温度差を有する鉛直流路内での混合対流熱伝達特性(熱工学,内燃機関,動力など)

概要

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In this paper, numerical and experimental investigation on natural and mixed convection heat transfer in a vertical duct with asymmetric side-wall heating has been carried out. The present study is triggered by a possible thermal insulation created on the cold wall in a vertical duct via an upward forced flow. We discuss how the velocity and temperature of forced flow influences the cold-wall average Nusselt number. It was found that two critical values of Reynolds number exist. One is associated with flow structure (Re^FS_cr), and causes the disapperance of natural convection cell. The other gives the critical value on heat transfer (Re^HT_cr), which makes cold-wall effectively insulated. The latter is found independent of Ra and only dependent of aspect ratio scaled as Re^HT_cr ∝ A^2.
一般社団法人日本機械学会の論文
2002-01-25