Mixed convection in horizontal duct flow with transverse magnetic field and heating of side wall
Mixed convection in horizontal duct flow with transverse magnetic field and heating of side wall
复制标题
DOI：
10.1063/1.4896299
复制
发表时间：
2014-09
影响因子：
4.6
通讯作者：
Xinyuan Lv;O. Zikanov
中科院分区：
文献类型：
--
作者：
Xinyuan Lv;O. Zikanov
对水平横向磁场很强(哈特曼数高达800)的水平管道和电绝缘管壁中的混合对流进行了计算研究。强恒速加热(Grashof数Gr高达109)应用于一面垂直墙，而其他墙是隔热的。结果表明，在较宽的Ha和Gr范围内，流动是二维的(沿流向均匀)和定常流动。在类似的具有底部加热的管道和管道中，没有观察到对流滚流与最近检测到的磁场对齐的不稳定性。速度场是横向平面内对流修正的流向流动和对流诱导环流的组合。环流的显著特征是加热和水平壁附近有较强的急流。结果表明，在雷诺数不变的情况下，流动的整体特征和空间结构可以近似地由Gr/Ha~2作为单一参数来确定。我们还给出了几种常用的网格聚类法在强磁场壁面流动中应用的系统比较研究结果。
Computational study of mixed convection in a horizontal duct with very strong (Hartmann numbers Ha up to 800) horizontal transverse magnetic field and electrically insulated walls is conducted. Strong constant-rate heating (Grashof numbers Gr up to 109) is applied to one vertical wall, while the other walls are thermally insulated. It is found that in a wide range of Ha and Gr the flow is two-dimensional (uniform in the streamwise direction) and steady-state. No instability to convection rolls aligned with the magnetic field detected recently in a similar duct and pipe with bottom heating is observed. The velocity field is a combination of convection-modified streamwise flow and convection-induced circulation in the transverse plane. The circulation has strong jets near the heated and horizontal walls as prominent features. It is demonstrated that, at a constant Reynolds number, integral characteristics and spatial structure of the flow can be approximately considered as determined by Gr/Ha 2 as a single parameter. We also present results of a systematic comparison study of several commonly used grid clustering schemes in their application to wall-bounded flows with strong magnetic fields.