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단일(單一) 긴 수직평판(垂直平板)핀을 가진 수평전도관(水平傳導管)으로 부터의 자연대류(自然對流)
배대석,권순석,Bai, Dai Sok,Kwon, Sun Sok 대한설비공학회 1989 설비공학 논문집 Vol.1 No.1
Laminar natural convection heat transfer from a horizontal heat exchanger tube with one infinitely long vertical plate fin has been studied by a finite-difference numerical procedure. In predicting convective heat transfer from a circular tube, the thermal boundary condition at solid fluid interface is usually assumed to be isothermal. However, in reality, the thermal boundary condition is not isothermal, and the tube has the thickness and the conductivity. So the temperature at the interface is not known a priori to the calculation. This problem has the conjugate phenomena which occur between the tube conduction and external natural convection, and between the fin conduction and external natural convection. Numerical results are obtained to determine the effects of the conductivity of solid wall and the thickness of tube wall on heat transfer. It is found that the conduction causes significant influence on the natural convection heat transfer at low K and high ${\delta}$.
수평 비원형 환상공간에서의 자연대류에 관한 실험적 연구
배대석,이재신,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2
An experimental study has been carried out on natural convection in the annulus between horizontal non-circular cylinders. A Mach-Zehnder interferometer was used to determine temperature distributions and local heat-transfer coefficients. Results were obtained using air at atmospheric pressure with a diameter ratio D_(o)/D_(i)=2.6, and aspect ratio H/D_(i)=0.6 in range of Rayleigh number from 0.45×10⁴ to 1.98×10⁴, Comparisons between the existing numerical and present experimental results show good agreement.