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- W4386994920 abstract "Effective cooling technologies are essential to use energy efficiently. Recent results of large eddy simulation by authors’ group has found that channel flow pulsation is effective for improvement of heat transfer performance on a channel wall with teardrop-shaped dimples. In this study, effects of flow pulsation on overall heat transfer performance over dimpled surface were experimentally investigated by transient technique with compensation of three-dimensional heat conduction. Seven different surface geometries were examined, by changing the angle of the dimples to the flow direction and dimple arrangement (inline and staggered). Strouhal number based on the dimple diameter of 0.15, pulsating flow amplitude of 10% and 15% of mean velocity, and bulk Reynolds number of 2.5×104 were considered for the pulsating flow conditions. With flow pulsation, Nusselt number became 12.7% and 10% larger than that without pulsation for the cases of 30 deg and 60 deg inclined dimpled surface of inline arrangement respectively. However, friction coefficient became 86% and 67% larger than that without pulsation for the cases of 30 deg and 60 deg inclined dimpled surface respectively." @default.
- W4386994920 created "2023-09-25" @default.
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- W4386994920 date "2022-01-01" @default.
- W4386994920 modified "2023-09-30" @default.
- W4386994920 title "脈動流がティアドロップディンプル面の伝熱総合性能に与える影響の過渡応答法計測" @default.
- W4386994920 doi "https://doi.org/10.1299/jsmekanto.2022.28.15j19" @default.
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