対向二面に粗面をもつ正方形流路内の乱流 : 第1報,速度・応力場の測定

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A fully developed turbulent flow in a square duct, two opposite walls of which had been roughened by square cross-sectioned ribs, was measured using a hot wire anemometer. This paper presents the resulting velocities and stresses, and compares them with measurements taken in a square duct with four smooth walls. Symmetrical results, relative to the axes of symmetry of the duct cross-section, were obtained in such areas as mean axial velocity, turbulent kinetic energy, and <u_1,u_2>^^-. Asymmetrical results, however, showed up in <u_1,u_2>^^- and in the secondary velocity vector. As is well know, smooth-walled ducts yield two secondary flow cells in any given quadrant of a cross-section. But in ducts whose opposite walls have been roughened, we found a heretofore unobserved phenomenon: only one relatively large cell appeared in each quadrant of duct's cross-section.
一般社団法人日本機械学会の論文
1986-10-25