Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Pattern Formation / Reaction-Diffusion I
DY 24.4: Vortrag
Dienstag, 21. März 2017, 15:15–15:30, ZEU 147
Hydrodynamic instabilities driven by complex chemical reactions — •Dario M. Escala1, Jorge Carballido-Landeira1, Anne DeWit2, and Alberto P. Munuzuri1 — 1Nonlinear Physics Group, Univ. of Santiago de Compostela, Spain — 2Nonlinear Physical Chemistry Unit, Univ. Libre de 6 Bruxelles (ULB), Belgium
Classical hydrodynamic instabilities in Hele-Shaw cells (like those produced by buoyancy or differences in viscosity) have been extensively studied during decades. The potential applications have aroused major interest in a variety of research fields with the aim of understanding the physics behind it and thus, find ways to control and model these systems. During the past years, researchers have increased the complexity of these investigations proposing interesting couplings between hydrodynamic instabilities and chemical systems. From simple neutralization reactions to more complicated autocatalytic reactions, a broad horizon has been opened where these coupled systems were also extensively analyzed and modeled seeking the description of new instabilities. Here, two setups will be analyzed that clearly demonstrate the constructive role played by the coupling of chemical and hydrodynamic instabilities. First, buoyancy-driven instability is generated due to the oscillatory Belousov-Zhabotinsky reaction. Second, a pH-shifting reaction which produces a new type of viscous finger instability. In both cases, the control parameters are varied. We use advanced optics techniques and numerical simulations as a complementary source of information in order to unveil the mechanisms underlying behind the observed phenomena.