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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/759

Title: A study on daughter droplets formation in bitumen/glass/water contact line displacement due to instability
Authors: Basu, S
Nandakumar, K
Masliyah, J H
Keywords: Oil sand extraction
Bitumen displacement
Contact line instability
Free surface instability
Dynamic contact angle
Equilibrium contact angle
Issue Date: 2000
Citation: Fuel, 79(7), 837–841
Abstract: 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 with the decrease in the width of the bitumen strip for a constant strip length. It was observed that the number of daughter droplets 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.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/759
Appears in Collections:Chemical Engineering

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