【摘要】 超导磁体系统产生的磁场力可抑制晶体生长过程中的自然对流,从而提高晶体结晶质量。通过理论分析,得到了实现微重力环境所要求的磁场强度分布。针对特定结构的超导磁体系统,数值模拟得到了不同晶体结晶过程中自然对流完全抑止所需要的线圈电流密度,以及工作空间内的磁场强度和磁加速度。以圆筒内水的自然对流为例,分别得到了重力作用下的流场和温度场,以及超导磁体系统微重力区内的流场和温度场。结果表明:通过特定的超导磁体结构和不同电流密度,可实现不同晶体结晶过程的微重力环境,达到抑止自然对流的目的。更多还原

【Abstract】 The magnetic Kelvin force generated by a superconducting magnet system can damp the natural convection during crystal growth and thus the crystal quality can be improved. The magnetic field used to generate micro-gravity environment was theoretically analyzed. Based on the specific setup of the superconducting magnet system, the magnetic accelerations as well as the magnetic field intensities were numerically simulated and the current densities in the coils required to generate micro-gravity for various crystal growth conditions were calculated. The flow fields and temperature fields were obtained for the water natural convections in the gravitational field only and in the micro-gravitational environment respectively. The results show that the micro-gravity environment during crystal growth can be achieved by the specific setup of the superconducting magnet system and the appropriate current densities in the coils.更多还原