Gaikwad Shashank G, Pandit Aniruddha B
Chemical Engineering Department, University Institute of Chemical Technology, Nathalal Parikh Marg, Matunga, Mumbai 400 019, India.
Chemical Engineering Department, University Institute of Chemical Technology, Nathalal Parikh Marg, Matunga, Mumbai 400 019, India.
Ultrason Sonochem. 2008 Apr;15(4):554-563. doi: 10.1016/j.ultsonch.2007.06.011. Epub 2007 Jul 6.
Ultrasonic emulsification of oil and water was carried out and the effect of irradiation time, irradiation power and physicochemical properties of oil on the dispersed phase volume and dispersed phase droplet size has been studied. The increase in the irradiation time increases the dispersed phase volume while decreases the dispersed phase droplets size. With an increase in the ultrasonic irradiation power, there is an increase in the fraction of volume of the dispersed phase while the droplet size of the dispersed phase decreases. The fractional volume of the dispersed phase increases for the case of groundnut oil-water system while it is low for paraffin (heavy) oil-water system. The droplet size of soyabean oil dispersed in water is found to be small while that of paraffin (heavy) oil is found to be large. These variations could be explained on the basis of varying physicochemical properties of the system, i.e., viscosity of oil and the interfacial tension. During the ultrasonic emulsification, coalescence phenomenon which is only marginal, has been observed, which can be attributed to the collision of small droplets when the droplet concentration increases beyond a certain number and the acoustic streaming strength increases.
进行了油和水的超声乳化实验，研究了辐照时间、辐照功率以及油的物理化学性质对分散相体积和分散相液滴尺寸的影响。辐照时间的增加会使分散相体积增加，同时使分散相液滴尺寸减小。随着超声辐照功率的增加，分散相的体积分数增加，而分散相的液滴尺寸减小。花生油 - 水体系中分散相的体积分数增加，而石蜡（重）油 - 水体系中该体积分数较低。发现分散在水中的大豆油的液滴尺寸较小，而石蜡（重）油的液滴尺寸较大。这些变化可以基于体系不同的物理化学性质来解释，即油的粘度和界面张力。在超声乳化过程中，观察到了仅为边缘性的聚并现象，这可归因于当液滴浓度增加超过一定数量且声流强度增加时小液滴的碰撞。
