Mechanisms of onset for moderate Mach number instabilities of viscoelastic flows around confined cylinders
Mechanisms of onset for moderate Mach number instabilities of viscoelastic flows around confined cylinders
复制标题
受限圆柱体周围粘弹性流的中等马赫数不稳定性的发生机制
DOI：
10.1007/s00397-015-0875-6
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发表时间：
2015
期刊：
影响因子：
2.3
通讯作者：
G. Christopher
中科院分区：
文献类型：
--
作者：
Xueda Shi;Stephen Kenney;Ganesh Chapagain;G. Christopher
提出了对圆柱体周围高度受限和有界粘弹性流发生的上游和下游不稳定性的检查。使用弹性数-马赫数 (El-Ma) 相空间来证明下游不稳定性在 Ma = 1 时开始；这些不稳定性是由行进弹性波对基流的扰动引起的。下游不稳定出现后，Macrit ~ 10最终出现上游不稳定；然而，这个数字受到通道几何形状和流体特性的影响。上游不稳定性是由下游不稳定性引起的流场扰动引起的，并且直到超过给定速度下的临界扰动大小时才会发生。这些流态对流阻的影响通过检查过压降来表征；在上游不稳定开始时观察到流阻显着增加。
An examination of the upstream and downstream instabilities that occur for highly confined and bounded viscoelastic flows around a cylinder is presented. An elasticity number-Mach number (El-Ma) phase space is used to demonstrate that the onset of downstream instabilities at Ma = 1; these instabilities are instigated by the disturbance of the base flow by traveling elastic waves. After the onset of the downstream instability, an upstream instability eventually occurs for Macrit ~ 10; however, this number is affected by both channel geometry and fluid properties. The upstream instability is instigated by perturbations of the flow field caused by the downstream instability and does not occur until a critical perturbation size at a given velocity is exceeded. The effects of these flow regimes on flow resistance are characterized by examining excess pressure drop; a significant increase in flow resistance is observed at the onset of the upstream instability.
影响因子：
8.6
作者：
Grilli, Muzio;Vazquez-Quesada, Adolfo;Ellero, Marco
通讯作者：
Ellero, Marco
DOI：
10.1021/la803413x
发表时间：
2009-07-07
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
Hohne DN;Younger JG;Solomon MJ
通讯作者：
Solomon MJ
DOI：
10.1016/j.expthermflusci.2014.03.004
发表时间：
2014-11-01
影响因子：
3.2
作者：
Galindo-Rosales, Francisco J.;Campo-Deano, Laura;Pinho, Fernando T.
通讯作者：
Pinho, Fernando T.