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Institute of Global Innovation Research

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Event

【GIR Open Seminar】 Dr. Christophe Almarcha

Date 2019.8.13 (13 : 30 - 14:30)
Venue Lecture Room L0031, Lecture Hall Building for the Faculty of Engineering, Koganei Campus, TUAT
Speaker / Topic Dr. Christophe Almarcha (Aix Marseille University, France)
"Dynamics of a reactive gaseous interface: Use of complex poles to describe the nonlinear evolution"

〈Abstract〉
A premixed flame is a sub-millimeter interface through which a mixture of reacting gas is transforming into burned gas with an increase in temperature and molar volume by a factor 8. This is due to the global exothermicity of hundreds of chemical reactions at play. The gas expansion at the reactive interface induces hydrodynamical instabilities that are wrinkling the interface in a complex dynamics. Some cells are forming and merging in a fashion similar to bubbles in Rayleigh-Taylor instability. However, contrary to that instability, the propagation of the flame induces a limitation of the wrinkling amplitude and it is then possible to describe the evolution of the interface with a PDE equation: the Michelson-Sivashinsky equation. Moreover some analytical solutions consisting of pole trajectories in the complex plane are capable of describing all the dynamics, even in the fully nonlinear regime. This is what we demonstrate experimentally in a quasi-2D burner.


Language English
Intended for Everyone is welcome to attend.
Co-Organized by Institute of Global Innovation “Life Science” Tagawa Team
Excellent Leader Development for Super Smart Society by New Industry Creation and Diversity
TUAT President’s Discretion Invitational Fellowships for Research in Japan
Outline
Contact Institute of Global Innovation Research, Institute of Engineering,
Assoc. Prof. Yuichiro Nagatsu
Email: nagatsu (at) cc.tuat.ac.jp

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