난류 유동일때 관과 channel에서 고분자와 계면활성제에 의한 마찰저항 감소에 관한 연구

Drag Reduction by Polymer and Surfactant in Tubulent Channel and Pipe Flows

The drag reduction phenomenon with an additives of surfactant(STAC, stearlytrimethyl ammonium chloride) and polymer(PEO, polyethlene oxide) was investigated in fully developed turbulent pipe and channel flows at various low Reynolds numbers as well as very low additives concentration. A maximum of 70% drag reduction compared with plain water flow was found. This maximum drag reduction percentage obtained with surfactant solution was slightly higher than that of the Virk's asymptote in polymer solution.