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노즐특성에 따른 MIST-COOLING 열전달에 관한 실험적 연구
이진원,강영규,백병준,박복춘 ( J . W . Lee,Y . G . Kang,B . J . Baek,B . C . Park ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.3
The effect of nozzle characterristics on the mist-cooling heat transfer was investigated under the various flow conditions. Two different types of twin fluid nozzle were used, one is a 90° angle tip nozzle with needle and the other is a 90° angle tip non-needle nozzle. The cooling rate from the heated surface was measured and obtained the boiling curve as a function of surface temperature. An immersion sampling was employed for the measurement of droplet size of the spray. As a result of this experiment, the liquid sheet type nozzle shows better atomization when the mass ratio Mr>2.0, and collects more liquid droplets on the heated surface that results in better cooling effect. It was found that the maximum heat flux and heat transfer coefficient increased with increase in the volumetric flow rate, whereas the maximum heat flux decreased with increase in spray distance. The cooling effect depends upon the amount of collected droplet and droplet size, but it strongly depends upon the amount of collected droplet.
姜濚珪,趙鉅錤 全北大學校 1984 論文集 Vol.26 No.-
The performance of vertical and horizontal tubes with multiple fins of rectangular and triangular cross section was investigated theoretically for boiling heat transfer. A simple method for numerical program assuming one-dimensional heat flow was used to predict the performance of these finned tubes and their bundles. The object of the new study was to develop optimum fin desgin, especially in tube bundles, considering from a viewpoint to minimize the space in which the maximum heat flux density was expected.