지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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Recently only a few correlations between various factors due to the different grades of surface roughness for the nucleate pool boiling have been proposed.
The main purpose of this work is to test the validity of these types of correlations between related factors to nucleate pool boiling phenomena.
The boiling experiments using distilled water were carried out at the heat flux ranging from 7.4×10⁴ to 2.4×10^5 ㎉/㎡h on the sintered porous metal surface with the cavity diameter of 10, 20, 40, 70, 100μ, respectively, at the atmospheric pressure.
To determine the bubble sizes, number of nucleation sites, delay and growth time, frequency of bubble emission, and rising velocities of bubbles, the high speed motion picture technique was employed.
In the correlation f∝Dⁿb, where f denotes frequency of bubble emission and Db departure diameter, n, the power factor of Db, have been found to be from -2 to -10/3.
The constant C in the correlation between heat flux q and density of nucleation sites N/A, q=C(N/A)ⁿ, was appeared to be more crucial than the power factor n.
The correlation of the heat flux q to the temperature difference ΔT and the density of nucleation sites N/A, was proposed to be q-460 ΔT^(5/4)=KΔT^(5/3) (N/A)^(⅔) where K was found to be 9.3×l0^(-9).
The values of heat transfer coefficient obtained in this experiments for the porous sintered metal surface appeared to be very high in comparison with the formerly obtained results for the other surfaces.
The main purpose of this work is to test the validity of these types of correlations between related factors to nucleate pool boiling phenomena.
The boiling experiments using distilled water were carried out at the heat flux ranging from 7.4×10⁴ to 2.4×10^5 ㎉/㎡h on the sintered porous metal surface with the cavity diameter of 10, 20, 40, 70, 100μ, respectively, at the atmospheric pressure.
To determine the bubble sizes, number of nucleation sites, delay and growth time, frequency of bubble emission, and rising velocities of bubbles, the high speed motion picture technique was employed.
In the correlation f∝Dⁿb, where f denotes frequency of bubble emission and Db departure diameter, n, the power factor of Db, have been found to be from -2 to -10/3.
The constant C in the correlation between heat flux q and density of nucleation sites N/A, q=C(N/A)ⁿ, was appeared to be more crucial than the power factor n.
The correlation of the heat flux q to the temperature difference ΔT and the density of nucleation sites N/A, was proposed to be q-460 ΔT^(5/4)=KΔT^(5/3) (N/A)^(⅔) where K was found to be 9.3×l0^(-9).
The values of heat transfer coefficient obtained in this experiments for the porous sintered metal surface appeared to be very high in comparison with the formerly obtained results for the other surfaces.
목차
Abstract
1. 緖論
2. 實驗
3. 實驗結果 및 考察
4. 結論
後記
References
참고문헌 (0)
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