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采用静电雾化方法进行了W/O玉米油乳化液制备的实验研究,在雾化流量2.8～15mL/min、电极施加电压5.2～11kV的条件下,用Winner99颗粒图像测试仪测试了所制乳化液的离散相滴径,分析了施加电压及雾化流量对平均滴径及滴径分布的影响.结果表明,静电雾化法可制备离散相滴径比搅拌法更均匀的乳化液,离散液滴平均滴径约为28μm且绝大多数液滴直径为20～40μm,其稳定性明显优于搅拌法所制乳化液.乳化液离散相滴径与施加电压及雾化流量密切相关,电压增大、雾化电流增大,乳化液离散相滴径急剧减小,滴径分布变窄.流量增大,单位时间内液滴携带及输运的电量增大,故雾化电流增大;但液滴荷积比随流量增大而减小,故滴径变大,滴径分布变宽.高电压、低流量有助于获得稳定性更好的乳化液.
The experimental research on the preparation of W / O corn oil emulsion by electrostatic atomization method was carried out. The emulsification of the W / O corn oil emulsion was tested with Winner99 particle image tester under the conditions of atomization flow rate of 2.8-15mL / min and electrode voltage of 5.2-11kV. Liquid droplet diameter, the effects of applied voltage and atomized flow on the average droplet diameter and droplet diameter distribution were analyzed.The results showed that the emulsion droplet with dispersed droplet diameter more uniform than the stirring method can be prepared by electrostatic atomization method, The average droplet diameter is about 28μm and the diameter of most droplets is 20 ~ 40μm, the stability is better than that of the emulsion prepared by the stirring method.The droplet size of emulsion dispersed phase is closely related to the applied voltage and the atomization flux, The atomization current increases and the droplet diameter of the dispersed phase of the emulsion decreases sharply and the droplet diameter distribution becomes narrower.The flow rate increases and the amount of electric power carried and transported by the droplet per unit time increases and the atomization current increases The droplet charge-to-volume ratio decreases as the flow rate increases, so the droplet diameter becomes larger and the droplet diameter distribution broadens.High voltage and low flow rate help to obtain a more stable emulsion.