Abstract
The evidence was studied that the chemical wave accompanied by hydrodynamic instability showed some noteworthy characteristics in a quasi-two-dimensional shallow layer of the unstirred excitable Belousov–Zhabotinsky (BZ) reaction. This chemical wave has been known as the "Big Wave" or the "Hydrochemical Soliton", which showed soliton-like properties. We clarified properties of the wave using an optical technique (Mach–Zehnder interferometry). The Big Wave acceleratingly propagated with large velocity, and simultaneously caused flow in the bulk of the solution as well as large surface deformation (~ 5μm). We proposed that the main mechanism of this wave was chemically coupled Marangoni instability, which was induced by the gradient of surface tension due to the thermal and/or material inhomogeneity in the BZ solution.
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