Abstract
This study provides a theoretical analysis of how time-dependent injection strategies affect the development of viscous fingering in a miscible finite slice. We are specifically examining a sinusoidal injection, which is characterized by its amplitude (\(\Gamma\)) and periodicity (T). This study presents two case studies: injection-extraction (\(\Gamma >0\)) and extraction-injection (\(\Gamma <0\)), which have been examined for different values of T. The extraction-injection process demonstrates that diffusion plays a prominent role, leading to a notable delay in the interaction between stable and unstable interfaces. In the injection-extraction case, the onset of fingers does not change with an increase in T, whereas the onset gets delayed in the case of extraction-injection in a nearly linear fashion as the time period increases. Additionally, by quantifying the impact of convective forces on the time-dependent injection strategy, we can gain a deeper understanding of the underlying physical mechanism responsible for the observed delay in onset at higher T values. The delayed onset of instability will have a positive impact on the separation of chemicals in chromatographic applications.
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The author thanks Dr. Surfarazhussain S. Halkarni and Dr. Tapan Kumar Hota for various fruitful discussions and acknowledges the financial support from SRM University-AP and the computational support from the Department of Science and Technology, Government of India (Grant No.: SRG/2020/000713).
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Zahid, S. Study of viscous fingering of a finite slice using time-dependent strategies. Int J Adv Eng Sci Appl Math (2023). https://doi.org/10.1007/s12572-023-00360-5
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DOI: https://doi.org/10.1007/s12572-023-00360-5