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Numerical analysis of turbulent flow with heat transfer in a square duct with 45 degree ribs

45度傾斜リブを配した矩形ダクトの乱流伝熱数値解析

岡垣 百合亜*; 杉山 均*; 加藤 直人*; 寺田 敦彦; 日野 竜太郎

Okagaki, Yuria*; Sugiyama, Hitoshi*; Kato, Naoto*; Terada, Atsuhiko; Hino, Ryutaro

高温のヘリウムガス熱交換器の伝熱促進等に有用な45度に傾斜した矩形リブを配した矩形ダクト内の乱流熱伝達特性について、新たに開発した代数応力モデルを用いて数値解析を実施した。解析結果は、PIVによる高レイノルズ数の乱流場における実験結果をよく再現しており、解析モデルの妥当性を確認できた。

Turbulent flow and heat transfer characteristics in a square duct of 100 mm height with 45 degree square ribs of 10 mm height was analyzed numerically by using algebraic Reynolds stress model including the fixed turbulent Prandtl number and algebraic turbulent heat flux models. In this research, analytical results were compared with the experimental and predicted data reported by Bonhoff et al, which were measured and analyzed turbulent flow fields at Reynolds number 50000 based on bulk velocity and duct height by means of a PIV system and a Reynolds stress model. As a result of this study, it was verified that the presented method was able to predict turbulent flow in duct with ribs through the comparison of calculated results with the experimental data.

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