気柱共鳴を利用した円柱周りの対流熱伝達促進

概要

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To attempt the heat transfer enhancement, the experimental study of convective heat transfer around a horizontal circular cylinder across the oscillatory flow was carried out in the closed resonance tube. The oscillatory flow was occurred from the resonance of air column produced by a piston type pump in which a piston was reciprocated as an oscillator. The frequency was changed in the range of 10 to 22.5Hz under the constant amplitude. The velocity and pressure in the oscillatory flow were measured by the hot wire anemometer and the pressure transducer respectively. The time averaged heat transfer coefficients around the tested cylinder were measured by using the thermocouples. The effective Reynolds number was significantly increased by the resonance of air column. The local Nusselt number around the tested cylinder was increased in according with the increasing the effective Reynolds number. The empirical formula as functions of the effective Reynolds number and the mean Nusselt number was obtained. As a result, it was confirmed that the convective heat transfer characteristics was enhanced by using the oscillatory air column in the closed resonant tube.
福山大学の論文