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Dissipative hydrodynamic oscillators

I.—Marangoni effect and sustained longitudinal waves at the interface of two liquids

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Il Nuovo Cimento D

Summary

The oscillatory motion of a liquid-liquid interface induced by the Marangoni effect,i.e. the variation of surface tension with the concentration of a surfactant, is described as the harmonic oscillation of the surfactant concentration at the interface. Then, at vanishing damping, threshold values and parameter regions for sustainedlongitudinal (Marangoni-Lucassen) waves are given in terms of the transport coefficients of the two liquids.

Riassunto

Si descrive il moto oscillatorio di un interfaccia tra liquido e liquido indotto dall'effetto di Marangoni, cioè la variazione della tensione di superficie con la concentrazione di un tensioattivo nell'interfaccia. Poi si danno, quanto lo smorzamento si attenua, valori di soglia e regioni di parametri per onde longitudinali sostenute (Marangoni-Lucassen) in termini dei coefficienti di trasporto dei due liquidi.

Резюме

Осцилляторное движение границы раздела двух жидкостей, индуцированное эффектом Марангони, т.е. изменением поверхностного натяжения с концентрацией поверхностно-активного вещества, описывается, как гармоническое колебание концентрации поверхностно-активного вещества на границе раздела. Затем при исчезающе малом затухании в терминах транспортных коэффициентов двух жидкостей определяются пороговые значения и область параметров для незатухающих продольных волн (Марангони-Лукасена).

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Velarde, M.G., Chu, X.L. Dissipative hydrodynamic oscillators. Il Nuovo Cimento D 11, 709–716 (1989). https://doi.org/10.1007/BF02451557

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  • DOI: https://doi.org/10.1007/BF02451557

PACS 47.20

PACS 47.25.Qv

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