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Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol

  1. 1.
    0569767 - ÚCHP 2024 RIV CH eng J - Článek v odborném periodiku
    Krzan, M. - Chattopadhyay, P. - Orvalho, Sandra - Zedníková, Mária
    Effects of N-Alkanol Adsorption on Bubble Acceleration and Local Velocities in Solutions of the Homologous Series from Ethanol to N-Decanol.
    Materials. Roč. 16, č. 5 (2023), č. článku 2125. E-ISSN 1996-1944
    Grant ostatní: NSCP(PL) 2022/45/B/ST8/02058
    Institucionální podpora: RVO:67985858
    Klíčová slova: bubble * adsorption * coverage * alkanols
    Obor OECD: Chemical process engineering
    Impakt faktor: 3.4, rok: 2022
    Způsob publikování: Open access
    https://www.mdpi.com/1996-1944/16/5/2125

    The influence of n-alkanol (C2–C10) water solutions on bubble motion was studied in a wide range of concentrations. Initial bubble acceleration, as well as local, maximal and terminal velocities during motion were studied as a function of motion time. Generally, two types of velocity profiles were observed. For low surface-active alkanols (C2–C4), bubble acceleration and terminal velocities diminished with the increase in solution concentration and adsorption coverage. No maximum velocities were distinguished. The situation is much more complicated for higher surface-active alkanols (C5–C10). In low and medium solution concentrations, bubbles detached from the capillary with acceleration comparable to gravitational acceleration, and profiles of the local velocities showed maxima. The terminal velocity of bubbles decreased with increasing adsorption coverage. The heights and widths of the maximum diminished with increasing solution concentration. Much lower initial acceleration values and no maxima presence were observed in the case of the highest n-alkanol concentrations (C5–C10). Nevertheless, in these solutions, the observed terminal velocities were significantly higher than in the case of bubbles moving in solutions of lower concentration (C2–C4). The observed differences were explained by different states of the adsorption layer in the studied solutions, leading to varying degrees of immobilization of the bubble interface, which generates other hydrodynamic conditions of bubble motion.
    Trvalý link: https://hdl.handle.net/11104/0341101

     
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