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Biodiesel droplet combustion

Lam S. C. A., Sobiesiak A.

Journal of KONES

2006

Vol. 13, No. 2

267-274

An experimental setup was assembled to test droplets of biodiesel as well as ultra-low sulfur diesel, and ethanol for their adherence to the diameter-squared linear relationship. The droplets’ burning rate constants and temperature histories are reported. Apparatus for determining droplet diameter, thermocouple arrangement for droplet temperature history acquisition, illustrates a series of frames from a high-speed movie capturing the entire biodiesel burning sequence, changes of droplet diameter-squared over time and temperature history for biodiesel, ultra-low sulfur diesel and, ethanol biodiesel droplet, ethanol are introduced in the paper. Results comprise three stages warm-up and combustion, combustion of the droplet with the liquid phase boiling and burn-off of vaporized fuel. For larger diameter droplets, that period could occupy significant fraction of the droplet’s lifetime. The second stage is where the droplet has reached its boiling temperature and in general, all the fuels tested adhere to the D2 relationship. The biodiesel and diesel deviated slightly as a result of their multi-component nature.