In your opinion what are the best fluids to use to experiment with non-Newtonian fluid.
I look for a shear-thinning fluid (without viscoelasticity).
I am also looking for a viscoelastic fluid (without elongational properties).
I want to work at room temperature.
Transparent fluids are desirable
The maximum shear rate is 1000 s-1
Dear Albert,
May be you can try to use CMC (carboxymethyl cellulose) aqueous solutions in low concentration.
Patrice
Dear Albert,
Gels while flowing above the yield stress are generally shear thinning and have very little elasticity. Below the yield stress they are of course viscoelastic solids. Carbopol solutions are an example, and are transparent. Probably the extensional non-Newtonian effects are also negligible above the yield stress.
Paulo
I had a great deal of success using xanthan at 0.5% concentration by mass, for modelling ice shelves (shear thinning coefficient = 3.5 or so). The procedures are described here, though I'm happy to give more information. It's transparent.
http://arxiv.org/abs/1310.7998
Liquid with a very distinctive non-Newtonian properties is glycerin. This is revealed by our measurement of its low-frequency spectrum of velocity correlations by NMR, but this has not yet been published. Similar but less pronounced characteristic we have found also the water in the range of kilohertz. Paper about our method of measurement is in "J. Stepišnik, A. Mohorič, C. Matea, S. Stapf, I. Serša, Velocity autocorrelation spectra in molten polymer measured by NMR modulated gradient spin-echo, EuroPhysics Letters, 106 (2014) 27007".
Glycerine has a much higher viscosity than xanthan & I think it's less shear-thinning. Depends exactly what you want. What'll be good is to estimate the timescale of the experiment and see if this is acceptable, though it isn't always possible to do this.
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