Title：Splashing of colliding liquid cylinders

Speaker:

Prof. Wouter Mostert

University of Oxford

Time: Dec.28th (Thursday) 10am

Location:B-515，Lee Shau Kee Building of Science and Technology

Abstract:

Many interesting dynamics arise from the collision of two liquid bodies, and their resulting fragmentation into droplets. While worthy of study in themselves, these dynamics also have relevance to processes of interest to science and engineering ranging from inkjet printing to breaking ocean waves. In this presentation, direct numerical simulations will be presented of an idealised splashing process featuring two mutually colliding cylinders of liquid (in an ambient gas), under conditions characterised by a set of dimensionless parameters including the Weber (We) and Ohnesorge (Oh), numbers, as well as characteristics of the initial perturbation. The collision results in the growth of a liquid rim, which destabilises into a set of ligaments which simultaneously fragment and merge, resulting ultimately in a statistical size distribution of small droplets resembling a power law. Some of the central dynamics and scaling behaviours of the problem will be discussed, before concluding with potential interpretations and applications to breaking ocean waves in particular.

Bio:

Wouter Mostert is an Associate Professor of Engineering Science at the University of Oxford and Tutorial Fellow at Worcester College, Oxford. His research interests are in multiphase flow physics, especially with reference to air-sea interaction problems involving flux of mass, momentum and energy due to breaking ocean waves. He is further interested in the effects of ocean wave systems on sediment and pollutant transport, along with better understanding wave loadings on civil infrastructure. He was previously an Assistant Professor at the Missouri University of Science and Technology in the USA, and has held postdoctoral appointments at Princeton and Caltech. He obtained his PhD from the University of Queensland in 2015.

供稿：隋然课题组

审核：刘有晟、游小清