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Journal of Flow Visualization and Image Processing

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ISSN Imprimer: 1065-3090

ISSN En ligne: 1940-4336

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CHARACTERISTICS OF SOLIDIFICATION-DRIVEN DOUBLE-DIFFUSIVE LAYERS IN MIXTURES

Volume 27, Numéro 4, 2020, pp. 427-451
DOI: 10.1615/JFlowVisImageProc.2020032771
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RÉSUMÉ

In aqueous mixtures, the double-diffusive convection has the ability to form stepped profiles of temperature and composition in the vertical plane, and it is termed double-diffusive layer (DDL). The DDL typically consists of an alternating convecting layer separated by a high-gradient interface. The total height of a double-diffusive layer is influenced by the Prandtl number, which increases with the composition of the salt. In the present study, the influence of initial composition of ammonium chloride (wt.% NH4Cl) on the thickness of the double-diffusive layers during bottom-cooled solidification is investigated. The formation of double-diffusive layers was observed using a Mach-Zehnder interferometer, which quantified the stepped composition profiles, and full-field composition gradient field in 2D. The convective flows in the double-diffusive layers were captured using particle image velocimetry (PIV). The results revealed the decreasing of the convective layer thickness with increasing initial composition, while the contrary was observed for the thickness of the high-solute gradient interface. The insights are applicable to developing new understanding of the composition distribution in mixing oceanic currents as well as the formation of layered structures in igneous rocks.

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CITÉ PAR
  1. Kumar Virkeshwar, Srivastava Atul, Karagadde Shyamprasad, Role of microstructure and composition on natural convection during ternary alloy solidification, Journal of Fluid Mechanics, 913, 2021. Crossref

  2. Thakur Ila, Karagadde Shyamprasad, Srivastava Atul, Mechanisms leading to the formation of double-diffusive layers during unidirectional solidification of aqueous NH4Cl solution, Physical Review Fluids, 7, 6, 2022. Crossref

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