论文部分内容阅读
电场作用下荷电多相反应系统在强化传质和相间作用方面具有显著的优势,有利于克服酯交换反应制备生物柴油过程中两相互溶性差的问题.本文基于显微高速摄像技术对油相中乙醇荷电破碎行为的演变过程进行了可视化研究,精确捕捉了不同毛细管口场强下荷电乙醇液滴破碎的显微形貌特征,探讨了电场强度影响下破碎模式的演变规律.实验结果表明,随着毛细管口电场强度的增加,醇在油相中的荷电雾化依次经历了滴状模式、单滴破碎模式、枝杈状破碎模式及膜状破碎模式,且生成液滴的尺寸逐渐减小.膜状破碎模式下,形成大量微小液滴,可快速实现油醇两相的混合,为酯交换反应过程提供一种有利的反应环境.“,”under high electric field intensity,charged multiphase reaction systems have dominant advantages in enhancing mass transfer and phase interaction which can overcome the poor solubility of two phases in the process of biodiesel production by transesterification.By means of high-speed microscopy,visualization on the evolution process of charged ethanol dispersion in oil has been reported.Microphotograph characters of charged ethanol are accurately captured and regulation evolution of breakup models is discussed under different electric field intensity at capillary tip.The results show that the breakup models of ethanol in oil experience the following models in turns:single droplet model,single droplet breakup model,branch breakup model and membrane breakup model.In membrane breakup model,the droplet sizes were very small,achieving well mixing of oil and alcohol,which supplied a good reaction environment for transesterification reaction.