界面活性剤水溶液における液膜噴流の分裂過程に関する研究(流体工学,流体機械)

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Atomization characteristics of surfactant aqueous solutions injected from a fan spray nozzle have been clarified. Surfactant solutions generally have unusual properties, that is, surface tension depending on time (dynamic surface tension) and strong stability of a thin liquid sheet such as a soap film. These special effects result from the adsorption of surfactant molecules to newly formed liquid surface. In this study, the influence of the dynamic surface tension and surface stabilizing effect by the surfactant molecules on the liquid sheet atomization was discussed. The dynamic surface tension and surface-stabilizing effect were measured by oscillating jet method and Ross-Miles method, respectively; Ross-Miles method is generally used to estimate the abilities to form and maintain foams. The break-up length of the liquid sheet and wave amplitude inducing break-up were also measured by photography. Test liquids with several surfactant concentrations indicated that increase of surfactant concentration reduced the relaxation time of the dynamic surface tension, expanded the break-up length and amplify the wave amplitude. This means that adsorption of surfactant molecules increases the break-up length regardless of large wave amplitude. To investigate this inconsistency, two test liquids, which were basically ethanol and surfactant solutions, were specially produced so that they have different surface-stabilizing effect with same density, viscosity and surface tension. The break-up length of the surfactant solution became longer than that of the ethanol solution. This indicates that the surface-stabilizing effect by the surfactant molecules suppresses the liquid sheet atomization.
社団法人日本機械学会の論文
2009-12-25

界面活性剤水溶液における液膜噴流の分裂過程に関する研究(流体工学,流体機械)

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