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Post-impact spreading of hydrocarbon fuel drops impacting on a solid surface

Bhat, M and Sivakumar, D (2020) Post-impact spreading of hydrocarbon fuel drops impacting on a solid surface. In: 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018, 22-26 July 2018, Chicago; United States.

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Abstract

The impact process of hydrocarbon fuel drops under ambient temperature conditions exhibits no receding however undergoes post-impact spreading after reaching the maximum spreading diameter in the inertia-driven spreading regime. The difference between the maximum spreading diameter measured at the end of inertia-driven spreading phase and final diameter measured at instant far away from the start of impact is not well documented in previous studies. The present study analyzes the inertia-driven maximum spreading and the post-impact final spreading of impacting fuel drops on a smooth solid surface under ambient atmospheric temperature condition. Four hydrocarbon fuels, n-heptane, n-decane, Jet A-1 and diesel, are considered in the study. The experiments of drop impact are conducted at varying Weber number in the range 27 - 914. The temporal variation of impacting drop parameters is deduced from high speed videos of drop impact dynamics captured during experiments. The experimental measurements of maximum spreading diameter are verified with the support of existing theoretical models.The measured final spreading diameter is always higher than the maximum spreading diameter and the variation in the difference between the two parameters with Weber number is described for different fuels. A systematic analysis of spreading dynamics beyond the inertia-driven maximum spreading is carried out. The results arrived from the analysis is useful to distinguish the post-impact spreading of impacting drops with the static spreading (with no impact velocity) of fuel drops. © 2018 Solar Turbines Incorporated.

Item Type: Conference Paper
Publication: ICLASS 2018 - 14th International Conference on Liquid Atomization and Spray Systems
Publisher: ILASS
Additional Information: The copyright of this article belongs to ILASS Europe, Institute for Liquid Atomization and Spray Systems
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 02 Mar 2021 07:45
Last Modified: 02 Mar 2021 07:45
URI: http://eprints.iisc.ac.in/id/eprint/66627

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