Abstract
In this section of Resonance, we invite readers to pose questions likely to be raised in a classroom situation. We may suggest strategies for dealing with them, or invite responses, or both. “Classroom” is equally a forum for raising broader issues and sharing personal experiences and viewpoints on matters related to teaching and learning science.
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Suggested Reading
H Barnes, A Handbook of Elementary Rheology, The University of Wales Institute of Non-Newtonian Fluid Mechanics, 2000.
J Walker, Amateur Scientist: Serious Fun with Polyox, Silly Putty, Slime and other Non-Newtonian fluids, Sci. Amer., November, p.186, 1978.
D Boger and K Walters, Rheological Phenomena in Focus, Elsevier, 1992.
If a thin layer of cornstarch solution is vibrated, stable ‘holes’ can be created in the layer if a puff of air is blown on the surface. See the video: youtube.com/watch?v=H1Rzv0HAdug
A Kaye, A Bouncing Liquid Stream, Nature, Vol.4871, p.1001, 1963.
E Guyon, J Hulin, L Petit, and C Mitescu, Physical Hydrodynamics, Oxford University Press, 2nd ed., 2015.
A dyed 0.5% aqueous solution of high-molecular weight (~6,000,000 atomic mass unit) polyethylene oxide may be used to demonstrate self-syphoning of a viscoelastic liquid: The extensional viscosity of the fiuid increases when a liquid flament is subject to extensional strain (or strain-rate) using a spatula, as shown in the video: youtube.com/watch?v=g4od-h7VoRk
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Kalelkar, C. Classroom. Reson 22, 697–703 (2017). https://doi.org/10.1007/s12045-017-0513-y
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DOI: https://doi.org/10.1007/s12045-017-0513-y