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J. Ocean Eng. Technol. 2002;16(4):1-6.    

Experimental Investigation of Drag Reduction by Polymer Additives
중합제 첨가에 의한 항력 감소 효과에 관한 실험적 연구
성형진,위장우,권순홍,전호환
한국과학기술원,한국선급,부산대학교기계기술연구소,부산대학교기계기술연구소
Copyright © 2002 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Key Words: Polymer Additives, Drag Reduction, Turbulent Intensity, Surface Roughness
핵심용어: 중합체 첨가, 항력 감소, 난류강도, 표면 조도
Abstract
Experimental investigation of drag reduction by adding a polymer additive(polyacrylamid, N-401P) into water is carried out in a Circular Water Channel. The effect of viscosity, surface roughness and degradation as a function of running time is also measured with varying the concentration of polymer additives(20ppm,100ppm) and Reynolds numbers. Near and far wakes past a circular cylinder are observed by LDV. Drag forces are measured with a strain-gaged device. The experimental results show that around 5%-30% of drag reduction with the polymer solution are observed. The larger effects of drag reduction can be found at low range of Reynolds number, more roughened surface cylinder. The effect of polymer solution for near wakes is larger than for far wakes.


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