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PDF(1429 KB)
水击谐波条件下乳化油液滴积聚过程影响因素初探
Factors affecting the accumulation of emulsified oil droplets by water hammer harmonics
根据乳化油液滴的形成过程和其运动状态的特点，选择和控制适宜的破乳条件促进乳化液滴的积聚，可以实现乳化油液的有效破乳。通过对W/O型乳化油液滴在水击谐波场力作用下的过程进行分析，发现在水击谐波波节的±λ/4范围内，分散相液滴经过一定的时间发生了积聚，但影响分散相液滴相互聚集的因素多且又复杂。通过由理论分析和试验结果初步确定了乳化油液滴积聚过程的主要影响因素，其中随着水击谐波频率、油液速度的增大，积聚过程加快，控制在水击谐波频率为10Hz条件下，液滴积聚效果较佳。而随着连续物相的黏度系数增大，液滴积聚的时间增加，积聚过程反而降低，控制连续相的黏度系数在1.0×10-3 Pa·s左右，液滴积聚效果较为理想；同时发现乳化油液滴粒径的大小对积聚过程也产生一定的影响，因此积聚过程不能忽略乳化油液滴惯性力的作用。控制好合适的物性参数可以实现分散相液滴的积聚和聚结，为深入研究乳化油液的水击谐波破乳脱水奠定基础。
Based on the characteristics of the formation process and their state of motion, emulsified oil droplets can be demulsified effectively by choice of suitable conditions. Dispersed W/O (water/oil) emulsified oil droplets can accumulate after a certain period of time under a water hammer harmonic with a wavelength range of ±λ/4. However, the effect of different factors on the accumulation of the dispersed droplets is very complex. Through theoretical modeling and experimental results, in this study we analyze the factors affecting the accumulation of emulsified oil droplets. The accumulation of emulsified oil droplets increases with increasing fluid velocity of oil and water hammer harmonic frequency, and the droplet accumulation effect is optimized for a water hammer harmonic frequency of 10Hz. The accumulation of emulsified oil droplets decreases with increasing coefficient of viscosity of the continuous phase, and droplet accumulation effect is optimized when the continuous viscosity coefficient is 1.0×10-3Pa·s. We found that the size of the emulsified oil droplet has an impact on the accumulation process, and therefore the inertial force of the emulsified oil droplets cannot be ignored. Dispersed droplets can be induced to accumulate and coalesce by controlling the appropriate physical parameters. This work provides a reference basis for the demulsification and dehydration of emulsified oil using a water hammer harmonic.
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