Single droplet with or without additives impacting on high-temperature burning liquid pool

Xu, Min; Zhang, JiaQing; Chen, Ruiyu; Lu, Shouxiang

doi:10.1016/j.ijheatmasstransfer.2019.04.145

Cited by 22 publications

(17 citation statements)

References 32 publications

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“…8 that the time required for a vapor explosion was less than 200 ms. In previous studies (Fan et al, 2021;Manzello et al, 2003;Zhigang Wang et al, 2017;Xu et al, 2019Xu et al, , 2018b, the vapor explosion time was much higher than that found in this experiment. In addition, the vapor explosion time increased with increases in the droplet WE at a fixed temperature in the current experiment.…”

Section: Vapor Explosion Timecontrasting

confidence: 75%

“…Due to the vapor explosion, the free liquid surface fluctuated significantly. It took a few hundred milliseconds for the surface of the liquid pool to calm down, which was obviously shorter than the thousands of milliseconds discussed in previous studies (Fan et al, 2021;Manzello et al, 2003;Zhigang Wang et al, 2017;Xu et al, 2019Xu et al, , 2018b. Fig.…”

Section: Vapor Explosionmentioning

confidence: 76%

“…The effects of temperature and WE on the crown height and the energy conversion rate during the crater evolution and the jet evolution were also studied. Xu et al (2019) conducted studies on the collision dynamics of the single droplet with or without additives impinging on unburned or burning oil pool. Vapor explosion occurred when the oil temperature exceeded 210℃ which resulted in flame expansion for droplet impacting on burning oil pool.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Liu

Tang

et al. 2021

Aerosol Air Qual. Res.

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The wall-attached fuel layer of the combustor usually leads to an unstable combustion and produces an unexpected emission, such as aerosol particles and unburn hydrocarbons. In this study, the impaction of ethanol droplet on a heated liquid surface was examined for investigating the factors those could effectively control the fuel atomization and avoided the formation of wall-attached fuel layer. We accelerated the volatilization of ethanol droplets after contacting the liquid surface and even achieved the flash evaporation condition to burst the oil layer, which was conducive to cleaning the inner wall of the combustors and reducing emissions. A 3.12-mm ethanol droplet was used to impact a glycerol pool. The Weber number (WE, 303-1343) and pool temperature (T, 50-260℃) were two controlled parameters to explore the impaction characteristics. There were four typical phenomena observed, including surface dissolving, penetrating dissolution, vapor explosions, and nucleate boiling. Results showed that the maximum volume and surface area of the crater increased with the WE and the liquid pool temperature during impaction. Meanwhile, the boundary temperatures between the penetrating dissolution and the vapor explosion decreased. Additionally, the vapor explosion time increased with the WE but negatively correlated to the liquid pool temperature. The entire vapor explosion process was very short, lasting about 200 millisecond. Furthermore, the increasing WE had a negative effect on the nucleate boiling intensity when the liquid pool temperature significantly enhanced it. Consequently, the fuel droplet atomization and explosion could be sensitively controlled by varying the WE and the temperature of impaction surface. This finding provides valuable information to the designer of combustor control unit to

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Section: Vapor Explosion Timecontrasting

confidence: 75%

Section: Vapor Explosionmentioning

confidence: 76%

Section: Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Liu

Tang

et al. 2021

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

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“…Dynamics of droplet impacting on solid surface is of great significant in various scientific and technological fields, including 3D-printing (Wang et al 2016), spray cooling (Hsieh et al 2016), combustion (Li et al 2020), droplet impact erosion (Ahmad et al 2020), coating (Xu et al 2019), deposition of molten metal droplet (Jung et al 2013) and so on. Characteristic behaviors of droplet impacting on solid surface, containing spreading, retraction, deposition, splashing, partial rebound and rebound (Rioboo et al 2001;Josserand et al 2016;Zhang et al 2019;, are susceptible to physical properties of droplets (Palocios et al 2013;Chen et al 2015;Chen et al 2013;Liu et al 2019;Zhou et al 2019), structure of solid surface (Luo et al 2021;Chen et al 2017) and ambient temperature and pressure (Hao et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the dynamics of droplet impacting on a hydrophobic surface

Zhao

Wang

2023

Preprint

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An experimental visualization is undertaken to investigate the impact dynamic behaviors of water, absolute ethanol, and low surface energy droplets with different viscosities impacting on hydrophobic surfaces. The behaviors of droplets, including spreading, rebounding and oscillation retraction are observed and quantitatively characterized by transient spreading factor and maximum spreading diameter. Effects of droplet impact velocity, surface wettability, and droplet viscosity on the impact dynamics are explored and analyzed. As the droplet impact velocity increases, the droplet kinetic energy increases, resulting in that the spreading factor and spreading velocity increase simultaneously and the maximum spreading diameter of droplets increases with a gradual slower speed. Hydrophobic surfaces are not easily wetted by water droplets due to their low surface energy, leading to the partial rebound of water droplets when they impact on the hydrophobic surfaces. However, this phenomenon does not occur when low surface energy droplets such as absolute ethanol and simethicone impact on hydrophobic surfaces at the same velocity. The increasing droplet viscosity enhances the viscous dissipation, slowing down the impact process and inhibiting the droplet spreading, oscillation and retraction behaviors. Based on the energy conservation method, a universal model for the maximum spreading factor of low surface energy droplets with different viscosities impacting hydrophobic surface was established. According the experimental results, a new spreading time model tm=2D0/U0 was proposed to enhance applicability of the model for low surface energy droplets with high viscosity, reducing the calculation error to less than 10%.

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“…In the numerical part of Berberovic et al [23], advanced free-surface capturing model based on classical VOF model is used. Simultaneous and non-simultaneous impacts of single and multiple droplets on liquid film are numerically investigated in Liang et al [24], Xu et al [25] and Liang et al [26]. The observations conclude that the droplet vertical spacing has negative effects on impact area and minimum residual film thickness.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of rising bubbles in initially quiescent liquids that are later on disturbed by falling drops

Nimmagadda

2020

J Braz. Soc. Mech. Sci. Eng.

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Three-dimensional dynamics of rising bubbles in initially quiescent liquids that are later on disturbed by falling drops has been numerically investigated. The effects of various parameters such as Eotvos number (Eo), Morton number (M), size of the falling drop, single and multiple falling drops on the dynamics of three different cases represented as single bubble rising, inline bubbles rising and offset bubbles rising are investigated. From the results, it is observed that the final bubble rise velocity in disturbed liquid (with Eo = 38.8 and M = 9.71 × 10 −4) due to the impact of falling drop with 0.01 m diameter is increased by 84.21% when compared to the rising bubble in undisturbed quiescent liquid. The same decreases with an increase in the diameter of falling drop up to 0.02 m and 0.03 m, respectively. For inline and offset bubbles, the disturbance caused by the falling drops reduces the final rise velocity by 110% and 113.4%. For Eo = 10.0 and M = 9.71 × 10 −8 , the low fluids internal resistance causes the bubble to rise faster and reach the liquid surface quickly. However, in the case of inline and offset rising bubbles, the bubbles reach the liquid surface even before the falling drop impacts. Keywords Dynamics • Bubbles • Drops • Quiescent • Eotvos • Morton List of symbols D Diameter (m) Eo Eotvos number f Force vector (kg m s −2) g Acceleration due to gravity (m s −2) H Height (m) k Curvature (m −1) L Length (m) M Morton number p Pressure (kg m −1 s −2) Re Reynolds number t Time (s) U Velocity vector (m s −1) W Width (m) Greek symbols α Volume fraction µ Dynamic viscosity (kg m −1 s −1) ρ Density (kg m −3) σ Surface tension (kg s −2) Viscous stress tensor (N m −2) t Turbulent stress tensor (N m −2) Subscripts b Bubble d Drop eq Equivalent g Gas l Liquid r Relative T Terminal z Vertical direction (direction of bubble rise) 1 Lighter fluid (gas) 2 Heavier fluid (liquid) Abbreviations 2D Two-dimensional 3D Three-dimensional VOF Volume of fluid

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Single droplet with or without additives impacting on high-temperature burning liquid pool

Cited by 22 publications

References 32 publications

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Experimental study on the dynamics of droplet impacting on a hydrophobic surface

Dynamics of rising bubbles in initially quiescent liquids that are later on disturbed by falling drops

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