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pp.1-8
This study is experimentally to analyze the heat transfer characteristics and photographic observation of bubble generation in saturated nucleate pool boiling. The photographs were taken of water boiling from heated nickel wires. The attempts is made to explain the different nucleate boiling of water. Some of the bubbles photographed were very close to the spherical shape, while others were close to the hemispherical. Also, a number of bubble had intermediate shapes that were called oblate bubbles. At least, heat transfer regions of three and possibly four were found to exist in nucleate boiling depended upon the mode of vapor generation. The vapor structure on the surface progressed through a sequence of first discrete bubbles, then vapor columns and vapor mushrooms, and finally vapor paths, as the surface temperature was increased. These individual vapor structures or combinations of them determine the mechanism of heat transfer in the four nucleate boiling regions.
1. 서 론
2. 실험장치 및 방법
2.1 실험장치
2.2 실험방법
2.3 핵비등의 이론적 모델
3. 실험결과 및 고찰
3.1 기포의 발생과 열전달 특성
3.2 핵비등에서 무차원 특성
3.3 비등현상의 광학적 관찰
4. 결 론
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