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Degradation of polymer additives is enhanced at higher temperature of the test solutions. The degradation of Co-polymer solution was investigated experimentally in a closed loop at the temperature of 60 ℃ and 80 ℃ with various polymer concentrations of 100, 200, 400, 600 ppm in order to see the effect of temperature and polymer concentration with time.
The degradation effects were found to be more dependent on temperature than mechanical shear. The drag friction versus He curves show that in. the range of He 50,000 - 150,000 the friction was decreased as Reynolds number inceased and the friction of solution at low temperature approached to Virk's maximum drag reduction asymptote.
For constant flowrates and temperatures the degradation effect was found to be less likely in higher polymer concentration. For constant flowrates and polymer concentrations the degradation rates are affected mainly by temperature. At the temperature of 80 ℃ and polymer concentration of 100 ppm, drag reduction effect was disappeared after 4 hours. However, this thermal degradation could be avoided with additional materials such as surfactants which are supposed to enhance the bonding forces between polymer molecules.

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Abstract

1. 서론

2. 이론적 배경

3. 실험

4. 실험결과 및 고찰

5. 결론

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UCI(KEPA) : I410-ECN-0101-2009-553-015458672