标题： 实验和可混液体滴不同粘度二元碰撞的直接数值模拟 显示英文标题

标题： Experiments and Direct Numerical Simulations of binary collisions of miscible liquid droplets with different viscosities

摘要： 二元液滴碰撞在各种实际应用中具有重要意义，包括分散的两相流动。 我们的研究背景是预测喷雾过程中形成的颗粒产品的特性。 为了更深入地了解喷雾中的基本子过程，使用实验和直接数值模拟进行二元液滴碰撞研究。 这些研究的目的是开发用于液滴碰撞结果的半解析描述。 然后可以将这些碰撞模型用作尺度缩减模拟的闭合项。 在本工作中，我们关注不同液体的液滴碰撞。 这种类型的碰撞发生在喷雾干燥过程中，当含有不同固体含量的液滴在循环区域碰撞时发生。 已经开发出一种新的实验方法，可以通过激光诱导荧光实现高空间和时间分辨率的记录。 所提出方法获得的结果将与DNS模拟进行比较。 液滴的粘度不同，而界面张力和密度相等。 液体是可混溶的，两种液体之间没有表面张力作用。 我们的目的是发现由液滴粘度比引起的基本现象。 显示英文摘要

摘要： Binary droplet collisions are of importance in a variety of practical applications comprising dispersed two-phase flows. The background of our research is the prediction of properties of particulate products formed in spray processes. To gain a more thorough understanding of the elementary sub-processes inside a spray, experiments and direct numerical simulations of binary droplet collisions are used. The aim of these investigations is to develop semi-analytical descriptions for the outcome of droplet collisions. Such collision models can then be employed as closure terms for scale-reduced simulations. In the present work we focus on the collision of droplets of different liquids. These kinds of collisions take place in every spray drying process when droplets with different solids contents collide in recirculation zones. A new experimental method has been developed allowing for high spatial and time resolved recordings via Laser-induced fluorescence. The results obtained with the proposed method will be compared with DNS simulations. The viscosities of the droplets are different whereas the interfacial tension and density are equal. The liquids are miscible and no surface tension is acting between the two liquids. Our intention is to discover elementary phenomena caused by the viscosity ratio of the droplets.