オリフィス背後の物質輸送現象に及ぼす曲り旋回流の影響(ステレオ PIV を用いた速度場計測)
Influence of Curved Swirling Flow on Mass Transfer Phenomenon behind an Orifice(Velocity Field Measurement by Stereo PIV)
著者:
金谷 信明 Nobuaki KANATANI 山縣 貴幸 Takayuki YAMAGATA 藤澤 延行 Nobuyuki FUJISAWA
発刊日:
公開日:
Curved FlowFlow Accelerated ErosionMass TransferNuclear Power PlantOrificePipe-wall ThinningStereo PIVSwirling Flow
概要
Abstract The velocity field behind an orifice in a circular pipe is studied by PIV measurement u nder the influence of curved swirling flow to elucidate the asymmetric pipe-wall thinning pheno menon behind an orifice. The experiment is carried out in a closed water tunnel at Reynolds numb er Re = 19,000. The stereo PIV measurement of the cross-sectional velocity field in a pipe flow indicates that the flow reattachment occurs on one side of the pipe flow irrespective of the ori fice bias. This is due to the influence of the twisted vortex core of the swirling flow through the orifice. This flow pattern is expected to promote the mass transfer rate on one side of the pipe, which is closely related to the higher thinning rate of the pipe wall behind the orifice.
