Viscous fingering and interface splitting instabilities in air-water-oil systems.

IF 9.4 1区 化学 Q1 CHEMISTRY, PHYSICAL Journal of Colloid and Interface Science Pub Date : 2025-01-17 DOI:10.1016/j.jcis.2025.01.096
Young-Hoon Lee, Jingyi Wang, Ranjani Kannaiyan, Ian D Gates
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Abstract

Hypothesis: Viscous fingering instabilities of air displacing water displacing mineral oil is controlled by the air injection rate. Given the lower viscosity of the water, air would tend to finger through the water and then after it reaches the oil, proceed to finger through the oil.

Experiments: In a radial Hele-Shaw cell, experiments were conducted on air injection into mineral oil and air injection into a volume of water at the center of the cell which in turn is surrounded by mineral oil. The images of the fingers are analyzed to quantify the fingering patterns to compare the behaviours between the two and three phase systems.

Findings: Significantly different fingering patterns occur between the two and three phase systems. When air fingers penetrate the water layer and reach the oil, the air propagates along the interface between water and oil in an interface splitting instability mode resulting in development of more intricate fingering patterns. It was also observed that air fingers penetrate within water fingers that penetrate the oil. In addition, the fingertip moves faster with the presence of water exhibiting a discontinuity of the fingertip velocities across the water and mineral oil regions.

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空气-水-油系统中的粘性指指和界面分裂不稳定性。
假设:气驱水驱矿物油的粘指不稳定性由注气量控制。考虑到水的粘度较低,空气会倾向于穿过水,然后在到达油后,继续穿过油。实验:在径向Hele-Shaw池中进行了向矿物油注入空气和向池中心的水体积注入空气的实验,而水体积又被矿物油包围。对手指图像进行分析,量化指法模式,以比较两相和三相系统之间的行为。研究结果:两相系统和三相系统的指法模式明显不同。当空气指穿过水层到达油层时,空气沿着油水界面以劈裂不稳定模式传播,导致更复杂的指动模式的发展。人们还观察到,空气指穿过水指穿过油。此外,在有水的情况下,指尖的运动速度更快,这表明指尖的速度在水和矿物油区域之间是不连续性的。
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来源期刊
CiteScore
16.10
自引率
7.10%
发文量
2568
审稿时长
2 months
期刊介绍: The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies
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