磁强化旋流场内功能化磁性纳米粒子对液滴群演化的调控机制

海洋石油开发的经济和战略意义重大。目前油水旋流分离技术已应用于高含水采出液预处理和污水处理中，但面临着采出液乳化等问题。磁强化旋流分离技术开始引起关注。该种技术的磁种已达到液滴尺度，如采用功能化磁性纳米粒子（Magnetic Nanoparticles, MNP）作为磁种，可兼具表面活性剂作用，优化处理效果。然而磁强化旋流场中功能化MNP对液滴群演化的调控机制尚不明确，使该种技术遇到挑战。前期研究中，申请人发现了旋流场液滴粒径变化和迁移运动规律。本项目拟基于前期工作，研究磁强化旋流场中功能化MNP调控下的液滴群粒径变化规律、液滴群迁移规律。研究将构建机理模型，通过实验观测液滴群粒径分布和相含率变化，结合数值模拟，封闭和验证模型，揭示磁强化旋流场中功能化MNP对液滴群粒径分布动态平衡的调控机制、对液滴群运动响应的调控机理。从而为该种新型磁强化旋流分离技术提供机理解释，指导设备研发。

The economic and strategic implications of offshore oil development are significant. Cyclone separation technology has been applied in the pretreatment of produced fluid with high water content and sewage generated during offshore production. However, emulsification of the produced fluid is among some of the limitations of the technology. Thus, magnetically enhanced cyclone separation technology has begun to garner attention. The magnetic seed size is within the droplet diameter range. If functional magnetic nanoparticles (MNPs) are applied as magnetic seeds, they can also act as surfactants. This would improve the treatment effect. However, the regulation mechanism of functional MNPs on the droplet population evolution in the magnetically intensified swirling flow field is still unknown, which poses a challenge to this technology. Our previous research discovered the size distribution variation law and the migratory regularity of the droplet population. Based on our previous work, this study will investigate the size variation law and the migration regularity of the droplet population regulated by the functional MNPs in the magnetically intensified swirling flow field. In this study, we will propose theoretical models. The models will be enclosed and validated by measuring the droplet size distribution and volume fraction variance through a flow experiment, and by a numerical simulation. Consequently, the regulation mechanism of the droplet population size distribution balance, and motion response of the droplet population, by the functional MNPs can be identified. The findings of this research will provide an explanation for the mechanism of this novel magnetically intensified cyclone separation technology, and provide guidance for design of the equipment.