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수직상향 이상류에서 동심원관 간극이 유동양식과 보이드분포에 미치는 영향
손병진,김인석,김문철,Son B. J.,Kim I. S.,Kim M. C. 대한설비공학회 1987 설비저널 Vol.16 No.4
An experimental investigation has been conducted to determine the flow pattern for two-component , two-phase mixtures which flow vertically upwards in concentric annuli based on the measurement for the local void fraction and the distribution of the local void fraction in various radial locations in the annular gap. The annular test section consists of a lucite outer tube whose inside diameter is 38mm and a stainless steel rod, The rod diameter is either :2mm,16mm or 20mm. It is demonstrated that the probability density function of the fluctuations in void fraction may be used as an flow pattern indicator and the local void fraction distribution depends on the flow pattern and radial location in the annular passage.
손병진,민묘식,최상경,Son, B.J.,Min, M.S.,Choi, S.G. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.4
Development of a more satisfactory program of computing the performance on a multi-tube evaporator with continuous plate fins is attempted in this study. The fluid flow involving a change of phase make the flow properties and fluid friction factor of refrigerants, the heat transfer coefficients of refrigerant and air sides vary significantly. Taking such variations into account, a useful program is developed to predict the steady state performance of a multi-tube evaporator. The program was applied to an evaporator which has outside diameter of 10.05mm, inside diameter of 9.35mm, length of 5.4m and two rows arraied staggered. Then the variations of refrigerant quality, temperature, pressure, velocity, enthalpy, specific volume and air temperature, tube temperature were discussed. Satisfactory results were presented that the degree of superheat at the outlet side was $4.4^{\circ}C$ and the air temperature drop between the inlet and outlet of the air conditioner was $10^{\circ}C$.
70도 삼각날개 와류유동의 비정상 RANS 해석 결과 분석
손미소(M. Son),사정환(J. H. Sa),박수형(S.H. Park),구기범(G. Gu),김민아(M. Kim),정경진(K. J. Jung) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
Unsteady RANS simulations were conducted in order to understand the physics of vortex flow over a delta wing at a high angle of attack. The feasibility and the accuracy of computational results were assessed through comparative study between computational and experimental data for ONERA 70-degree delta wing. Unsteady flow analysis showed a good agreement with experimental data in axial velocity and vorticity distributions. The vortex breakdown can be successfully traced by using the unsteady RANS simulation.