以去离子水和 w(Fe₃O₄) =0. 5%的磁纳米流体为实验工质，在 3 种不同尺寸的矩形微细通道内进行饱和流动沸腾传热实验，研究了流动沸腾传热过程中质量流速、有无磁场作用下的磁纳米流体对 CHF 特性的影响． 结果表明:去离子水和0. 5%的磁纳米流体的 CHF 值均随质量流速的增大而增大，且质量流速较小时，CHF 值增幅较明显;无外加磁场时，0. 5%的磁纳米流体的 CHF 值相比去离子水可提高 71% ～157%;0. 5% 的磁纳米流体的 CHF 值随着磁场强度的增加而增大，增加幅度约为 4% ～17. 4%;将实验值与 Kosar 模型预测值进行对比，发现工质为去离子水和 0. 5% 的磁纳米流体时平均绝对误差分别为 25%、30%，而对 Kosar 模型进行修正后，平均相对误差均小于15%，实验结果预测性明显提高．

The deionized water and w(Fe₃O₄) =0. 5% of magnetic nano-fluids were taken as the working fluids to perform saturated flow boiling transfer heat experiments in the three different sizes of rectangular micro-channels．And the effect on the characteristics of CHF by nano-fluids was considered mass flow rate and magnetic field in the process of the flow boiling transfer heat was explored． The experimental results shows that the CHF values of deioni-zed water and 0. 5% magnetic fluid both increase with the increased mass flow rate． And the increase of CHF value is relatively obvious when the mass flow rate is low． The CHF values of 0. 5% of magnetic nano-fluids can be in-creased by approximately 71% ～157% than deionized water when there is no magnetic field． The CHF values of 0. 5% of magnetic fluid increase with magnetic field strengthening and the increase rate is about 4% ～ 17. 4%．Compared the experimental values with the predicted values of Kosar model，the MAE values of deionized water and magnetic fluid are 25% and 30% respectively． After the modification of Kosar model，the MAE values are both less than 15%． Obviously，the prediction of the experimental results is improved．