流れと平行な突起を有する長方形断面管路内の乱流構造解析

概要

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A numerical analysis has been performed on developing turbulent flow in a rectangular duct of aspect ratio 2.25 : 1, two of whose long-side walls were roughened. Roughness elements with trapezoidal cross section were located along the strearmwise direction. In the calculation, an algebraic stress model was adopted in order to predict Reynolds stresses precisely, and a boundary-fitted coordinate system was introduced to briefly set the boundary conditions. Calculated results were compared with the experimental data available. As a result of this calculation, it was found that the present method could predict streamwise velocity and secondary flow well. The intensity of the secondary flow near the longitudinal roughness element was greater than that in the corner region. This phenomenon strongly suggests that a duct with a longitudinal roughness element is applicable for promoting heat and mass transfer without increasing pressure drop.
一般社団法人日本機械学会の論文
1994-06-25