Effect of the oxidation surface on dynamic behavior of water droplet impacting on the molten tin

• Published in: European journal of mechanics, B, Fluids B, Fluids, 2019-09, Vol.77, p.25-31
• Main Authors: Lin, Dong, Wang, ChangJian, Chen, Bing, Li, ManHou, Shen, Zhihe
• Format: Article
• Language: English
• Subjects: Molten tin; Oxidation layer; Transverse diameter; Vapor explosion; Water droplet; Weber number
• ISSN: 0997-7546; 1873-7390
• DOI: 10.1016/j.euromechflu.2019.02.002

A series of experiments were carried out on water droplet impacting on the molten tin surface using a high speed camera. The falling height of water droplet ranges from 10 to 90 cm, and the oxidation layer thickness effect was taken into account by varying the oxidation time of the molten tin. The results show the Weber number and the oxidation time have significant effect on the droplet impact behavior. Three typical phenomena can be observed: Droplet breakup, Bubble and Crown. For the lower Weber number, more than one phenomenon occurs even for the same Weber number and oxidation time. For the Weber number higher than 800, only crown phenomenon appears. The formation of the oxidation layer causes the probability of vapor explosion to decrease, but the intensity of vapor explosion increases with the oxidation time. With the increase in the Weber number and the oxidation time, the maximum crown width and height increase, which implies that the vapor explosion is more violent The correlations of the maximum crown height and width as a function of the Weber number were proposed for specified oxidation time. •Three typical phenomena of droplet breakup, bubble and crown were observed.•The increase in the Weber number leads to the more violent vapor explosion.•The phenomenon randomness was found for low Weber number.•The oxidation layer significantly affects the vapor explosion intensity.•The correlations of the maximum crown height and width were proposed.