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서동표(Dong-Pyo Seo),오율권(Yool-Kwon Oh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In the present study, the gas injection system based on air-water model was designed to investigate the behavior characteristics of bubbles injected into a ladle. The parameters such as gas volume fraction and bubble rise velocity were exprementally measured in a gas-liquid region. To measure gas volume fraction, an electo-conductivity probe was uesd and bubble rise velocity was obtained by a high speed CCD camera. Gas valume fraction was symmetric to the axis of nozzie on the bottom of a ladle. The camera. Gas volume fraction was symmetric to the axis of nozzle secured on the bottom of a ladle. The bubble rise velocity was calculated for tow different experimental conditions. That is, gas flow conditions were following two case : 1) Q=0.63×10 m/s, 2)1.26×10 m/s As a gas injected into liquid tadle, the liquid-phase region is circulated by bubbles´ behavior. The bubble rise velocity was influenced of the circulation flow of liquid phass. As a resulr, the bubble velocity was appeared hiddle region of table than near the nozzle.
서동표(Dong-Pyo Seo),홍명석(Myung-Seok Hong),오율권(Yool-Kwon Oh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The characteristics of upward bubble flow were experimentally investigated in a liquid bath, In the present study, a thermal-infrared camera and high speed CCD camera were used to measure their temperature and local rising velocity, respectively. Heat transfer from bubble surface to tater is largely completed within z=10mm from the zozzle, and then the temperature of bubble surface reaches that of water rapidly. The rising velocity of bubble was calculated for two different experimental conditions: 1) bubble flow without kinetic energy 2) with kinetic energy. Bubble flow without kinetic energy starts to undergo the effect of inertia force 10cm away from the nozzle. Whereas, kinetic energy is dominant before 30 cm away from the nozzle in bubble flow, but after this point, kinetic energy and inertial force are applied on bubble flow at the same time.
수치해석을 이용한 Tire Mold용 Al 금형의 온도분포 해석에 관한 연구
양호동(Ho-Dong Yang),오율권(Yool-Kwon Oh),서동표(Dong-Pyo Seo),박근욱(Keun-Uk Park),김우진(Woo-jin Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The plant of Al alloy mold must be established to produce the good quality tires. But mild steel molds are used as tire mold which is consist of one piece. This type of metal mold is more economic in the total cost but the quality of product is not good. Therefore, in the present study, Al alloy mold which consist of six pieces was introduced. And, numerical work using a finite element method (FEM) was applied to analyze that Al alloy mold was happened the characteristics of temperature distributions. Also, the contraction rate occurred by temperature distributions investigated to predict the accurate measurement variations of Al alloy mold.