Secondary atomization of a biodiesel micro-emulsion fuel droplet colliding with a heated wall A. E. Ashikhmin, N. A. Khomutov, M. V. Piskunov, V. A. Yanovsky
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ArticleContent type: Текст Media type: электронный Subject(s): микроэмульсионное топливо | биодизель | вторичное распылениеGenre/Form: статьи в журналах Online resources: Click here to access online
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Applied sciences Vol. 10, № 2. P. 685 (1-21)Abstract: Using high-speed video recording, we establish the following regimes of hydrodynamic
interaction of a biodiesel micro-emulsion fuel droplet with a heated wall: deposition (including drop
spreading and receding), drop hydrodynamic breakup, and rebound. Collision regime maps are
plotted using a set of dimensionless criteria: Weber number We = 470–1260, Ohnesorge number
Oh = 0.146–0.192, and Reynolds number Re = 25–198. The scenarios of droplet hydrodynamic
disintegration are studied for transient and film boiling. We also estimate the disintegration
characteristics of a biodiesel micro-emulsion droplet (mean diameter of child droplets, their number,
and evaporation surface area increase due to breakup). The study establishes the eect of water
proportion on the micro-emulsion composition (8–16 vol.%), heating temperature (300–500 C),
droplet size (1.8–2.8 mm), droplet velocity (3–4 m/s), rheological properties of the examined
compositions, and emulsifier concentration (10.45 vol.% and 20 vol.%) on the recorded characteristics.
The results show that the initial liquid surface area can be increased 2–19 times. The paper
analyzes ways to control the process. The hydrodynamic disintegration characteristics of a biodiesel
micro-emulsion fuel droplet are compared using 2D and 3D recording.
Библиогр.: 36 назв.
Using high-speed video recording, we establish the following regimes of hydrodynamic
interaction of a biodiesel micro-emulsion fuel droplet with a heated wall: deposition (including drop
spreading and receding), drop hydrodynamic breakup, and rebound. Collision regime maps are
plotted using a set of dimensionless criteria: Weber number We = 470–1260, Ohnesorge number
Oh = 0.146–0.192, and Reynolds number Re = 25–198. The scenarios of droplet hydrodynamic
disintegration are studied for transient and film boiling. We also estimate the disintegration
characteristics of a biodiesel micro-emulsion droplet (mean diameter of child droplets, their number,
and evaporation surface area increase due to breakup). The study establishes the eect of water
proportion on the micro-emulsion composition (8–16 vol.%), heating temperature (300–500 C),
droplet size (1.8–2.8 mm), droplet velocity (3–4 m/s), rheological properties of the examined
compositions, and emulsifier concentration (10.45 vol.% and 20 vol.%) on the recorded characteristics.
The results show that the initial liquid surface area can be increased 2–19 times. The paper
analyzes ways to control the process. The hydrodynamic disintegration characteristics of a biodiesel
micro-emulsion fuel droplet are compared using 2D and 3D recording.
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