振動片挿入による円管内熱伝達促進

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  • Augmentation of Heat Transfer in a Tube with an Oscillating Thin Plate
  • シンドウヘン ソウニュウ ニ ヨル エンカンナイ ネツ デンタツ ソクシン

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This paper shows how the heat transfer coefficients along a heated tube are affected by the ratio of the first plate to the second plate of oscillating plates of various types which are oscillating by an internal flow in a circular tube is inserted at the inlet in order to augment heat transfer along the tube wall. The heat transfer performance was evaluated under the condition of a fixed pumping power, and it was found that the performance ratio, η, for the entrance region attainded the maximum at λ^<1/3>Re= 8 x 10^3 and became 1.5, for fully developed turbulent region took nearly one, because the oscillating plate could not be set closer to the tube wall and Strouhal number was very small.

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