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Iwamoto, Yukiharu*; Kondo, Manabu*; Minamiura, Hirotaka*; Tanaka, Masaaki; Yamano, Hidemasa
Journal of Fluid Science and Technology (Internet), 7(3), p.315 - 328, 2012/08
LDV measurements in a 90 degree elbow of which the curvature radius coincides with its inner diameter were examined for the cases of inflow from a long pipe, short pipe and swirl generator. Ensemble averaged flow distribution at the Reynolds number of 320000 based on the inner pipe diameter and bulk velocity shows that shortening the upstream pipe length to 4.9D from 10D induces the flow separation downstream of the elbow.
Iwamoto, Yukiharu*; Minamiura, Hirotaka*; Sogo, Motosuke*; Yamano, Hidemasa
Nihon Kikai Gakkai Rombunshu, B, 76(765), p.830 - 838, 2010/05
Detailed results of LDV measurement for Reynolds number of 50000 is shown. Frequency analyses of axial velocities indicate that two kinds of flow fluctuations exist in the present elbow. One is the fluctuation with approximate Strouhal number (based on a pipe inner diameter and a bulk velocity) of 1.0 occurring in a shear flow region. The other is with approximate Strouhal number of 0.5 occurring in the separated and its downstream regions. These fluctuations were also observed by flow visualization.
Iwamoto, Yukiharu*; Sogo, Motosuke*; Ezoe, Takanori*; Minamiura, Hirotaka*; Yamano, Hidemasa; Kotake, Shoji
no journal, ,
This study considered an unsteady flow dynamics by measuring velocity distributions and observing the flow in a pipe with a short elbow.
Minamiura, Hirotaka*; Ezoe, Takanori*; Iwamoto, Yukiharu*; Sogo, Motosuke*; Yamano, Hidemasa; Kotake, Shoji
no journal, ,
The LDV measurement allowed us to investigate the time-averaged and time-dependent flow characteristics in a short-elbow pipe flow.
Iwamoto, Yukiharu*; Minamiura, Hirotaka*; Aoyama, Yoshiyuki*; Murakami, Koichi*; Yamano, Hidemasa; Kotake, Shoji
no journal, ,
Velocity distributions have been measured by an LDV under 50000 of Reynolds number to grasp the flow characteristics in a hot-leg piping with a single elbow.
