タービュレンスプロモータによる長方形管内強制対流熱伝達の促進 : 第2報、無孔板・多孔板・半多孔板プロモータ付き伝熱面の性能比較

概要

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High-performance surfaces for forced convection heat transfer using turbulence promoters were tested in a rectangular channel. Flow friction and heat transter characteristics were measured for air flow with Reynolds number between 10^4 and 2×10^5. Three types of turbulence promoters, plain rib type, perforated rib type and half-perforated rib type, were tested. Performance comparison was made of the heat transfer ability of the surfaces with these three types of turbulence promoters under the condition of constant pumping power. The surfaces with perforated rib type and half perforated rib type turbulence promoters were found to show excellent performance. Especially, the half-perforated rib type promoter with 10% porosity showed the best heat transfer and flow performance. Mechanism of heat transfer enhancement was investigated by measuring the local heat transfer coefficient. It was concluded that the superposition of the effects of flow through the perforations and reattachment of flow coming over the promoter was the cause of the excellent performance.
一般社団法人日本機械学会の論文
1984-03-28