Abstract
The present experiment is conducted to examine density-driven instabilities between reactive fluid layers in a vertical Hele-Shaw cell. The upper and lower layers contain HCl and NaOH solutions, respectively. The former is heavier than the latter, and the system is gravitationally stable. We observe the dynamical evolution of interface for several concentrations using a flow visualized technic. It is found that small ripples appear on the moving reactive interface. The reason for this is due to density-driven instabilities resulting from the productions by chemical reaction on the interface.
