Numerical and experimental study on the spray characteristics of full-cone pressure swirl atomizers

Sun, Yubiao; Alkhedhair, Abdullah M.; Guan, Zhiqiang; Hooman, Kamel

doi:10.1016/j.energy.2018.07.060

Cited by 57 publications

(38 citation statements)

References 44 publications

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“…High viscosity will reduce the turbulence of the flow and the breakup of the liquid film, which makes the spray SMD increase. Sun et al (2018) revealed that the SMD near the orifice is small because turbulence kinetic energy of air near the orifice is maximum. The spray cone angles reflect the distribution of the droplets in the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

Effect of Viscosities on the Spray Characteristics of Pressure Swirl Nozzle

Liu

Lin

Zheng

et al. 2020

JAFM

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The effects of medium viscosity on the spray flow rate, spray Sauter Mean Diameter, droplet velocity and spray cone angle of pressure swirl nozzles are investigated by making use of the particle dynamics analysis system and high-speed photographic system. Based on the axial and radial distribution characteristics of Sauter Mean Diameter and droplet velocity, the water-glycerol mixture is used to simulate medium with a wide range of viscosities. It is found that with the increase of viscosity, the turbulence of the medium flow and the swirling effect is weakened, and the rated pressure becomes larger and the spray flow rate increases. Spray Sauter Mean Diameter and droplet axial velocity becomes larger, while the spray cone angle decreases. The development of the axial velocity distribution of spray cone is characterized by the radial and axial position parameters. The area of the large-droplet region on both sides of spray cone becomes larger, and the area of small-droplet region near the axis becomes smaller.

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Section: Introductionmentioning

confidence: 99%

Effect of Viscosities on the Spray Characteristics of Pressure Swirl Nozzle

Liu

Lin

Zheng

et al. 2020

JAFM

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“…The TAB model is used to describe the secondary crushing process of swirling atomized droplets [8,15]. The droplet surface force is defined as a three-part composition of a dynamic equation, surface tension, and viscous force and can be expressed as follows upon the introduction of the expression of deformation rate y = x/(C b r):…”

Section: Discrete Phasementioning

confidence: 99%

“…The relationship between different flow rates and atomization angles is illustrated in Fig. 5, where the atomization angle is defined as the angle between two envelope tangents [15,25]. When the value of fluid flow exceeds 0.62 m 3 h -1 , the remarkable attenuation in the increasing trend of atomization angle indicates that the water flow rate has a negligible effect on droplet diffusion around the orifice.…”

Section: Atomization Angle Qmentioning

confidence: 99%

“…Numerical simulation technology has been widely used to analyze atomization characteristics. Sun et al [15] employed the Eulerian-Lagrangian scheme and found that the entrainment effect in atomization causes small droplets to concentrate on the spray axis. Hassani et al [8] used Taylor analogy-breaking (TAB) and Reitz-Diwakar models to characterize the secondary atomization of droplets and discovered that the TAB model reaches stability within a shorter time.…”

Section: Introductionmentioning

confidence: 99%

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Atomization and Mixing Characteristics of Swirl‐Flow Atomizers in the Refining Industry

Jin

et al. 2020

Chem Eng & Technol

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Swirl atomizers are commonly used by refining and chemical companies to wash out ammonium chloride deposits. Experiments and numerical simulation were performed to investigate the atomization and mixing characteristics of swirl atomizers. The volume‐of‐fluid Lagrangian method was applied in the simulation, and its results were compared with experimental data to validate its accuracy. Results demonstrated that the entrainment effect of the airflow changed the atomization angle and coverage area of water. Momentum exchanges between water and airflow promoted the fracture of liquid membranes and formed small droplets.

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“…It is; therefore, necessary to conduct further research in this area as the description of conical sheets breakup mechanisms is rather scarce in the literature [89]. The measured droplet diameters are mostly much larger compared to different types of atomizers, which produce droplets in the range up to 100-150 µm in diameter, refer to, for example, [58,[90][91][92][93], but in a similar order as compared to fire sprinklers [64,79,94]. Comparing the Sauter mean diameter empirical formulas developed for different atomizers we can also see rather significant differences.…”

Section: Droplet Size Distributionmentioning

confidence: 99%

Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle

2019

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Spiral nozzles are widely used in wet scrubbers to form an appropriate spray pattern to capture the polluting gas/particulate matterwith the highest possible efficiency. Despite this fact, and a fact that it is a nozzle with a very atypical spray pattern (a full cone consisting of three concentric hollow cones), very limited amount of studies have been done so far on characterization of this type of nozzle. This work reports preliminary results on the spray characteristics of a spiral nozzle used for gas absorption processes. First, we experimentally measured the pressure impact footprint of the spray generated. Then effective spray angles were evaluated from the photographs of the spray and using the pressure impact footprint records via Archimedean spiral equation. Using the classical photography, areas of primary and secondary atomization were determined together with the droplet size distribution, which were further approximated using selected distribution functions. Radial and tangential spray velocity of droplets were assessed using the laser Doppler anemometry. The results show atypical behavior compared to different types of nozzles. In the investigated measurement range, the droplet-size distribution showed higher droplet diameters (about 1 mm) compared to, for example, air assisted atomizers. It was similar for the radial velocity, which was conversely lower (max velocity of about 8 m/s) compared to, for example, effervescent atomizers, which can produce droplets with a velocity of tens to hundreds m/s. On the contrary, spray angle ranged from 58° and 111° for the inner small and large cone, respectively, to 152° for the upper cone, and in the measured range was independent of the inlet pressure of liquid at the nozzle orifice.

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Numerical and experimental study on the spray characteristics of full-cone pressure swirl atomizers

Cited by 57 publications

References 44 publications

Effect of Viscosities on the Spray Characteristics of Pressure Swirl Nozzle

Effect of Viscosities on the Spray Characteristics of Pressure Swirl Nozzle

Atomization and Mixing Characteristics of Swirl‐Flow Atomizers in the Refining Industry

Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle

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