B123 高プラントル数域における鉛直円筒内熱対流の流動様式

概要

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Natural convection in a cylindrical tube bounded by a partially-heated vertical wall is experimentally investigated for high Prandtl numbers (100<Pr<1000). The temperature and the flow fields are visualized by using thermo-sensitive liquid-crystal tracers and aluminum particles. As the Rayleigh number Ra increases, a transition occurs from steady axisymmetric flow to steady three-dimensional (3-D) flow. The 3-D flow dividing a circular cross-section changes from into two equal parts, into three and successively into nine. The number of divisions coincides with those of the hot rising plumes and the cold descending plumes. And at Pr=116,we can observe a different flow pattern with a nearly stagnant interior-core structure.
日本流体力学会の論文
2000-07-25