时间： 1月10日（周一） 15:00——16:30

腾讯会议号：520-652-451

Previous experimental study by Kliakhandler et al. (JFM 429:381-390, 2001) reported three different flow patterns of a liquid film flowing down a vertical cylinder. The film flow is unstable due to the famous Plateau-Rayleigh mechanism, which evolves into organised droplets flow patterns. When the flow rate is high, steadily moving droplets separated by a long-thin film were observed. When the flow rate is reduced, necklace like flow structure was seen. When the flow rate is very small, droplets of multi-scales were observed and complex dynamical interactions between these droplets cause an unsteady flow. However, no previous theoretical model correctly predicted the droplet dynamics in the three regimes. In this talk, I will firstly present how to obtain a dynamically similar solution as the experimental findings and discuss the reasons accounting for poor predictions of liquid film dynamics down a vertical fibre. Then, we solve the Navier-Stokes problem and our results show excellent agreements with the experimental data by Kliakhandler et al.

报告人简介：丁子敬，哈尔滨工业大学能源科学与工程学院教授，先后获得学士学位（2009），中国科学院大学硕士学位（2012），新加坡南洋理工大学博士学位（2016）。曾在剑桥大学应用数学与理论物理系从事流体力学中的优化问题的研究（2017-2020），并于2020年加入哈尔滨工业大学。目前，主要研究方向包括流体界面非线性现象，优化问题和湍流输运规律上界理论等，研究内容获得国家自然科学基金以及海外高层次人才项目的支持。