Autoignition Behavior of an Ethanol-Methylcellulose Gel Droplet in a Hot Environment

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Autoignition of an ethanol-based gel droplet was experimentally investigated by adding 10 wt % of methylcellulose as gellant to liquid ethanol. Experimental studies of the ignition behavior of the gel droplet were found to be quite rare. The initial droplet diameter was 1.17 +/- 0.23 mm. The gel droplet was suspended on a K-type thermocouple and its evaporation, ignition and combustion characteristics were evaluated and compared with pure ethanol at an ambient temperature of 600, 700, and 800 degrees C under atmospheric pressure conditions. The gel droplet exhibited swelling and vapor jetting phenomena. Before ignition, a linear decrease in droplet diameter followed by a sudden increase was repeatedly observed, which was caused by evaporation and swelling processes, respectively. Major droplet swelling was detected just before the onset of ignition at all temperatures. But no further swelling was detected after ignition. For the gel droplet, the ignition delay accounted for 93% of the droplet lifetime at 600 degrees C, and 88% at 700 degrees C, but only 31% at 800 degrees C. Its average burning rate was also evaluated for all temperatures. At 800 degrees C, the gellant layer no longer exerts any influence on the combustion of the gel droplet.
Publisher
MDPI
Issue Date
2018-08
Language
English
Article Type
Article
Citation

ENERGIES, v.11, no.8

ISSN
1996-1073
DOI
10.3390/en11082168
URI
http://hdl.handle.net/10203/246723
Appears in Collection
AE-Journal Papers(저널논문)
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