Selection of a suitable non-Newtonian fluid for swirling pipe flow tests

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Selection of a suitable non-Newtonian fluid for swirling pipe flow tests

Geldard, R.J.J. / Jones, T.F. / Miles, N.J. / Rhodes, D.

Recent work has focused on increasing the transport efficiency of particle-laden Newtonian fluids by the introduction of swirling flow. This has improved particle distribution and reduced critical velocity. The current work is concerned with expanding our knowledge of swirling fields on non-Newtonian fluids, for which the apparent viscosity varies with velocity gradient. Experiments have been undertaken to select and characterise a viscous, shear-thinning, time-independent fluid for swirling flow tests in a pipe loop. Sodium Carboxymethylcellulose (CMC) was selected from five other fluids. It complied with the required viscosity and showed minimal frothing in comparison to the other fluids. An investigation was then conducted into the affect of bacteria, age, temperature and evaporation on the CMC. Although the results do not conclusively support the use of a biocide the inconsistency between the control samples alone is a good reason to add a biocide. Other recommendations arising are to cover the tank and use distilled water as the solvent.