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Morphological Development of Fuel Droplets after Impacting Biomimetic Structured Surfaces with Different Temperatures
Journal of Bionic Engineering ( IF 4.9 ) Pub Date : 2020-06-24 , DOI: 10.1007/s42235-020-0050-3
Liang Guo , Yuheng Gao , Ningning Cai , Degang Li , Yuying Yan , Wanchen Sun

To improve the controllability for the evaporation process of fuel spray impinging on the cylinder wall, an experimental study on the development of morphological process of different fuel droplets on aluminium alloy surfaces is carried out. The metal surfaces with different wettability are prepared by laser etching and chemical etching for the experiments. In total, three different fuels are tested and compared under different surface temperatures, including diesel, n-butanol and dimethyl carbonate (DMC). The results show that under a lower wall temperature, the surface wettability, viscosity and surface tension of the fuels have significant effects on spreading and rebounding behaviour of the droplets. As the wall temperature rises over the boiling points of the fuel but below its Leidenfrost temperature, the contact angles between the fuels and surfaces are varying according to the surface wettability, boiling point and Leidenfrost temperature of the fuels. When the temperature of the surface exceeds the Leidenfrost temperature of all the fuels, after impacting the surfaces, different fuel droplets tend to have the same development pattern, regardless of the surface wettability. The rebound level is mainly affected by the amount of fuel vapour generated during the wall-hitting process. Viscosity, surface tension and other properties of the fuel have little effect on post-impacting behaviour of the droplet when the wall temperature is higher than the Leidenfrost temperature of the fuel.

中文翻译:

在不同温度下仿生结构化表面撞击后燃料液滴的形态发展

为了提高燃油喷雾撞击汽缸壁的蒸发过程的可控性,对铝合金表面不同燃油滴形态发展过程进行了实验研究。通过激光刻蚀和化学刻蚀制备具有不同润湿性的金属表面用于实验。总共测试了三种不同的燃料,并在不同的表面温度下进行了比较,包括柴油,正丁醇和碳酸二甲酯(DMC)。结果表明,在较低的壁温下,燃料的表面润湿性,粘度和表面张力对液滴的扩散和回弹行为具有显着影响。当壁温上升超过燃料的沸点但低于莱顿弗罗斯特温度时,燃料与表面之间的接触角根据燃料的表面润湿性,沸点和莱顿弗罗斯特温度而变化。当表面温度超过所有燃料的莱顿弗罗斯特温度时,在撞击表面后,无论表面润湿性如何,不同的燃料滴都倾向于具有相同的显影方式。回弹水平主要受壁击过程中产生的燃料蒸气量的影响。当壁温高于燃料的莱顿弗罗斯特温度时,燃料的粘度,表面张力和其他特性对液滴的后碰撞行为影响很小。当表面温度超过所有燃料的莱顿弗罗斯特温度时,在撞击表面后,无论表面润湿性如何,不同的燃料滴都倾向于具有相同的显影方式。回弹水平主要受壁击过程中产生的燃料蒸气量的影响。当壁温高于燃料的莱顿弗罗斯特温度时,燃料的粘度,表面张力和其他特性对液滴的后碰撞行为影响很小。当表面温度超过所有燃料的莱顿弗罗斯特温度时,在撞击表面后,无论表面润湿性如何,不同的燃料滴都倾向于具有相同的显影方式。回弹水平主要受壁击过程中产生的燃料蒸气量的影响。当壁温高于燃料的莱顿弗罗斯特温度时,燃料的粘度,表面张力和其他特性对液滴的后碰撞行为影响很小。
更新日期:2020-06-24
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