傾斜リブ付き回転直管内乱流熱伝達における管路断面アスペクト比の影響

概要

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Heat transfer in a rotating rectangular rib-roughened duct was numerically simulated by using the second order finite difference method. In order to investigate the effect of the Coriolis force and the cross-sectional aspect ratio on the turbulence, the large eddy simulation was adopted with a Lagrangian dynamic subgrid-scale model. The rotation number (O and 1.0) and the cross-sectional aspect ratio (0.25,0.5,1.0,2.0,4.0) were varied for a turbulent Reynolds number of 350 and rib angle of 60 deg. The present results clearly showed the locally high heat transfer at the following locations : between ribs and in front of the rib on the rib-roughened walls ; the locations were shifted to the left wall because of the flow induced by the angled rib. The dissimilarity between the streamwise velocity and temperature was observed for all the aspect ratio cases in the rotating case. The overall heat transfer and friction factors were decreased by the duct rotation.
社団法人日本ガスタービン学会の論文
2000-03-20