二次元拡大縮小流路の流動および伝熱特性 : コーナ部の丸みの影響

概要

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Numerical computations were carried out to determine the heat transfer and pressure drop responses to the rounding of the peaks of a converging-diverging duct. A cosine-wall duct was selected as a representative duct which has a large degree of peak roundness. Computations were carried out for Prandtl number of 0.7, in the Reynolds number range from 100 to 1 000, for various taper angles of the duct, and for three ratios of maximum-minimum heights of the duct. The rounding of the peaks brought about a decrease in the friction factor. The heat transfer performance of the rounded duct was compared with the unrounded duct under three different constraints : fixed pumping power, fixed pressure drop and fixed mass flow. The heat transfer rate was relatively insensitive to whether the peaks were sharp or rounded.
一般社団法人日本機械学会の論文
1986-05-25