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이상천,한용운,신현승,이형돈,Lee, S.C.,Han, Y.O.,Shin, H.S.,Lee, H.D. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.1
An experiment has been carried out to identify flow patterns in a horizontal condensing flow with R-113. Characteristics of flow patterns were determined based upon a statistical analysis of differential pressure fluctuations at an orifice. The probability density function and power spectral density function of instantaneous pressure drop curves for various flow conditions were obtained. In comparison to the results of air-water flows, the flow patterns in a condensing flow such as annular, wavy, slug and plug could be identified. The experimental data determined by this technique were compared with the flow pattern maps suggested by other investigators. The result indicates that the statistical characteristics of differential pressure fluctuations at an orifice may be a useful tool for identifying flow patterns both in condensing flows and in adiabatic two-phase flows.
송동주(D. J. Song),이재원(J. W. Lee),최성렬(S. R. Choi),한용운(Y. O. Han),신재균(J. K. Shin) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The objectives of First Year Design, or Introduction to creative engineering design , are to increase freshman engineers' understanding of engineering design and to stimulate curiosity of students and thus to increase the retention rate of students in engineering school. This course helps students to acquire non technical performance outcomes such as team work, communication skill and problem solving skills. First year design course has been developed for past 4 years in Yeungnam University as a part of project for developing innovative engineering education methods in Korea Engineering Education Research center in ABEEK.