邱克拉斯基结构液池内旋转驱动流动及转变  

FLOW AND TRANSITION DRIVEN BY ROTATION IN A MOLTEN POOL WITH CZOCHRALSKI CONFIGURATION

作　　者：吴春梅[1] 李友荣[1] 彭岚[1] 吴双应[1] 

机构地区：[1]重庆大学动力工程学院,重庆400044

出　　处：《工程热物理学报》2010年第7期1181-1184,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50776102)

摘　　要：为了了解旋转对邱克拉斯基(Czochralski)晶体生长结构液池内熔体流动的影响,利用有限差分法进行了三维非稳态数值模拟,坩埚外半径为50 mm,晶体半径为15 mm,液池深度为50 mm。结果表明,当旋转速度较低时,流动为稳态轴对称流动,随着转速的提高,流动会转化为三维非稳态振荡流动;晶体与坩埚同向旋转时,流动转化的临界转速较高,反向旋转时,临界转速较低;晶体单独旋转时,速度波周向速度远小于晶体旋转速度,坩埚单独旋转时,速度波周向速度与坩埚旋转速度保持一致;坩埚转速越快,速度波动幅度和波数越小。In order to understand the effect of rotation on flow transition in a molten pool with Czochralski configuration, a set of unsteady three-dimensional numerical simulations were carried out. The crucible radius rc=50 mm, crystal radius rs=15 mm and depth d=50 mm. The simulation results show that flow transits from stable axisymmetric state to three-dimensional oscillatory flow with increasing rotation rate. The critical rotation rate for co-rotation of the crystal and crucible is higher than that of counter-rotation. Furthermore, the propagation velocity of the azimuthal velocity wave is much slower than crystal rotation rate, but keeps consistent with the crucible rotation rate for the cases of crystal- and crucible-only rotation, respectively. With the increase of crucible rotation rate, the oscillation amplitude and wave number decrease.

关 键 词：旋转 对流 稳定性 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]