title: Hot spots revealed by simultaneous experimental measurement of the two-dimensional concentration and temperature fields of an exothermic chemical front during finger-pattern formation.
abstract: A noninvasive optical technique combining digital interferometry in transmission and transparency measurement of concentration is developed to analyze spatiotemporal dynamics of physicochemical systems. This technique allows one to measure simultaneously the two-dimensional (2D) dynamics of concentration and temperature fields in both reactive and nonreactive systems contained inside a transparent cell. When used to experimentally analyze buoyancy-driven fingering of an exothermic autocatalytic chemical front, this method reveals in the 2D temperature field the presence of hot spots where the temperature locally exceeds the adiabatic one.
authors.affiliation: Microgravity Research Center, Chimie Physique E.P. CP 165/62, Université Libre de Bruxelles (ULB), Avenue F.D. Roosevelt 50, 1050 Brussels, Belgium. pgrosfi@ulb.ac.be
authors.forename: P
authors.initials: P
authors.lastname: Grosfils
authors.forename: F
authors.initials: F
authors.lastname: Dubois
authors.forename: C
authors.initials: C
authors.lastname: Yourassowsky
authors.forename: A
authors.initials: A
authors.lastname: De Wit