大きな水平加熱円柱まわりの自然対流の流動と伝熱 : 空気の場合

概要

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Fluid flow and heat transfer of natural convection around large horizontal cylinders were investigated experimentally. The main concerns were the turbulent transition and its influence on the local heat transfer. The experiments were performed in the range of modified Rayleigh numbers from 1.0×10^8 to 5.5×10^<11>. The test fluid was air. The flows over cylinders were visualized with smoke. The results show that three dimensional separation occurs over the surface when the Rayleigh numbers exceed 3.5×10^9. The separation becomes a trigger to the turbulent transition, and transitional and turbulent flows appear downstream the separation. The local heat transfer coefficients were also measured. The results show that the coefficients are increased significantly in the transitional and turbulent regions.
社団法人日本機械学会の論文
1999-03-25