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A study on daughter droplets formation in bitumen/glass/water contact line displacement due to instability

机译：沥青/玻璃/水接触线不稳引起子滴形成的研究

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Experiments were performed to study the displacement of a rectangular strip bitumen, coated on a glass plate, in the presence of water at different pH and temperature. During the displacement, modulated structure formed at the bitumen/water/glass contact line and ridge-like structure formed at the bitumen/water interface. The modulated and ridge structures formed due to the contact line and the free surface instabilities. These instabilities grew further, which led to the formation of daughter droplets. On the contrary, circular bitumen disk displaced uniformly in the inward radial direction to form single droplet in the presence of water. The number of daughter droplets formed increases with the decrease in the width of the bitumen strip for a constant strip length. It was observed that the number of daughter droplets increases with the increase in pH and temperature of water. The observed growth of instability and the experimental results were compared with the instability analyses on dewetting process available in the literature. It is recommended that a non-symmetrical shape of bitumen film on sand grain may be detrimental to bitumen separation in an oil sand extraction unit.
机译：进行实验以研究在不同pH和温度的水存在下，涂在玻璃板上的矩形条状沥青的位移。在位移过程中，在沥青/水/玻璃接触线处形成调制结构，并在沥青/水界面处形成山脊状结构。由于接触线和自由表面的不稳定性而形成调制和脊结构。这些不稳定性进一步增加，导致形成子液滴。相反，在有水的情况下，圆形沥青盘沿径向向内均匀移动以形成单个液滴。对于恒定的条带长度，所形成的子液滴的数量随着沥青条带的宽度的减小而增加。观察到随着水的pH值和温度的增加，子液滴的数量增加。将观察到的不稳定性增长和实验结果与文献中可用的对润湿过程的不稳定性分析进行了比较。建议砂粒上沥青膜的形状不对称，这可能不利于油砂提取装置中的沥青分离。

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