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김영목(Y.-M. Kim),손호재(H.-J. Son) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
Numerical investigations of three-dimensional laminar flows in a 90-degree T-branch of square cross-section were carried out. The incompressible Navier-Stokes equations in generalized curvilinear coordinates, using a pseudocompressibility approach for continuity equation, were solved by the implicit, approximately factored scheme of Beam and Warming in the framework of multi-block grids. Computation of a twodimensional bifurcation flow was in excellent agreement with experimental measurements available in the literature for stream wise velocity profiles in the main duct. Then, effects of branch to main flow rate ratios and inlet Reynolds numbers on the main duct flowfields were studied in the laminar range. The computed results revealed significant influence of the branch flow rate ratio on the flow characteristics of T-branch.
김영목(Y.M. Kim) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
The base flow regions of a three-body sounding rocket containing multiple exhaust plumes were numerically investigated in three dimensions for a free stream Mach number of 2.7 at flight altitude 18.5 km. The flowfields were calculated using the full compressible Navier-Stokes equations with an one-equation turbulence model of Baldwin-Barth. The present calculations were executed based upon a chemically frozen, single perfect gas model assumption. Due to the symmetry of the three-body rocket of each single nozzle, only one fourth of the computational domain was considered for the analysis. The results indicate that a base heating effect is not considerable due to the small expansion of the plumes. In the base, however, a low speed recirculating flow dominates the region.
손채훈(C. H. Sohn),김영목(Y. M. Kim) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
Radiative heating of a liquid rocket base plane due to plume emission is numerically investigated. Calculation of flow and temperature fields around rocket nozzle precedes and thereby realistic plume shape and temperature distribution inside the plume are obtained. Based on the calculated temperature field, radiative transfer equation is solved by discrete ordinate method. The averaged radiative heat flux reaching the base plane is about 5㎾/㎡ at the flight altitude of l0.9㎞. This value is small compared with radiative heat flux caused by constant-temperature (1500K) plume emission, but it is not negligibly small. At higher altitude (29.8㎞), view factor between the base plane and the exhaust plume is increased due to the increased expansion angle of the plume. Nevertheless, the radiative heating disappears since the base plane is heated to high temperature (above l000K) due to convective heat transfer.
김치 발효에 관여하는 젖산균으로부터 Bacteriocin의 검색
조재선,정성제,김영목,전억한 경희대학교 부설 식량자원개발연구소 1994 硏究論文集 Vol.15 No.-
Lactic acid bacteria in Kimchi fermentation were tested for inhibitory activity against Gram positive bacteria and Gram negative bacteria. The Lactobacillus brevis (KCCM 35464) was found to produce a antimicrobial substance. It showed relatively wide range of inhibition spectrum against gram positive and gram negative bacteria and maintained the inhibitory activity between pH 4.0 and pH 9.0. The antimicrobial substance was obtained in the stationary growth phase and was purified by gel chromatography. The inhibitory effect of the antimicrobial substance on sensitive bacterial strains was determined by filter paper test. The activity of antimicrobial substance was stable at 75℃. On the basis of its electrophoretic pattern is SDS-PAGE, antimicrobial substance appeared as a single band of 59 KDalton.