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Impact dynamics of alternative jet fuel drops on heated stainless steel surface

Sen, Suchibrata and Vaikuntanathan, Visakh and Sivakumar, D (2017) Impact dynamics of alternative jet fuel drops on heated stainless steel surface. In: INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 121 . pp. 99-110.

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Official URL: http://doi.org/10.1016/j.ijthermalsci.2017.07.006

Abstract

There is an emerging trend of employing bio-derived alternative fuels in automobile and aircraft engines to meet the strict norms of environmental pollution. The present study deals with the impact dynamics of camelina-derived alternative jet fuel drops corresponding to Weber number, We in the range 28-886 on heated flat stainless steel surface at surface temperature, T-s ranging from 25 degrees C to 350 degrees C. The entire impact dynamics is captured using a high speed camera and analyzed to deduce the temporal variation of normalised drop contact diameter, 1 for the drop impact cases at different T-s. The high speed image sequences help to record the morphological behaviour of impacting alternative jet fuel drops on the heated surface at different combination of We and T-5 and to arrive at phase diagram highlighting the broad regimes of biofuel drop impact dynamics. For the impact of high We drops, the average normalised spreading velocity increases in film boiling regime whereas it slightly decreases in the cases of un-heated surface, film evaporation, and nucleate boiling. The trend of maximum spread factor, beta(max) with We at different heat transfer regimes is presented. The sensitivity of beta(max) to We depends on the heat transfer regime and is the highest in the film boiling regime. Further the receding dynamics of impacting biofuel drop on the heated surface is significantly influenced by T5. The observed trends are qualitatively explained through a temperature-dependent apparent contact angle in the available theoretical models as well as the presence of vapor flow and associated fingering at the rim of drop lamella. (C) 2017 Elsevier Masson SAS. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER, 23 RUE LINOIS, 75724 PARIS, FRANCE
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Depositing User: Id for Latest eprints
Date Deposited: 13 Oct 2017 04:53
Last Modified: 13 Oct 2017 04:53
URI: http://eprints.iisc.ac.in/id/eprint/58001

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