Experimental studies on the instabilities of viscous fingering in a Hele-Shaw cell |
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Authors: | Chung Gi Baig Young Ho Chun Eun Su Cho Chang Kyun Choi |
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Affiliation: | (1) School of Chemical Engineering, Seoul National University, 151-742 Seoul, Korea;(2) R&D Center, Kumho Chemicals, Inc., 467-810 Kyunggi-do, Korea |
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Abstract: | When air is injected into silicone oil contained in a horizontal Hele-Shaw cell, a single air bubble forms and grows showing
various interesting phenomena. In this study the effects of the bubble front velocity, air injection velocity at a nozzle,
fluid properties and cell depth on the stability of the growing bubble were investigated experimentally. By using the modified
capillary number involving the aspect ratio, we obtained the onset conditions of the unstable bubble. Also, the bubble width
was analyzed both quantitatively and qualitatively. Before the bubble experiences splitting, the bubble front velocity is
almost proportional to the air injection velocity. Therefore the latter velocity may be used in a practical sense. |
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Keywords: | Air Injection Velocity Bubble Front Velocity Bubble Width Capillary Number Hele-Shaw Cell |
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