垂直梯度磁场作用下水平薄层磁性液体自然对流传热

Natural Convective Heat Transfer Across Horizontal Thin Layer of Ferrofluids in vertical Non-uniform Magnetic Field

１前言磁性液体是吸附着表面活性剂的固体磁性颗粒（如Ｆｅ３Ｏ４）分散于基液（如水）中而形成的稳态胶体溶液。它能在重力、磁力及离心力等外力场的作用下不凝聚、不沉淀，是一种集流动性。强磁性于一体的新型材料。磁性液体在化工、机械、电子、动力及航天航空等领域有...

The natural convection heat transfer of water-based ferrofluids in a horizontal thin layerunder non-uniform vertical magnetic field was investigated in this paper. The results showed that whenthe non-uniform vertical magnetic field was applied in the same direction as that of the gravitationalforces, heat transfer enhancement was obtained, whereas, deterioration occurred in the oppositedirection. The heat transfer process could be controlled by the application of an external non-uniformvertical magnetic field. The natural convective heat transfer correlations of the ferrofluids in ahorizontal thin layer in a non-uniform vertical magnetic field were obtained from the experimental data.