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Study of chemoconvection by PIV at neutralization reaction under normal and modulated gravity

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Abstract

An experimental investigation of chemically triggered convection is carried out. A two-layer system of miscible reactive fluids—the neutralization reaction between an acid and a base—is considered in a vertical Hele-Shaw cell. This system is subject to the action of gravity and vertical translational vibrations (modulated gravity). During the reaction, a less dense salt solution emerges in the reaction zone, thus triggering the buoyancy-driven convection in the form of concentration plumes rising in the upper layer. The particle image velocimetry is used as the method of study. The considered system is non-stationary, and a technique is developed for the processing of a long series of images registered during experiments. The evolution of the flow structures and of the convection intensity is analyzed. In the considered range of experimental parameters the vibrations slightly slow down the convection.

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Funding

The work was financially supported by the Russian Science Foundation (Grant 19-11-00133).

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Authors and Affiliations

  1. Department of Applied Physics, Perm National Research Polytechnic University, 614990, Perm, Russia

    Elena Mosheva & Nikolai Kozlov

  2. Institute of Continuous Media Mechanics UB RAS (Perm Federal Research Center UB RAS), 614013, Perm, Russia

    Elena Mosheva & Nikolai Kozlov

Authors
  1. Elena Mosheva
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  2. Nikolai Kozlov
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Correspondence to Nikolai Kozlov.

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Mosheva, E., Kozlov, N. Study of chemoconvection by PIV at neutralization reaction under normal and modulated gravity. Exp Fluids 62, 10 (2021). https://doi.org/10.1007/s00348-020-03097-0

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