Articles written in Pramana – Journal of Physics
Volume 73 Issue 4 October 2009 pp 743-754
Computer simulation of viscous fingering in a lifting Hele-Shaw cell with grooved plates
Sujata Tarafdar Soma Nag Tapati Dutta Suparna Sinha
We simulate viscous fingering generated by separating two plates with a constant force, in a lifting Hele-Shaw cell. Variation in the patterns for different fluid viscosity and lifting force is studied. Viscous fingering is strongly affected by anisotropy. We report a computer simulation study of fingering patterns, where circular or square grooves are etched on to the lower plate. Results are compared with experiments.
Volume 74 Issue 2 February 2010 pp 271-279 Research Articles
Variation in viscosity and ion conductivity of a polymer–salt complex exposed to gamma irradiation
Sujata Tarafdar S K De Sujit Manna Udayan De Pradyot Nanda
We study changes in microstructure and resulting changes in the properties of PEO($1 − x$)–NH4 ClO4 (𝑥) samples where $x = 0.18$, when irradiated with gamma doses varying up to 50 kGy. Viscosities of aqueous solutions of the irradiated samples give an idea of the change in molecular weight and show correlation with ion conductivity. On the whole, there is a chain scission on irradiation, though there is evidence of some cross-linking at higher doses. The ion conductivity shows a strong increase for an irradiation of 35 kGy. DSC studies indicate a decrease in crystallinity with gamma dose.
Volume 97, 2023
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