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윤병택(Byeong-Taek Yun),최도형(Do Hyung Choi) 한국전산유체공학회 1996 한국전산유체공학회 학술대회논문집 Vol.1996 No.-
In this study, the mixed convective heat transfer phenomena in a three-dimensional channel with periodic heat-generating block is studied. An object is to analyze the flow field and temperature distribution in the PCB with conducting wall. Adiabatic wall boundary condition and conducting wall boundary condition(periodic boundary condition) are studied.
박일석(Il-Seouk Park),최도형(Do Hyung Choi) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
A numerical investigation for the flow, heat and mass transfer characteristics of the grooved evaporating tube with the films flowing down on both the inside and outside tube walls has been carried out. The condensation occurs along the outside wall while the evaporation takes place at the free surface of the inside film. The 3-D transport equations for momentum and energy are solved by using the FVM(Finite Volume Method), The free surface shape is tracked by the moving grid technique satisfying the SCL(Space Conservation Rule). Due to the secondary motion of the fluid, the film thins at the crest, while thickens at the valley. The velocity and temperature fields as well as the amounts of the 'condensed and evaporated mass have been successfully predicted for various operating conditions and groove shapes.
격자 볼츠만 방법 방법(Lattice Boltzmann Method)을 이용한 다공성 매질내에서의 열전달 특성 특성에 관한 연구
황중기(Joong-Ki Hwang),최도형(Do-Hyung Choi),손일헌(Il-Heon Son),이덕락(Duk-Lak Lee),임성욱(Seong-Wook Yim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The heat/mass transfer characteristics of a porous medium in two and three-dimensions are investigated by using the Lattice Boltzmann Method to analyze the ball packed-bed regenerator of reheating furnace in steel rolling process. To obtain the bulk properties of the porous medium of various structures, calculations have been performed for porous media of regularly distributed inclusions.. It is found that the thermal dispersion is influenced by the medium structures, the Peclet number, the volume fraction of the solid, the thermal conductivity ratio of the solid and the fluid, and the Reynolds number. The streamwise thermal dispersion coefficients increase with the Peclet number, the volume fraction of the solid, the Reynolds number, and the thermal conductivity ratio of the fluid to the solid. The parameter that affects the thermal dispersion most is the Peclet number
Perturbation 방법에 기초한 2 차원 제트의 자유표면 결정
안진수(Cheensu An),추정호(Jeongho Chu),최도형(Do Hyung Choi),김만회(Man-hoe Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Numerical algorithm to determine the free-surface profile, which is expressed as a function of the distance measured from the exit plane, has been developed. Perturbation of stream function, which makes the solution satisfy both the kinematic and dynamic boundary conditions, is obtained for an assumed free-surface profile. The stream function is then modified iteratively by the successive solutions of perturbation function. For the two-dimensional jet flow, the present results are seen to compare excellently with those by other methods.
Computation of the Slow Viscous Flow about a Circular Arc
추정호(Jeong-ho Chu),김문언(Moon-Uhn Kim),최도형(Do Hyung Choi) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
와도-유량함수를 이용하여 원호 주위를 흐르는 점성류를 레이놀즈 수 30까지 계산하였다. 점점 주위에서 발산하는 와도를 원호의 곡률 특성을 잘 표현하는 국소점근식을 이용하여 해석적으로 처리하였다. 그리고, 물체로부터 멀리 떨어진 곳에서는 물체가 받는 힘과 관련이 있는 Oseen 유동을 이용한 경계조건을 사용하였다. 이러한 해석해와 수치해의 접합으로 여러 입사각의 유동에 대한 원호 주위에서 박리를 보다 안정적이고 효율적으로 고찰하였다.