レーザースペックル法を用いた液相反応中の不安定流動測定

抄録

Bouyancy instability at the reaction front in acetic acid and sodium hydroxide system has been studied using visualization with adding indicator and laser speckle method. From the particle image velocimetry analysis, it was found that the suitable tracking size and grid size to capture the displacement of laser speckle patterns in this chemical reaction were 101 pixel and 5 pixel, respectively. When the plumes were generated at the reaction front, the positive displacement of the laser speckle patterns were observed because of Rayleigh-Taylor instability. As time elapses, the negative displacement of laseser specke patterns were also observed because of Salt finger convection due to concentration of sodium acetete at the reaction front.