Effect of the universal acid-base indicator on the formation of the concentration-dependent diffusion instability

Winter School on Continuous Media Mechanics

Mosheva, E.A.^1 ; Shmyrov, A.V.^1

Institute of Continuous Media Mechanics UB RAS, Acad. Korolev St. 1, Perm

614013, Russia^1

关键词: Acid-base indicators;    Concentration-dependent diffusion;    Hele-Shaw cells;    Mass transfer mechanism;    Miscible liquids;    Pattern formation;    Spatiotemporal characteristics;    Two-layer systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/208/1/012029/pdf
DOI  :  10.1088/1757-899X/208/1/012029

来源: IOP

【 摘 要 】

The effect of the universal acid-base indicator on the pattern formation and mass transfer in a two-layer system composed of two reactive miscible liquids in a vertical Hele-Shaw cell is studied experimentally. The reaction we study is a neutralization one. It turns out that the presence of the indicator leads to a change in the spatio-temporal characteristics of the system and even in the mass transfer mechanism near the reaction front - from diffusive to convective. The conditions, where the universal indicator does not affect the reaction and can be used as a visualizing mean, are reported.