Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-12-04
Physics
Condensed Matter
Soft Condensed Matter
6 figures
Scientific paper
Starch solutions, which are strongly non-Newtonian, show a surface instability, when subjected to a load. A droplet of the fluid is sandwiched between two glass plates and a weight varying from 1 to 5 kgs. is placed on the top plate. The area of contact between the fluid and plate increases in an oscillatory manner, unlike Newtonian fluids in a similar situation. The periphery moreover, develops a viscous fingering like instability, which is not expected under compression. We attempt to model the non-Newtonian nature of the fluid through a visco-elastic model incorporating generalized calculus. This is shown to exhibit a qualitatively similar oscillatory variation in the surface strain.
Chandra Subrata
Choudhury Moutushi Dutta
Das Shantanu
Nag Soma
Tarafdar Sujata
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