平板乱流境界層に置かれた直列配列2立方体まわりの流れと局所熱伝達

概要

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Experimental studies were performed to investigate on the fluid flow and local heat transfer around two cubes arranged in tandem on a flat plate turbulent boundary layer. The Reynolds number based on the cube height d ranged from 4.0×10^3 to 3.2×10^4. The turbulent boundary layer thickness δ was δ/d≩2.17. The surface temperatures around the cubes were measured with thermocouples under the condition of a constant heat flux. The effect of spacing b between two cubes was cleared in the range of 0.33≨b/d≨1.33. In case of b/d≩0.67, the horseshoe vortex is formed in front of each cube, however it is not formed in front of the 2 nd cube at b/d=0.33. The local heat transfer is high in the horseshoe vortex regions and the reattachment regions. The average Nusselt numbers of 1 st and 2 nd cubes are expressed as follows;<Nu_1>^^^-=0.24 Re^<0.66> and <Nu_2>^^^-=0.27 Re^<0.64>respectively. They are almost constant with various spacing. However that of plate between two cubes has a maximum of <Nu_<p12>>^^^-=0.47 Re^<0.60> around b/d=0.67.
社団法人日本機械学会の論文
2000-07-25