室温磁制冷机主动式回热器强化传热数值仿真

Heat transfer numerical analysis of magnetic refrigerator AMR for room temperature application

研究了脉冲磁场作用下磁工质粉末与水高热流密度小温差强化传热,提出了在工质轮中嵌入高导热材料强化传热的方法,采用建立理论模型与Ansys软件相结合的方法,对几种典型嵌入形式进行了模拟分析,结果表明,铜丝的交叉排列最有利于温度的均匀分布,在高转速运行下磁制冷机铜丝网的强化换热作用明显。铜丝数量的增加导致Gd工质质量减少,从而导致磁致热效应的减少,铜丝数量、磁热效应以及制冷效率之间存在最优值。

The large heat flux and small temperature difference heat transfer behavior between the magnetic material and water were numerically investigated under the effect of pulse magnetic field. A method of set copper wires＇ in active magnetic regenerator（ AMR） aiming to enhance heat transfer was studied. Simulation and analysis of several typical insert ways of copper wires distribution were described in details. The resuh indicated that copper wires intersecting to each other was the best way for temperature field uniform distribution, heat transfer obviously improved on condition of high rotary velocity and it was feasible to use copper wires to enhance heat transfer in AMR bed. The carrot magnetic effect would decrease as the copper wires number increase. There should be an optimum value taking the copper number, carrot magnetic effect and refrigeration efficiency into account.