관수로에서 마찰감소를 위한 고분자의 실험적 연구 I

다국어 초록 (Multilingual Abstract)

The drag reduction is the phenomenon that occurs only when the shear stress from the wall of pipe is beyond the critical point. The drag reduction increase as the molecular weight, concentration of the polymer and Reynolds unmber
increase. But it is limited by Virk's maximum drag reduction asymptote. Because of the strong shear force for the pol)'l1H on the turbulent flow, the molecular weight and the drag reduction did not decrease. Such mechanical degradation of the polymer occurs in all polymer solvent systems. We found that there is no study on vertical-up flow of close system on the drag reduction. Thus, the objectives of this paper was to identify and develop high performance polymer additives for fluid transportations with the benefits of turbulent drag reduction. In addition, we will evaluated the drag reduction in vertical flow by measuring the pressure drop on vertical-up flow of close system.

목차 (Table of Contents)

• 1. 서론 1
• 2. 관련이론 3
• 1. 고분자물질의 퇴화 3
• 2. 마차저항의 감소현상에 따른 방정식 3
• 3. 실험장치 및 방법 4
• 3.1 실험장치 4
• 3.2 시험부 및 실험방법 5
• 4. 실험결과 및 검토 6
• 4.1 저항감소와 기계적 퇴화 6
• 4.2 저항감소와 열적 퇴화 7
• 5. 결론 8