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MIST COOLING FOR AIR HEAT EXCHANGERS

DOI: 10.1615/AnnualRevHeatTransfer.v5.110
pages 383-436

Yujiro Hayashi
Department of Mechanical Systems Engineering, Kanazawa University, Ishikawa 060, Kanazawa, Japan

Akira Takimoto
Department of Human and Mechanical Systems Engineering, Kanazawa University, 2-40-20 Kodatsuno, Kanazawa 920-8667, JAPAN

Résumé

The present work was undertaken to pursue the high performance of the mist-cooled heat exchanger. First, fundamental problems in mist cooling, such as droplet behavior in a gas boundary layer, its resulting collision and wetting conditions were studied for two types of droplet-surface systems: the collision type and the passing type. Second, mist cooling heat transfer was studied on the horizontal circular cylinder with smooth surface exposed to a transverse cross-flow. Here, the mechanism of mist cooling was discussed, and the heat transfer enhancement was correlated with the dimensionless relevant parameters. Third, a high-performance mist-cooled tube having a fine surface structure was developed from the standpoint of heat transfer augmentation especially for the back surface of the cylinder. Finally, mist cooling heat transfer for the heat exchanger of staggered tubes was clarified including the effects of mutual interferences among the tubes, and the optimization of the operating conditions was determined.

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