Abstract
The effects of concentration, flow rate, and tube diameter on drag reduction in non-polar soap solutions were studied. Aluminum dioleate in toluene solutions were used in pressure drop measurements at concentrations of 0.2, 0.5, 0.75 and 1.0 per cent. Pressure drop measurements were made in tube diameters ranging from 0.01 to 2.0 inches. A few such measurements were also made with an aluminum palmitate soap in toluene.
The results of these measurements differed from those observed in aqueous systems. Higher concentrations (0.75 per cent) were required before drag reduction occurred. No critical upper shear stress was observed. While little mechanical degradation was observed after an initial holding period, the solutions degraded on aging.
Thus, while aqueous soap systems have appeared to be at equilibrium and have shown reversible shear effects, the changes in viscosity with time for these non-polar systems indicate that they were not at equilibrium. It is believed that the differences in the nature of the soap structure in solution for the two types of systems cause the observed differences in the turbulent flow behavior.
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Radin, I., Zakin, J.L., Patterson, G.K. (1969). Exploratory Drag Reduction Studies in Non-Polar Soap Systems. In: Wells, C.S. (eds) Viscous Drag Reduction. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-5579-1_10
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DOI: https://doi.org/10.1007/978-1-4899-5579-1_10
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