Topics on bubble dynamics, gastropod locomotion and buoyant vortex rings

Javier Rodríguez Rodríguez (Fluid Mechanics Research Group, Universidad Carlos III)

Location: Aula 118, ETSEQ
Start time: April 5, 2013, 12 p.m.

Abstract

In this talk we will cover a number of topics relative to three different research lines of the GMF/UC3M. The first part of the seminar will be about the dynamics of microbubbles, in particular we will explore the conditions that a bubble cloud must fulfill in order to use the dependency of its resonance frequency on the ambient pressure to measure, using non-invasive techniques, that pressure. Also, we will report on new mathematical solutions to accurately describe the transport of these microbubbles by means of an ultrasound wave.
We will continue with some experimental and theoretical investigation on the locomotion of terrestrial gastropods. We will characterize experimentally the complex kinematics of the gastropod’s foot and, using this information, we will formulate a simple model based on lubrication theory that allows us to understand how the snail moves. In particular, we will discuss the role played by the rheological properties of the mucus.
And finally, we will show some experimental results on the formation of vortex rings in negatively buoyant starting jets. We will identify different formation regimes as a function of a buoyancy parameter (either a Froude or Richardson number). In the regimes where a vortex is formed, we will formulate phenomenological models to quantify its velocity and circulation.

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About Javier Rodríguez Rodríguez

Institution: Fluid Mechanics Research Group, Universidad Carlos III

Javier Rodríguez Rodríguez received his degree in Aerospace Engineering (6 year programme) at the School of Aeronautics of the Polytechnic University of Madrid in the year 2000. During his time in college he collaborated as a research assistant with the Microgravity Institute “Ignacio da Riva” in the design of attitude control algorithms for small satellites. After finishing his studies he moved as a teaching assistant to Carlos III University, where he got his PhD in Fluid Mechanics in 2004 under supervision of Prof. Carlos Martínez-Bazán. His thesis research concerned the breakup of gas bubbles in a turbulent jet.

In january 2005 he moved to the University of California at San Diego to work as a postdoctoral researcher in the team of Prof. Juan C. Lasheras. During that period, although he continued working on bubbly turbulent flows, he turned his interest towards the applications of fluid mechanics to biology and medicine. He had the opportunity of working in several problems of biofluid mechanics: cell locomotion, hemodynamics of intracraneal aneurysms or microbubble interaction with ultrasounds, among others.

In october 2006 he got his current position as an assistant professor at the Fluid Mechanics Group of Carlos III University of Madrid.

His research interests include bubbly turbulent flows; waves; starting jets & vortex rings; biofluid mechanics: hemodynamics, ultrasound interaction with microbbubles (Ultrasound Contrast Agents), viscous locomotion of gastropods & cell mechanics.

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