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이재신,박언세,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
Mixed convection heat transfer is investigated by numerical solution of Navier-Stokes and energy equations for and isothermal rectangular beam. The solutions have been obtained for aspect ratios of beam, W=0.3~3, Reynolds numbers, Re=50~150 and Grashof numbers, Gr=0~5×10⁴. The results indicate that as Re increases, the mean back surface Nusselt number decreases to Re=120 for W=0.3 and Re=95 for W=1, 3 and then increases. Independent of aspect ratios of the beam, the mean beam Nusselt number at Gr=10⁴ shows similar value in the region of mixed convection. The mean beam Nusselt number distribution for W=0.3 shows the highest value at Gr/Re²≤1.0 and that for W=3 at Gr/Re²〉1.0. Comparison between the experimental and numerical results shows good agreement.
이재신,양성환,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.1
Mixed Convection Heat Transfer are investigated in a two-dimensional channel with isothermal square beams attached to an adiabatic plate by numerical method. The solutions have been obtained for dimensionless beam spacings, S/L=1∼3, aspect ratios of beam, B/H=1∼4, Reynolds numbers, Re=20∼500 and Grashof numbers, Gr=0~10^(5). The results indicate that as S/L increases, the total mean Nusselt number increases. The total mean Nusselt number for a horizontal channel is same value at Gr/Re²=0, higher at 0<Gr/Re²≤3.5 and lower at 3.5<Gr/Re²≤10 than that for a vertical channel.