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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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Bibliographic Details
Published in:Energy (Oxford) 2020-08, Vol.205, p.118031, Article 118031
Main Authors: Huang, Xiaoyu, Wang, Jigang, Wang, Yuxin, Qiao, Xinqi, Ju, Dehao, Sun, Chunhua, Zhang, Qibin
Format: Article
Language:English
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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.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2020.118031