The spontaneous spreading of drops has been studied a lot for the last many decades in presence of air. On the other hand, there exist only a handful of studies to describe the spreading of liquid drop on a substrate kept submerged in another viscous liquid, instead of its relevance in manifold applications ranging from oil recovery to design appropriate marine surfaces, to droplet microfluidics. In this talk I will discuss the dynamic contact angle correlations for numeric modelling of under liquid drop spreading and their validation against experiments.

Another part of the talk will focus on the impact of drops on superhydrophobic surfaces. Such surfaces show different natures of the impact force acting on the substrate which is crucial for maintaining its characteristics. Here, the energy budget analysis and dynamic evolution of impact force will be discussed.

Dr Parmod Kumar

Dr Parmod Kumar is an Assistant Professor in the School of Engineering at the Indian Institute of Technology Mandi, India. He also worked as faculty in the Department of Mechanical Engineering at the National Institute of Technology Hamirpur, India prior to joining IIT Mandi. He did his PhD from the Department of Mechanical and Industrial Engineering, IIT Roorkee, India. His research expertise is in Interfacial Flows, Entrainment Dynamics, Computational Fluid Dynamics, and Probes and Instrumentation for Two-phase Flows. Presently, he is working on sponsored projects in the area of mitigation of pressure oscillations in direct contact condensation.