ダクト内バックステップ流れの熱伝達に関する数値解析 : 流体粒子軌跡のパターンについて(熱工学,内燃機関,動力など)

概要

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Three-dimensional flow and thermal fields have been solved numerically for the stepped duct laminar flow for different inlet flow conditions, uniform flow and fully developed flow. Attention has been paid to the particle trajectories over the step and their relation to the spatial distributions of the heat transfer coefficient on the bottom wall behind the step. Fluid particles entering the flow recirculation behind the step was found to be started from the small limited area in the vicinity of the side wall for both inlet flow conditions. Such particles, in the uniform flow case, move toward the center of the duct forming spiral motions and they flow downstream one by one before they reach to the center of the duct. However, in developed inlet flow case, such particles proceed together until they reach the center of the duct showing large unique spiral motion and then they flow downstream from the center of the duct. Owing to this, low heat transfer coefficient is obtained at the center of the duct and low heat transfer area becomes larger compared to that in the uniform inlet flow case.
2009-01-25