C112 壁面粗度の急変を伴う正方形流路内乱流熱伝達の弛緩過程

概要

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The response of turbulent flow and thermal fields in a straight square duct to a rough-to-smooth step change in the surface roughness has been investigated experimentally. The distributions of the primary flow velocity, mean temperature, intensities of velocity and temperature fluctuations, turbulent shear stresses, and turbulent heat fluxes have been measured in two cross-sections located 2D and 4D downstream from the rough-to-smooth junction. It has been found that, after the step change in the surface roughness, the intensity of fluctuating velocity locally overshoots the values of the rough duct. Such overshoot also appears in the turbulent heat flux and turbulent shear stress, but the former approaches the equilibrium values for the smooth duct more rapidly than the latter.
日本流体力学会の論文
2000-07-25