当前位置: X-MOL 学术Sādhanā › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Convective transport around two rotating tandem circular cylinders at low Reynolds numbers
Sādhanā ( IF 1.6 ) Pub Date : 2020-05-07 , DOI: 10.1007/s12046-020-01358-6
Dipankar Chatterjee , N V V Krishna Chaitanya

The convective transport around two rotating circular cylinders kept in a tandem configuration to an unconfined flow of an incompressible fluid (Prandtl number, Pr = 0.717) is investigated through two-dimensional numerical simulation. The flow Reynolds number is considered constant at Re = 100. Four different gap spacings between the tandem cylinders such as 0.2, 0.7, 1.5 and 3.0 are chosen for simulation. The cylinders are rotating about their centroidal axes for a range of dimensionless speed \( \left( {0 \le \Omega \le 2.75} \right) \). The rotation to the objects causes the unsteady periodic flow around them to become stabilized and at some critical rotational speed, the vortex shedding stops completely resulting in a steady flow pattern. The critical speed of rotation at which the vortex shedding completely stops is a function of the cylinder spacing. Overall, it is observed that increasing the gap increases the critical rotation rate. The thermal fields are also strongly stabilized as a result of the cylinder rotation. The rotating cylinders actually create a zone in their proximity which acts like a buffer to the convective transport. The conduction mode of heat transfer predominates in these regions causing the heat transfer rate to assume a decaying pattern with increasing the rotational speed at all cylinder spacings.



中文翻译:

在低雷诺数下绕两个旋转的串联圆柱体的对流传输

 通过二维数值模拟研究了围绕两个旋转的圆柱体的对流输运,这些圆柱体以串联配置到达不可压缩流体的无侧限流动(Prandtl数,Pr = 0.717)。雷诺数在Re = 100时被认为是恒定的。在串联气缸之间选择了四个不同的间隙间距,例如0.2、0.7、1.5和3.0进行模拟。圆柱体绕其质心轴旋转一定范围的无量纲速度\(\ left({0 \ le \ Omega \ le 2.75} \ right)\)。物体的旋转会导致围绕它们的不稳定的周期性流动变得稳定,并且在某个临界转速下,涡旋脱落完全停止,从而形成稳定的流动模式。涡旋完全停止的临界转速是气缸间距的函数。总的来说,观察到间隙的增加会增加临界转速。由于气缸旋转,热场也得到了强烈稳定。旋转的圆柱体实际上在其附近创建了一个区域,该区域的作用就像对流传输的缓冲。在这些区域中,传热的传导模式占主导地位,从而导致在所有气缸间距下,随着转速的增加,传热速率呈现衰减模式。

更新日期:2020-05-07
down
wechat
bug