Abstract
It is shown that some viscoelastic fluid theories show an increased “resistance” to nonviscometric (or nonshearing) deformations due to “normal-stress effects,” but no upper limit on stretch rate is discernible. Using this fact in a one-dimensional Burgers-type model of “weak turbulence,” drag reduction is predicted.
Some observations on transition in solutions of polyethylene-oxide (Polyox) were made using a water-table. The main findings are not discordant with the idea of extra difficulty in setting up nonviscometric motions. It was found that (i) the rate of spread of turbulent “spots” is reduced; (2) a fine-grained wavy structure convered the surface; waviness increased with concentration; and (3) turbulent spot generation at sharp edges was reduced.
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References
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Tanner, R.I. (1969). Normal-Stress Effects in Drag-Reducing Fluids. In: Wells, C.S. (eds) Viscous Drag Reduction. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-5579-1_24
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DOI: https://doi.org/10.1007/978-1-4899-5579-1_24
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