Numerical simulation of slit wall effect on the Taylor vortex flow with radial temperature gradient
Numerical simulation of slit wall effect on the Taylor vortex flow with radial temperature gradient
复制标题
径向温度梯度泰勒涡流缝壁效应数值模拟
DOI：
10.5293/ijfms.2015.8.4.304
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发表时间：
2015-12
影响因子：
--
通讯作者：
Cheng Tang
中科院分区：
文献类型：
--
作者：
Changqing Chao;Fangneng Zhu;Xiqiang Han;Cheng Tang
摘要采用数值模拟方法研究了径向温度梯度恒定的同心圆柱体内的泰勒涡流动。PIV实验结果验证了数值模拟方法的可靠性。比较了平面模型和12缝模型在不同轴向位置的径向速度和温度分布，得到了不同工况下圆筒内壁的热流密度分布。在平面模型中，内筒的平均表面热流密度随内筒转速的增大而增大。在缝隙模型中，缝隙壁面明显改变了环隙内的流场和温度分布，径向流动明显加强，在相同的工况下促进了换热过程。关键词：泰勒涡流、缝隙壁、温度梯度、换热、数值模拟1.1923年，Taylor[1]在导言中发现了两个相对旋转的同心圆柱体之间的环隙中存在二次流，这种二次流称为Taylor-Couette流。此后，许多学者对其进行了深入的研究。杨[2]用流动显示的方法研究了Taylor-Couette流动的过渡过程，加入铝粉考察了流场的稳定性，发现随着转速的增加，铝粉颗粒在过渡到Taylor涡流之前有轴向运动。Kedia等人[3]研究了换热对Taylor-Couette流动的影响，发现在轴对称Taylor涡流区，换热随Grashof数的增加而减小，当流动变为非轴对称时，换热随Grashof数的增加而增加。Lee和Minkowycz[4]利用萘升华技术研究了两个同心短圆柱体之间的环形缝隙内的换热特性，这两个圆柱体有两个壁或一个平面和一个轴向缝隙壁，得到了关于热传递的定性信息，但没有解决环形缝隙内的流动现象。刘[5]用粒子图像测速仪研究了轴向壁缝对同心圆柱缝隙内泰勒涡流动的影响，发现缝隙壁的存在加速了过渡过程。
Abstract Numerical simulation was applied to investigate the Taylor vortex flow inside the concentric cylinders with a constant radial temperature gradient. The reliability of numerical simulation method was verified by the experimental results of PIV. The radial velocity and temperature distribution in plain and 12-slit model at different axial locations were compared, and the heat flux distributions along the inner cylinder wall at different work conditions were obtained. In the plain model, the average surface heat flux of inner cylinder increased with the inner cylinder rotation speed. In slit model, the slit wall significantly changed the distribution of flow field and temperature in the annulus gap, and the radial flow was strengthen obviously , whichpromote d the heat transfer process at the same working condition. Keywords : Taylor vortex flow, Slit wall, temperature gradient, heat transfer, numerical simulation 1. Introduction In 1923, Taylor[1] discovered the secondary flow existed in the annulus gap between two relatively rotating concentric cylinders, which is called Taylor-Couette flow. Since then, a lot of scholars carried out in-depth research on it. Yang[2] studied the transition process of Taylor-Couette flow by flow visualization method, the aluminum particles were added to investigate the stability of flow field, they found as the rotation speed increased, the aluminum particles have the axial motion before the transition to Taylor vortex flow. Kedia et al.[3] studied the effects of heat transfer on Taylor-Couette flow, and found the heat transfer decreased with Grashof number in axisymmetric Taylor vortex flow regime, and increased with Grashof number after the flow becomes non-axisymmetric. Lee and Minkowycz [4] studied heat transfer characteristics by using the naphthalene sublimation technique in the annular gap between two short concentric cylinders which had either two walls or one plain plain and one axially slit wall, and yielded qualitative information regarding heat transfer but did not address the flow phenomena inside the annular gap. Liu[5] studied the axial wall slits effect on the Taylor vortex flow in the gap between two concentric cylinders by Particle Image Velocimetry, and found the existence of slit wall accelerated the transition process.
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影响因子：
--
作者：
R. Kedia;M. Hunt;T. Colonius
通讯作者：
R. Kedia;M. Hunt;T. Colonius
DOI：
10.1098/rsta.1923.0008
发表时间：
1923-01-01
影响因子：
--
作者：
Taylor, GI
通讯作者：
Taylor, GI
DOI：
10.5293/ijfms.2012.5.2.060
发表时间：
2012-06
影响因子：
--
作者：
Liu Dong;Y. Xiaoyong;Ding Jian;kim Hyoung-Bum
通讯作者：
Liu Dong;Y. Xiaoyong;Ding Jian;kim Hyoung-Bum
影响因子：
--
作者：
HAYASE, T;HUMPHREY, JAC;GREIF, R
通讯作者：
GREIF, R
DOI：
10.1016/j.ijheatfluidflow.2010.08.003
发表时间：
2011-02
影响因子：
2.6
作者：
Sébastien Poncet;S. Haddadi;S. Viazzo
通讯作者：
Sébastien Poncet;S. Haddadi;S. Viazzo