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Rising of gas bubbles in an aqueous medium in presence of surfactants

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Il Nuovo Cimento C

Summary

Experiments based on the direct comparison of the gas-bubble rising times in a surfactant aqueous solution, in respect to those in pure water, give support to the hypothesis that a rising path of many metres is needed to reach the saturation of the adsorption process on bubbles (0.2÷0.3) cm in diameter. A maximum is evidenced in thet/t 0 ratiovs. surfactant concentration at the highest concentrations tested. An explanation, on a qualitative basis, of the appearance of the observed maximum is proposed.

Riassunto

Viene studiata, con metodo differenziale, la variazione della velocità di risalita di bolle gassose in mezzo acquoso contenente tensioattivi. I risultati portano a concludere che la saturazione del processo di adsorbimento per bolle di (0.2÷0.3) cm di diametro richiede percorsi di risalita, in acque marine, di almeno alcuni metri. Si evidenzia la comparsa di un massimo, alle piú alte concentrazioni, nell'andamento dei rapporti dei tempi di risalita. Si avanza l'ipotesi che tale fenomenologia possa essere interpretata, per bolle con numero di Reynolds >1, in base alle proprietà viscoelastiche del film adsorbito sulle bolle stesse.

Резюме

Эксперименты, основанные на прямом сравнении времен образования газовых пузырьков в водных растворах поверхностно-активных веществ по сравнению с временами образования в чистой воде, подтверждают гипотезу, что требуется нуть образования несколько метров, чтобы произошло насыщение процесса поглощения на пузырьках (0.2÷0.3) см в диаметре. Подтверждается максимум отношенияt/t 0 в зависимости от концентрации поверхностно-активного вещества при исследованных высоких концентрациях. Предлагается качественное обьяснение появления наблюденного максимума.

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Authors and Affiliations

  1. Dipartimento di Chimica Organica «U. Schiff», Laboratorio di Chimica-Fisica Tecnica, Via Gino Capponi 9, 50021, Firenze

    G. Loglio, N. Degli Innocenti, U. Tesei & R. Cini

  2. Tianjin Urban Construction College, China

    Wang Qi-Shan

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  1. G. Loglio
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  2. N. Degli Innocenti
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  3. U. Tesei
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  4. R. Cini
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  5. Wang Qi-Shan
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Loglio, G., Innocenti, N.D., Tesei, U. et al. Rising of gas bubbles in an aqueous medium in presence of surfactants. Il Nuovo Cimento C 12, 289–304 (1989). https://doi.org/10.1007/BF02507201

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  • DOI: https://doi.org/10.1007/BF02507201

PACS 92.10

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