Abstract: The wedge-shaped space of the gradient magnetic field composed of neodymium-iron-boron was set up and experimental research on the natural convection heat transfer of oxygen gas in enclosure was presented based on magnetothermal convection induced by the gradient magnetic field.The laser speckle interferometry image for the natural convection of oxygen gas was obtained and the local Nusselt numbers as well as the temperature field could thus be derived.The results showed that the natural convection of oxygen gas was enhanced by using the gradient magnetic field in which magnetic acceleration is almost identical with gravitational acceleration in direction.

摘要： 为验证梯度磁场作用下自然对流换热的变化规律，揭示热磁对流现象的机理，利用钕铁硼永磁体构建了楔形梯度磁场空间，并对位于该空间的封闭腔内的氧气自然对流换热进行了实验研究.实验获得了氧气自然对流的激光散斑干涉图像，通过数据处理得到了氧气自然对流的温度场，进而获得了壁面局部Nu分布.结果表明，磁加速度近似与重力加速度方向相同的永磁梯度磁场布置可使氧气自然对流换热过程得到强化.