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설성훈(Seol Sung-Hoon),윤정인(Yoon Jung-In),이준혁(Lee Joon-Hyuk),차승윤(Cha Seung-Yun),하수정(Ha Su-Jeong) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.4
In this study, the condensation heat transfer characteristics of the R-1234yf refrigerant were analyzed according to the variation in tube diameter, which were then considered as condenser design data. The inner diameter of the experimental tube was varied from 3.7 ㎜ to 5.3 ㎜. Subsequently, the heat transfer coefficient of R-1234yf was analyzed according to the changes in vapor quality, mass flux, saturation temperature, and pipe diameter. Slug flow was observed at a low mass flux, and annular flow was observed at a high mass flux. Furthermore, it was observed that the heat transfer coefficient’s value increased with increase in the vapor quality and mass flux, whereas it decreased with increase in the tube diameter and saturation temperature. By comparing the heat transfer coefficients of the refrigerants R-134a and R-1234yf, it was found that the heat transfer coefficient of R-134a is higher. Furthermore, four correlations were conducted, and it was found that the correlation of Dobson and Chato and the correlation of Bashar can predict the experimental condensation heat transfer coefficient within an error range of ±10%.
선박 Anti Heeling System 용 양방향 펌프의 유동해석
윤정인(Yun Jeong-In),박재현(Park Jea-Hyoun),김정환(Kim Jeong-Hwan),강철중(Gang Cheol-jung),강규홍(Gang Gyu-Hong) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This study is analysis the two-way pump flow characteristics in using anti heeling system of ship and we confirmed performance according to the change of impeller shape.
권오경,윤정인,윤재호,Kwon, Oh-Kyung,Yoon, Jung-In,Yun, Jae-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5
This study was concerned with the enhancement of mass transfer by surfactant added to the aqueous solution of LiBr. Different vertical inner tubes were tested with and without an additive of normal octyl alcohol. The test tubes were a bare tube, groove tube, corrugate tube and inserted spring tubes. The additive concentration of normal octyl alcohol as a surfactant is about 0.08mass%. The Sherwood number was measured as a function of film Reynolds number 20~200. The experimental results were compared with those which use no surfactant. The enhancement of mass transfer by Marangoni convection effect which was generated by addition of the surfactant is proved for each testing tube Especially, it is clarified that the tube with the spring has the highest enhancement effect. A correlation of the experimental mass transfer data for the bare, groove, corrugate and insert spring tubes results expressed as the form of Sh=cㆍ Re$_{f}$ $^{n}$ .