RT Journal Article ID 7794b34c5509c0f7 A1 Beaumont, Fabien A1 Liger-Belair, Gerard A1 Polidori, Guillaume T1 INSTABILITIES AND TOPOLOGICAL BEHAVIOR OF FLOW INSIDE CHAMPAGNE GLASSES JF Journal of Flow Visualization and Image Processing JO JFV YR 2015 FD 2016-09-14 VO 22 IS 1-3 SP 97 OP 115 K1 champagne K1 laser tomography K1 PIV K1 flows topology K1 vortex flow K1 two-phase flow AB The glass shape and especially its open aperture is suspected to play an important role as concerns the kinetics of CO2 and flavor release during champagne tasting. In recent years, much interest has been devoted to depicting each and every parameter involved in the release of gaseous CO2 from glasses poured with champagne. However, one can hardly understand the bubbling and aromatic exhalation events in champagne tasting, without studying the flow-mixing mechanisms inside the glass. Indeed, a key assumption is that a link of causality may exist between the flow structures created in the wine due to bubble motion and the process of flavor exhalation. In this article, a collection of various ascending bubble-driven flow patterns and mixing phenomena that illustrate the fine interplay between ascending bubbles and the fluid around are evidenced through tomography techniques. Moreover, the particle image velocimetry (PIV) technique was used in order to reach the velocity field of the ascending bubbles-driven flow patterns found in a flute poured with champagne. The results show that the continuous flow of ascending bubbles strongly modifies the mixing and convection conditions of the liquid medium. Moreover, spontaneous and self-organized convective cells were evidenced at the air/champagne interface through laser tomography. The number, size, and velocity of the multiple and self-organized convective cells vary as time proceeds with the continuously decreasing bubble-driven champagne flow. We can establish a close link between the number of hydrodynamic instabilities evidenced at the air/champagne interface and the bubble flow rate. PB Begell House LK https://www.dl.begellhouse.com/journals/52b74bd3689ab10b,5aaeeb497b41ed62,7794b34c5509c0f7.html