垂直な加熱平板に沿う強制 : 自然対向流共存対流の流動と伝熱(熱工学,内燃機関,動力など)

概要

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Opposing mixed convective flows induced around heated vertical plates were investigated experimentally. The experiments have been carried out with air and test plates of 100 and 200mm long. The flow fields over heated plates were visualized and the local heat transfer coefficients of the plates were measured in the wide range of the Reynolds and Rayleigh numbers; Re_L=7×10^2-1.5×10^4, Ra_L=9×10^6-8×10^8. The visual result shows that a separation of the boundary layer flow appears first at the trailing edge of the plate when the non-dimensional parameter (Gr*_L/Re^<2.5>_L)=0.35 and the separation point reaches to the leading edge when (Gr*_L/Re^<2.5>_L)=1.0. The heat transfer results show that the above flow separation retards the heat transfer significantly from that of the pure forced convection. It is also revealed that the flows over the heated plates can be categorized into forced, natural, and combined convection with the parameter (Gr*_L/Re^<2.5>_L).
社団法人日本機械学会の論文
2004-11-25