flow rate

Cited by 24 publications

References 15 publications

The Influence of Geometrical and Operational Parameters on Internal Flow Characteristics of Internally Mixing Twin-Fluid Y-Jet Atomizers

The Influence of Geometrical and Operational Parameters on Internal Flow Characteristics of Internally Mixing Twin-Fluid Y-Jet Atomizers

Twin-fluid atomization of viscous liquids: The effect of atomizer construction on breakup process, spray stability and droplet size

The influence of geometrical and operational parameters on Y-jet atomizers performance

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