Range formula based on angle of dispersion and nozzle configuration from an impact sprinkler

Jiang, Yue; Issaka, Zakaria; Li, Hong; Tang, Pan; Chen, Chao

doi:10.25165/j.ijabe.20191205.4646

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…7. The overall sight of the dispersion intensity of disintegrated ligaments and droplets from the jet surface, represented in the prevalence of contour line of 0.05 ALVF in the domain [50], [51], can be noted from Fig. 7.…”

Section: Average Contoursmentioning

confidence: 98%

Impact of the jet velocity on the turbulent liquid jet

Said,

Abdelsamie,

Emara

et al. 2023

Engineering Research Journal

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This numerical study aims to investigate the impact of jet velocity and nozzle diameter on liquid turbulent jet. Incompressible large eddy simulations (LES) with Wall-Adapting Local Eddy-Viscosity (WALE) sub-grid scale model in ANSYS-FLUENT were performed to capture the morphology of the breakup as well as the important flow field characteristics. A volume of fluid (VOF) approach was used to track the unsteady evolution and breakup of the liquid jet. Different results have been analyzed to assess this impact. These results are instantaneous and timeaveraged axial velocity, liquid volume fraction, and turbulent kinetic energy. The results are represented in contours and centerline-and radial-profiles. The surrounding gas density is 34.5 kg/m 3 . The nozzle exit diameter is 0.05 mm. Three jet exit-velocities of 50 m/s, 100 m/s and 150 m/s are considered. The results showed that the predicted location, where drops and ligaments are first seen, moves away from the nozzle as the jet velocity increases, where this location was computed as 𝑥 = 3.5𝐷, 6.5𝐷 and 7.5𝐷 for Case50, Case100 and Case150, respectively. Also, the predicted location, where surface waves developed from Kelvin-Helmholtz instability are first seen, moves towards the nozzle as the jet velocity increases, where this location was computed as 𝑥 = 1.6𝐷, 1𝐷 𝑎𝑛𝑑 0.5𝐷 for Case50, Case100 and Case150, respectively. Regarding the jet dispersion angle and the liquid core length, it was found that they increase with increasing the jet exit velocity.

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Section: Average Contoursmentioning

confidence: 98%

Impact of the jet velocity on the turbulent liquid jet

Said,

Abdelsamie,

Emara

et al. 2023

Engineering Research Journal

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“…There are 3 different criteria for defining the jet boundary as reported by Iyer and Abraham [49]. The criterion consistent with Jiang et al [50] was adopted in this work. The criterion states that the boundary is defined as the locus of points having a fixed low value of liquid volume fraction.…”

Section: Average Contoursmentioning

confidence: 99%

Impact of Surrounding Gas Density on the Turbulent Liquid Jet

et al. 2023

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This numerical study aims to investigate the impact of surrounding gas density on liquid turbulent jet. Incompressible large eddy simulations (LES) with Wall-Adapting Local Eddy-Viscosity (WALE) sub-grid scale model in ANSYS-FLUENT were performed to capture the morphology of the breakup as well as the important flow field characteristics. A volume of fluid (VOF) approach was used to track the unsteady evolution and breakup of the liquid jet. Different variables have been examined to assess this impact. These variables are instantaneous velocity, liquid volume fraction, and turbulent kinetic energy. Also, the centerline values have been investigated to obtain the jet half-width and spray dispersion angle. The jet diameter and exit velocity are 0.2 mm and 100 m/s, respectively. Three different liquid-to-gas density ratios of 54.03, 32.42 and 23.49 are considered, corresponding to ambient gas density of 15, 25 and 34.5 kg/m3, respectively. It has been found that the jet speed and the liquid core length are inversely proportional to the density of the ambient gas. Regarding the liquid core length, it was noted that the effect of gas density on the liquid core length is considerably stronger in the gas density range between 15 - 25 kg/m³ (corresponding to density ratios of 54.03 - 32.42) than that in the range of 25 - 34.5 kg/m³ (corresponding to density ratios of 32.42 - 23.49). The results, also, showed that increasing the gas density leads to an increase in Weber number, which in turn causes a high instability, that makes the breakup initiates closer to the nozzle exit and occurs with higher rate. Likewise, it has been found that the jet width and the spray dispersion angle increase with increasing the gas density. HIGHLIGHTS Spray jets are included in many applications because its important in increasing the heat and mass transfer between the liquid and the surrounding fluid Large eddy simulations (LES) and volume of fluid (VOF) models are used to investigate the characteristics of turbulent liquid jet The investigation was characterized as a function of man variables such as turbulent kinetic energy, liquid potential core, the jet dispersion angle and more The investigation showed that the density of surrounding gas has an influence on the liquid jet characteristics GRAPHICAL ABSTRACT

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“…Currently, research on jet‐breaking characteristics is mainly carried out using experimental methods. The influence of an impact sprinkler NSWDD was studied by Jiang et al (2019), focusing on the crushing characteristics of the impinging jet under low pressure using high‐speed photography. It was found that the diffusion angle of the impinging jet gradually decreased with increasing jet velocity.…”

Section: Introductionmentioning

confidence: 99%

Effects of the depth of the needle‐shaped water dispersion device inserted into the jet on the jet breakup of sprinklers

Pan

Jiang

2023

Irrigation and Drainage

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Needle‐shaped water dispersion devices (NSWDDs) can break the jet and make the sprinkler spray evenly even under low working pressure. However, an inappropriate selection of the depth at which the NSWDD is inserted into the jet will affect the sprinkler pattern radius. To study the effect of the NSWDD insertion depth on the jet breakup, the jet structure, atomization, vorticity, static pressure and velocity distribution are studied using a combination of the lattice Boltzmann method and high‐speed photography. The results show that as the insertion depth increases, the jet structures gradually evolve from liquid films to ligaments, causing the diffusion angle of the jet to increase. Under the same operating pressure, the degree of jet atomization increases with increasing insertion depth. Meanwhile, the velocity pulsation degree on the central axis gradually increases, which will cause the jet to have a shorter air travelling distance. As the insertion depth and the radial position distance from the nozzle outlet increase, the velocity on the radial line first exhibits a symmetrical distribution, then an asymmetric one and finally a symmetric one again. The results can fill the gap in previous research on the effects of the NSWDD on jet breakup.

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Range formula based on angle of dispersion and nozzle configuration from an impact sprinkler

Cited by 7 publications

References 24 publications

Impact of the jet velocity on the turbulent liquid jet

Impact of the jet velocity on the turbulent liquid jet

Impact of Surrounding Gas Density on the Turbulent Liquid Jet

Effects of the depth of the needle‐shaped water dispersion device inserted into the jet on the jet breakup of sprinklers

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