Atomization characteristics and instabilities in the combustion of multi-component fuel droplets with high volatility differential

Rao, D Chaitanya Kumar and Karmakar, Srinibas and Basu, Saptarshi (2017) Atomization characteristics and instabilities in the combustion of multi-component fuel droplets with high volatility differential. In: SCIENTIFIC REPORTS, 7 .

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Abstract

We delineate and examine the successive stages of ligament-mediated atomization of burning multicomponent fuel droplets. Time-resolved high-speed imaging experiments are performed with fuel blends (butanol/Jet A-1 and ethanol/Jet A-1) comprising wide volatility differential, which undergo distinct modes of secondary atomization. Upon the breakup of vapor bubble, depending on the aspect ratio, ligaments grow and break into well-defined (size) droplets for each mode of atomization. The breakup modes either induce mild/intense oscillations on the droplet or completely disintegrate the droplet (micro-explosion). For the blends with a relatively low volatility difference between the components, only bubble expansion contributes to the micro-explosion. In contrast, for blends with high volatility differential, both bubble growth as well as the instability at the interface contribute towards droplet breakup. The wrinkling pattern at the vapor-liquid interface suggests that a RayleighTaylor type of instability triggered at the interface further expedites the droplet breakup.

Item Type:	Journal Article
Publication:	SCIENTIFIC REPORTS
Additional Information:	Copy right for this article belongs to the NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	16 Sep 2017 06:18
Last Modified:	16 Sep 2017 06:18
URI:	http://eprints.iisc.ac.in/id/eprint/57813

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