狭い両面加熱垂直矩形流路の熱伝達特性

概要

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The effects of gap size on heat transfer characteristics were investigated experimentally for a vertical rectangular flow channel with a gap of 2.5 mm, 6 mm and 18 mm. As a result, the following was revealed. Flow shows the nature of forced convective heat transfer when Gr_x/Re^<21/8>_xPr^<1/2> is less than 2.5×10^<-4>, and the nature of free convective heat transfer when Cr_x/Re^<21/8>_xPr^<1/2> is higher than 1.8×10^<-3>, commonly for three gaps of flow channel. As for the data with a gap of 2.5 mm in the transition region between forced convection and free convection, it was confirmed that the higher heat transfer coefficient than that predicted by a heat transfer correlation for turbulent forced convection along a flat plate was owing to the acceleration of the main flow by the development of the boundary layer, not to buoyancy force.
社団法人日本機械学会の論文
1989-04-25