曲り円管内助走区間における共存対流熱伝達

概要

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Experimental and numerical investigations have been made on laminar convective heat-transfer in thermal entrance region of curved tubes. In heat transfer experiment, the parameters are set to be D_e=100〜2000 and R_eR_a≦6×10^4 for non-buoyant effect, while mixed effects of buoyant and centrifugal forces are examined by increasing the value of R_eR_a upto 1×10^6 keeping D_e=100. The secondary flow pattern in the mixed convection region are visualized. Numerical calculation of the set of three dimensional parabolic type equations is extended over the ranges of D_e=20〜1000 and R_eR_a=0〜5×10^6 for P_r=0.7. The case with P_r=5 is also examined. Differences between cooling and heating of water are explained taking account of the temperature dependence on viscosity. Flow behavior of the results reveals the special characteristics of thermal entrance and hydrodynamic entrance regions which can be categorized into three types. A set of correlations suitable for the three indivisual heat transfer regions is proposed for thermally fully developed region.
一般社団法人日本機械学会の論文
1984-04-24