A numerical simulation of jet breakup in melt coolant interactions

Thakre, Sachin; Manickam, Louis; Ma, Weimin

doi:10.1016/j.anucene.2015.02.038

Cited by 46 publications

(11 citation statements)

References 11 publications

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“…4 is similar to that reported for liquid-gas systems (Bürger et al, 1995;Ginsberg, 1985). It is also similar to results from numerical simulations of Wood's metal into water (Thakre et al, 2015). We found the quantitative tendency of the breakup-length curve for our liquid-liquid system to be similar to that for a liquid-gas system.…”

Section: Typical Breakup Regimes and Breakup-length Curvesupporting

confidence: 85%

“…Recently, the literature has been supplemented by numerical studies on jet breakup in immiscible liquid-liquid systems by using the volume-of-fluid method (Thakre et al, 2015), the advanced interface tracking method (Suzuki et al, 2014b), and the lattice Boltzmann method (Iwasawa et al, 2015a;Matsuo et al, 2015;S. Saito et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

“…is often used to characterize the jet breakup length (Bürger et al, 1995;Ginsberg, 1985;Thakre et al, 2015) and the diameters of the resulting fragments (Matsuba et al, 2016b;Nishimura et al, 2010). Matsuo et al (2008) concluded from their melt-water experimental data that the dominant effect on jet breakup was the shear force that acted on the interface.…”

Section: Introductionmentioning

confidence: 99%

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Flow transition criteria of a liquid jet into a liquid pool

Saito

Abe

Koyama

2017

Nuclear Engineering and Design

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To better understand the fundamental interactions between melt jet and coolant during a coredisruptive accident at a sodium-cooled fast reactor, the jet breakup and droplet formation in immiscible liquid-liquid systems were studied experimentally. Experiments using two different pairs of test fluids were carried out at isothermal conditions. The observed jet breakup behavior was classified into characteristic regimes based on the classical Ohnesorge classification in liquid-gas systems. The variation in breakup length obtained in the present liquid-liquid system was similar to that in a liquidgas system. The droplet size distribution in each breakup regime was analyzed using image processing and droplet formation via pinch-off, satellite formation, and entrainment was observed. The measured droplet size was compared with those available from melt jet experiments. Based on the observation and analysis results, the breakup regimes were organized on a dimensionless operating diagram, with the derived correlations representing the criteria for regime boundaries of a liquid-liquid system. Finally, the experimental data were extrapolated to the expected conditions of a sodium-cooled fast reactor. From this, it was implied that most of the hydrodynamic conditions during an accident would be close to the atomization regime, in which entrainment is the dominant process for droplet formation. Nomenclature d droplet diameter Dj0 nozzle diameter

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Section: Typical Breakup Regimes and Breakup-length Curvesupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow transition criteria of a liquid jet into a liquid pool

Saito

Abe

Koyama

2017

Nuclear Engineering and Design

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“…The breakup of jets was observed using a high-speed camera, and the effect of jet velocity on jet breakup length analysed (Morozumi and Fukai, 2004;Zhu et al, 2007;Wan et al, 2008;Negeed et al, 2011;Wang and Fang, 2015). The process of jet breakup was simulated using an algorithm based on the finite volume method and the volume of fluid (VOF) method, and the physics of the breakup and drop formation was captured (Pan and Suga, 2003;Ménard et al, 2007;Jin et al, 2008;Shinjo and Umemura, 2010;Thakre et al, 2015;Tian et al, 2015). Jiang et al (2018) also conducted calculation and experimental verification of the formula based on jet breakup length for PY 1 15 sprinklers.…”

Section: Introductionmentioning

confidence: 99%

Influence of a Fixed Water Dispersion Device on Jet Dispersion and Range From an Impact Sprinkler

Issaka

Jiang

et al. 2019

Irrigation and Drainage

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Fixed water dispersion breaks up and disperses the jet issuing from the nozzle of an impact sprinkler continuously upon impingement. The performance of an impact sprinkler is influenced by the spatial distribution of the dispersed droplets. The objective of this study was to investigate the influence of a fixed water dispersion device on jet dispersion and range from an impact sprinkler. A series of experiments were conducted using high‐speed photography technology to capture images for analysis. A model of the jet was developed and applied in a MatLab computation program to determine the initial jet breakup lengths and the angles of dispersion. Comparison of the calculated values with other formulas indicated an average relative error of less than 10%. The spreading angle was wider with increased working pressure and insertion depth in the jet stream from the device. A semi‐empirical formula of spray range for the test sprinkler with a fixed water dispersion device was established through curve fitting. Because the new formula depends on the angle of dispersion, it may be useful as a simple and quick way to estimate the dispersion and uniformity of water distribution within the area irrigated. © 2019 John Wiley & Sons, Ltd.

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“…In literatures [14][15][16][17][18][19][20] , the breakup process of jet was observed using high speed photography, and the functional effect of jet velocity on jet breakup length was analyzed. In literatures [21][22][23][24][25][26] , the breakup process of jet was simulated using an algorithm based on the finite volume method and the volume of fluid (VOF) method, and the physics about the jet breakup and drop formation was captured. However, previous researches of jet focus on high pressure jet rather than low pressure jet which is used for irrigation sprinklers.…”

Section: Introductionmentioning

confidence: 99%

Calculation and verification of formula for the range of sprinklers based on jet breakup length

Jiang¹,

Li²,

Chen³

et al. 2018

International Journal of Agricultural and Biological Engineering

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Jet breakup length is an important parameter which reflects the length of sprinkler range. Based on the linear instability theory, the dispersion equation of cylindrical jet was established and the theoretical value of jet breakup length was calculated. The jet breakup length and initial amplitude of surface wave were measured by applying the high-speed photography technology. Meanwhile, the numerical simulation was conducted by combining Level Set-VOF method for describing the jet breakup length to verify the theoretical and experimental results. Within the jet velocity and working pressure range of discussion, the results of comparison showed that the theoretical analysis gave a reasonable explanation to the influence of jet velocity, nozzle diameter and nozzle cone angle on jet breakup length. Comparing the theoretical value of jet breakup length with the experimental and simulated values, the three results accorded one another. The experimental jet breakup lengths were the lowest and the simulation values were the largest, and the relative error was less than 10%, especially the theoretical value was closer to the average value. For choosing the theoretical calculation of jet breakup length, a semi-empirical and semi-theoretical formula of range for the rotating sprinkler was concluded by the curve fitting method and the fitting formula was verified. The results showed the high accuracy of the ranges determined by this formula and the average relative error was less than 2.5%. The new formula was in good agreement with the data of different types of sprinklers comparing with other empirical formulas, and the error was only 5%. Meanwhile, the possibility of using this formula widely to determine the ranges of same series of sprinkler was confirmed.

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A numerical simulation of jet breakup in melt coolant interactions

Cited by 46 publications

References 11 publications

Flow transition criteria of a liquid jet into a liquid pool

Flow transition criteria of a liquid jet into a liquid pool

Influence of a Fixed Water Dispersion Device on Jet Dispersion and Range From an Impact Sprinkler

Calculation and verification of formula for the range of sprinklers based on jet breakup length

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