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Experimental study on evaporation and micro-explosion characteristics of biodiesel/n-propanol blended droplet
The evaporation and micro-explosion characteristics of biodiesel/n-propanol blended droplets at 573, 673 and 773 K ambient temperatures are studied using high-speed backlight imaging technique. The results show that the droplet evaporation is relatively stable at 573 K. However, micro-explosions occ...
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Published in: | Energy (Oxford) 2020-08, Vol.205, p.118031, Article 118031 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The evaporation and micro-explosion characteristics of biodiesel/n-propanol blended droplets at 573, 673 and 773 K ambient temperatures are studied using high-speed backlight imaging technique. The results show that the droplet evaporation is relatively stable at 573 K. However, micro-explosions occur at 673 and 773 K, the micro-explosion intensity increases with ambient temperature. The calculated superheat limit of n-propanol is 490 K. The blended droplet micro-explosion occurrence time is associated with the n-propanol concentration. The lower content of n-propanol, the earlier blended droplet micro-explosion occurs, and vice versa. The micro-explosion intensity and evaporation rate of the blended droplet first increase and then decrease as the n-propanol concentration increases. The micro-explosion delay time of the blended droplet first decreases and then increases with the increase of n-propanol concentration. Interestingly, the micro-explosion intensity, evaporation rate and micro-explosion delay time of droplet all reach the optimum value when the n-propanol concentration is 50%. Moreover, the oil membrane formation mechanisms of the soluble blended droplet with two different blended structures (n-propanol in biodiesel and biodiesel in n-propanol) are proposed.
•Droplet evaporation is stable at 573K, but micro-explosions occur at 673 and 773K•Single and overall micro-explosion intensity are quantitatively characterized.•The micro-explosion of P50BD50 is strongest compared to P25BD75, P75BD25.•The micro-explosion time distribution of blended droplet is discussed at 673 and 773K•The oil membrane formation mechanism of biodiesel/n-propanol droplet is proposed. |
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ISSN: | 0360-5442 1873-6785 |
DOI: | 10.1016/j.energy.2020.118031 |