【摘 要】
：
Surfactant is commonly added to ink or paint as dispersive agents for pigment or dye.The surfactant also interferes with the atomization of the liquid sheet injected from a spray nozzle since it has s
【机 构】
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Department of Mechanical Engineering,Osaka City University,Japan
【出 处】
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13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
Surfactant is commonly added to ink or paint as dispersive agents for pigment or dye.The surfactant also interferes with the atomization of the liquid sheet injected from a spray nozzle since it has stabilizing effect on liquid surface,as soap film.However,the stabilization mechanism of liquid sheets formed with surfactant solutions is not fully understood.To investigate the stabilization mechanism,slight force was applied to the liquid sheet non-invasively,and time variable sheet thickness was measured optically until the rupture of the liquid sheet.The slight force was created using thermo-capillary effect.When the soap film is heated locally with a laser,spatial temperature distribution induces Marangoni force.The Marangoni force pulls the heated spot outward and causes the rupture.We estimated Marangoni force from absorbed heat in the liquid sheet and demonstrated the relation between the time required for the rupture and Marangoni force using aqueous solutions of 1,10 and 25ppm of a typical anionic surfactant,dodecyl sodium sulfate(SDS).Brittle fracture of the soap film is observed by the measurement of sheet thickness.Sheet thickness decreases gradually to about 0.7 [μm] from the initial value of 1 [μm],and then suddenly ruptured in spite of continuous increase of Marangoni force.We also estimated molecular adsorption density of the surfactant at each concentration and investigated the dependency of the measured rupture time on molecular adsorption density.The dependency indicated that stabilizing effect of surfactant grows discontinuously from 0 to 0.03μmol/m2 and increases with the adsorption density linearly above 0.03μmol/m2.
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