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Open AccessFeature PaperArticle

Secondary Atomization of a Biodiesel Micro-Emulsion Fuel Droplet Colliding with a Heated Wall

1
National Research Tomsk Polytechnic University, 30 Lenin Avenue, 634050 Tomsk, Russia
2
National Research Tomsk State University, 36 Lenin Avenue, 634050 Tomsk, Russia
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(2), 685; https://doi.org/10.3390/app10020685
Received: 23 December 2019 / Revised: 13 January 2020 / Accepted: 13 January 2020 / Published: 18 January 2020
(This article belongs to the Special Issue Heat and Mass Transfer in Intense Liquid Evaporation)
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 effect 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. View Full-Text
Keywords: micro-emulsion fuel; biodiesel; heated wall; interaction; impact outcome; child droplets micro-emulsion fuel; biodiesel; heated wall; interaction; impact outcome; child droplets
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MDPI and ACS Style

Ashikhmin, A.E.; Khomutov, N.A.; Piskunov, M.V.; Yanovsky, V.A. Secondary Atomization of a Biodiesel Micro-Emulsion Fuel Droplet Colliding with a Heated Wall. Appl. Sci. 2020, 10, 685.

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