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Degradation effects of dilute polymer solutions on turbulent friction and heat transfer behavior
Journal article   Peer reviewed

Degradation effects of dilute polymer solutions on turbulent friction and heat transfer behavior

Stephen U.S. Choi, Young I. Cho and Kenneth E. Kasza
Journal of non-Newtonian fluid mechanics, v 41(3), pp 289-307
1992
DOI: https://doi.org/10.1016/0377-0257(92)87003-T

Abstract

degradation dilute viscoelastic fluids heat transfer pipe flow turbulent flow
Long-term degradation tests for dilute polymer solutions flowing turbulently in circular pipes were conducted in a closed recirculatory flow loop at room temperature. The polymeric additives used were Polyox WSR-301 and Separan AP-273 at 200 ppm wt. in deionized water. The degradation run for Separan was conducted for 730 h, which is considerably longer than any of the earlier degradation studies reported in the literature. The degradation run for Polyox was conducted for only 22 h because of the extreme sensitivity of Polyox to shear degradation. Effects of degradation on turbulent friction and heat transfer coefficients are presented. It was found that dilute Polyox solution cannot be used in recirculatory systems because it degraded completely in less than 24 h. However, dilute Separan solution did not degrade completely under a typical flow shear condition but maintained a plateau value of about 25% friction reduction after the initial rapid degradation period. The existence of a plateau for the dilute Separan solution is an important finding because it implies that this solution may be a good candidate for use in practical closed-loop thermal systems.

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Domestic collaboration
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Mechanics
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