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首页> 外文期刊>International Journal of Heat and Mass Transfer >The influence of heat on the 3D-transition of the von Karman vortex street
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The influence of heat on the 3D-transition of the von Karman vortex street

机译：热量对von Karman涡街的3D过渡的影响

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The wake behind a horizontally mounted heated cylinder with circular cross-section is visualised using an electrochemical tin precipitation method. In the experiments Re_D and Ri_D both based on main stream properties, were set to 117 and varied between 0 and 1.5, respectively. The wake becomes 3D from Ri_D ≈ 0.3. For small Richardson values (Ri_D < 1), the warm fluid is initially collected in the coherent vortex structures shed from the cylinder. Further downstream thermal plumes originate from these structures. For larger Richardson values (Ri_D > 1), the upward buoyancy force seems to prevent the formation of the coherent vortex structures and the plumes are already formed close behind the cylinder. The spanwise positions at which the plumes originate, are determined by the occurrence of 3D flow structures at the rear end of the cylinder. The distance between these structures is typically 1.8D and independent of the Richardson number.
机译：使用电化学锡沉淀法可以观察到水平安装的圆形横截面加热圆筒后面的尾流。在实验中，基于主流属性的Re_D和Ri_D均设置为117，并且分别在0和1.5之间变化。唤醒从Ri_D≈0.3变为3D。对于小的Richardson值（Ri_D <1），最初将温暖的流体收集在从圆柱体喷出的相干涡结构中。进一步的下游热羽起源于这些结构。对于较大的Richardson值（Ri_D> 1），向上的浮力似乎阻止了相干涡结构的形成，并且羽流已经在圆柱体后部附近形成。羽流产生的翼展方向位置由圆柱体后端的3D流动结构确定。这些结构之间的距离通常为1.8D，与理查森数无关。

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