Fully Developed Turbulent Flows through Rectangular Ducts with One Roughened Wall

概要

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An experimental study has been conducted on fully developed turbulent flows through rectangular ducts with one rough wall. Two ducts, one with a long-side rough wall and the other with a short-side rough wall, have been used. The distributions of the mean velocities and turbulent stresses over a whole cross section in the fully developed region were measured by hot-wire anemometry. The secondary flow distributions in both the rough ducts were remarkably different from those in the smooth-walled duct. In the long-side rough duct, only one large secondary flow vortex appeared near the short-side wall. In the short-side rough duct, a similar large longitudinal vortex also appeared near the corner formed by the rough and the smooth walls. Furthermore, it was revealed that the contribution of turbulent shear stress <u_2u_3>^^^- was as important as that of the turbulent normal stresses (<u^2_2>^^^--<u^2_3>^^^-) for the generation of the secondary flow of the second kind in both the rough ducts.
社団法人日本機械学会の論文
1990-11-15