论文标题
液滴冲击动力学对Janus纹理加热的底物
Droplet impact dynamics on Janus-textured heated substrates
论文作者
论文摘要
在本文中，通过使用热晶格玻尔兹曼方法，研究液滴对janus纹理加热底物的动态行为是数值研究的。详细研究了几种因素，例如润湿性，jakob数和韦伯数对液滴影响动态行为的影响。仿真结果显示了三种类型的沸腾状态，即接触沸腾，过渡沸腾和膜沸腾。接触沸腾状态的液滴定向向密度较差的区域迁移，而液滴向较低的Weber数量朝着薄膜沸腾状态移动，这与实验中液滴运动的方向一致[Zhang等，adv。功能。 Mater。，2019，29，1904535]。 janus纹理加热的底物上的自露液液滴具有不平衡的年轻人的前端，蒸气压差和热态力。此外，具有低润湿性的Janus纹理表面具有优质的成核行为，从而使其通常从高效的过渡沸腾状态到效率低下的薄膜沸腾状态，它们通常很容易过渡。此外，液滴的沸腾状态从接触状态变为过渡沸腾状态，然后随着jakob数量的增加而变为薄膜沸腾状态。
In this paper, the droplet impact dynamic behavior of droplet on Janus-textured heated substrates is numerically investigate by using the thermal Lattice Boltzmann method. The effect of several factors like the wettability, the Jakob number and the Weber number on the droplet impact dynamic behavior on Janus-textured heated surface are studied in detail. The simulation results show three types of boiling states, i.e., contact boiling, transition boiling and film boiling. The droplets in contact boiling state directionally migrate toward the denser region, while the droplets move toward the sparser region for film boiling state at low Weber number, which agrees with the direction of droplet motion in experiments [Zhang et al., Adv. Funct. Mater., 2019, 29, 1904535]. The self-propelled droplets on the Janus-textured heated substrates is owning to unbalanced Young's fore, vapor pressure difference and thermophoretic force. Moreover, The Janus-textured surface with low wettability has superior nucleation behavior resulting in their typically easy transition from efficient transition boiling state to inefficient film boiling state. In addition, the boiling states of the droplet change from the contact boiling state to the transition boiling state and then to the film boiling state as the Jakob number increases.
