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고속공기 주입에 따른 냉간모형 용융로 내 침투 특성 및 기포발생 특성에 관한 실험적 연구
김대성(Dae-Sung Kim),이진호(Jinho Lee),양원(Won Yang),류태우(Tae-U Yu),신동훈(Dong-hoon Shin) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Conditions related to injection of high speed air should be carefully determined to obtain better mixing in the melting chamber. In this study, air penetration lengths for various air injection rates and nozzle diameters were measured in the cold flow model for the melting chamber, along with bubble volume fraction and frequency of bubble generation using an electro-conductivity probe. When the nozzle diameter increased, penetration length decreased because of the decrease in initial momentum. Volume fraction of bubbles and frequency of the bubble generation also decreased for larger nozzle diameters, while they increased when the air flow rate was increased, since the bubbles were broken by drag force.
Air-Water 모델에서 가시화를 통한 유동특성에 관한 연구
임태훈,박근욱,서동표,정낙규,김진흥,오율권 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.2
In the air-water model, the characteristics of flow parameters were experimentally investigated. An electro-conductivity probe was used for measuring flow parameters such as local volume fraction and bubbles frequency. The flow parameters were very high at the near nozzle. For visualization of flow characteristics, a camera technique method and a thermo vision camera were adopted in the present study. The experimental results shows that the heat transfer from bubble surface to water is almost achieved within z=10[mm〕 from the nozzle. Then the temperature of bubble surface teaches to the water temperature in a short time. The camera and argon illumination laser were applied to the water circulation zone for flow visualization. The flow was more developed near the wall than at bubble-water plume. Voltex flow in the bottom region was relatively weaker than in the upper region.
Air-Water 모델에서 기포특성에 관한 실험적 연구
오율권,서동표 한국산업안전학회 2003 한국안전학회지 Vol.18 No.1
The structural development of air-water bubble plumes has been measured under different condition on air flow rate in a cylindrical bath. The time-averaged structure of plumes has been measured with an oscilloscope and an electro-conductivity probe. The temperature of bubbles was also obtained by a thermal-infrared camera. Gas volume fraction and bubble frequency were high since bubbles concentrated on the nozzle. In general, their axial and radial values tended to decrease with increasing distance. Bubble temperature reached water temperature within a short time. The present study showed that thermal equilibrium between bubbles and water was completed before bubbles flow became stable.