自然対流境界層における乱流熱伝達の促進(熱工学,内燃機関,動力など)

概要

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An experimental study on heat transfer enhancement for a turbulent natural convection boundary layer along a vertical flat plate has been performed by inserting two-dimensional flat plates (heat transfer promoters) into the boundary layer. The heat transfer rates markedly vary with the position, yaw angle and size of the promoters, and it is confirmed that the promoters are effective to control turbulent heat transfer characteristics of the natural convection boundary layer. Also, the visualization of flow with smoke and laser sheet and simultaneous measurements of the flow and thermal fields with hot- and cold-wires in the downstream region of the promoter have been conducted to clarify the cause of the increase in local heat transfer rates. As a result, it is observed that the low-temperature large vortices induced by the promoter invade very near the wall and the heat transfer enhancement occurs.
社団法人日本機械学会の論文
2003-08-25