配管要素の組み合わせにより発生する旋回流の物質移動係数評価
Evaluation of mass transfer coefficient under swirl flowgenerated by the combination of pipe elements
著者:
鈴木 翔太 Shota SUZUKI 中村 隆夫 Takao NAKAMURA 米田 公俊 Kimitoshi YONEDA
発刊日:
公開日:
combination of pipe elementsflow accelerated corrosionmass transfer coefficientswirl flow
概要
Flow accelerated corrosion (FAC) is the major pipe wall thinning phenomena in power plants. The management of pipe wall thinning has been carried out to pipe elements such as elbow, orifice, etc. of the piping system in power plants. In piping system, it is known that several pipe elements which are connected in series may generate swirl flow. Therefore the arrangement of pipe elements is considered to affect thinning phenomena seriously. So the behavior of this swirl flow is one of the major research tar gets to improve the accuracy of simulation codes. In Mihama Unit3 pipe failure accident in 2004, it was pointed out the swirl flow caused by the piping layout might influence the thinning rate behind orifice. This paper focuses on the conditions and parame ters that affect the generation of swirl flow and analyzes the effect of parameters in mass transfer coefficient behind pipe elements. The results of this research will reflect to the evaluation of fluid-dynamic factor of FAC taking account of swirl flow.
