A Study on the Drag Reduction with Polymer Additives

고분자물질(高分子物質) 첨가(添加)에 따른 마찰저항감소(摩擦抵抗減少)에 관한 연구(硏究)

  • 김재근 (명지대학교 대학원 기계공학과) ;
  • 차경옥 (명지대학교 기계공학과) ;
  • 최형진 (인하대학교 고분자공학과) ;
  • 김종보 (인하대학교 기계공학과)
  • Published : 1996.05.01

Abstract

It is well known that drag reduction in single phase liquid flow is affected by polymer material, molecular weight, polymer concentration, pipe diameter, and flow velocity. Drag reduction in two phase flow can be applied to the transport of crude oil, phase change system such as chemical reactor, pool and boiling flow, and to present cavitation which occurs in pump impellers. But the research of drag reduction in two phase flow is not sufficient. The purpose of the present work is to evaluate the drag reduction by measuring pressure drop, void fraction, mean liquid velocity, and turbulent intensity whether polymer is added in the horizontal two phase system or not. Experiment has been conducted in a test section with the inner diameter of 24mm and the length of 1,500mm. The polymer materials used are two kinds of polyacrylamide[PAAM] and co-polymer[A611P]. The polymer concentration was varied with 50, 100 and 200 ppm under the same experimental conditions. Experimental results showed that the drag reduction of co-polymer is higher than that of polyacrylamide. Mean liquid velocities increased as polymer was added, and turbulent intensity decreased inversely near the pipe wall.

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