傾斜リブ付き正方形断面回転直管における乱流熱伝達のLES

概要

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Heat transfer in a rotating rib-roughened duct was numerically simulated by using the second order finite difference method in coordinates fitted to angled ribs. In order to investigate the effect of the Coriolis force and the angled rib turbulators on the turbulence, the large eddy simulation was adopted with a Lagrangian dynamic subgrld-scale model. For the turbulent Reynolds number of 350,stationary and rotating conditions were computed for a rib angle of 60 deg, and the results were compared with the prevlous results of transverse 90 deg rib case. The present results clearly showed the locally high heat transfer coefficient at following locations : midpoint between ribs, in front of the rib on the rib-roughened walls, and around the rib on the side walls. The rotation induced the dissimilarity between the streamwise velocity and temperature, and the friction factor and overall Nusselt number were decreased by the rotation for 60 deg rib case which was opposite to the 90 deg rib case.
社団法人日本ガスタービン学会の論文
2000-03-20