• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 1997.10a
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• pp.16-16
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• 1997

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2001.05a
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• pp.29-29
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• 2001

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2001.11a
• /
• pp.15-15
• /
• 2001

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 2002.11a
• /
• pp.19-19
• /
• 2002

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 2002.11a
• /
• pp.59-61
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• 2002

No Abstract, See Full Text

• Proceedings of the Korean Magnestics Society Conference
• /
• 2004.06a
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• pp.28-29
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• 2004

• Journal of the KSME
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• v.22 no.1
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• pp.34-39
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• 1982

본 해설에서는 nucleation현상의 한 예로 과포화상태에 있는 증기 (vapor)의 응축과 정(condensation)을 중심으로 설명하고자 한다. 제 2절에서는 nucleation 현상의 예와 그 응용에 대해서 설명하기로 하고 제 3절에서는 열역학적인 면에서 제 4절은 운동론적인 면에서 제 5절은 nucleation theory의 문제점에 관해 고찰해 보려 한다.

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 2003.04a
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• pp.27-27
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• 2003

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.4 no.1
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• pp.18-22
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• 1975

A simple analysis has been made of the condensation of vapor onto rivulets of condensate which are formed by non-wetting narrow Taflon strips circumferencially located in a certain interval on horizontal tubes. Heat transfer to the rivulets increased over $50\%$ above that to the Nusselt uniform thickness film. Results are directly applicable to condenser tubes in large steam condensers.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.26 no.7
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• pp.315-321
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• 2014

In this study, external condensation heat transfer coefficients (HTCs) of two non-azeotropic refrigerant mixtures of HFC32/HFC152a at various compositions were measured on both 26 fpi low-fin and Turbo-C enhanced tubes, of 19.0 mm outside diameter. All data were taken at the vapor temperature of $39^{\circ}C$, with a wall subcooling of 3~8 K. Test results showed that the HTCs of the tested mixtures on the enhanced tubes were much lower than the ideal values calculated by mass fraction weighting of the pure component HTCs. Also, the reduction of HTCs due to the diffusion vapor film was much larger than that of a plain tube. Unlike HTCs of pure fluids, HTCs of the mixtures measured on enhanced tubes increased, as the wall subcooling increased, which was due to the sudden break-up of the vapor diffusion film with an increase in wall subcooling. Finally, the heat transfer enhancement ratios for mixtures were found to be much lower, than those of pure fluids.