【摘要】 本文基于磁流体动力学模型，通过数值模拟的方法，研究了垂直外部磁场对熔盐在绝缘管内流动传热特性的影响，考察了速度、湍流强度和Nu等参数随磁场变化的关系。结果表明，磁场作用会使流动分布出现各向异性，导致湍流度和主流速度降低，垂直于磁场方向的Hartmann层的速度及湍流度提高，随着磁场强度增大，这种趋势更明显。在均匀磁场和正梯度磁场作用下，管壁平均Nu数有所提高，而逆梯度磁场作用下的管壁平均Nu数有所减弱。更多还原

【Abstract】 In this paper, the effect of a perpendicular external magnetic field on the heat transfer characteristics of molten salt flowing in an insulated tube is investigated by numerical simulation based on a magnetohydrodynamic model, and the relationship between parameters such as velocity,turbulence intensity and Nu with the variation of magnetic field is examined. The results show that the magnetic field causes anisotropy in the flow distribution, leading to a decrease in molten salt turbulence and mainstream velocity, and an increase in velocity and turbulence in the Hartmann layer region perpendicular to the magnetic field direction. This trend becomes more pronounced as the magnetic field intensity increases. The average Nu number of the tube wall increases under the effect of uniform magnetic field and positive gradient magnetic field, while the average Nu number of the tube wall decreases under the effect of inverse gradient magnetic field.更多还原