中文摘要：

实验研究了烧结金属纤维板在大空间下的自然对流换热,分析了倾角、孔隙率、纤维丝经、Ra数和金属纤维导热系数对换热性能的影响。实验结果表明：存在最优的角度（60°左行）使烧结金属纤维板的自然对流换热性能最好,但倾斜角度对烧结金属纤维板的换热影响没有光板显著;加热面的平均Nu数随着纤维直径和孔隙率的增加均先增加后减小;在实验范围内,竖直方向的换热效果优于水平方向;金属纤维的导热系数对换热系数的影响明显,换热能力随着纤维导热系数增加而增加。采用多元回归技术开发了烧结金属纤维板大空间自然对流换热的无量纲换热准则关联式,且预测值和实验值的偏差在±7.5%内。

英文摘要：

In this study,experimental investigation of the natural convective heat transfer on sheet sintered with metal fiber at different inclination angles is presented.The effects of inclination angle,porosity,fiber diameter,Rayleigh number and thermal conductivity of metal fiber on natural convective heat transfer performance are discussed.It is founded that an optimal inclination angle （60°） exists which maximize the Nu number and the effect of inclination angle on the heat transfer performance for metal fiber sintered sheet is less significant than for the smooth sheet.The average Nusselt number firstly increases and then decreases with increasing of fiber diameter and porosity.The heat transfer rate in vertical orientation shows better performance than that in horizontal orientation. The metal fiber thermal conductivity has considerable influence on the heat transfer rate and the heat transfer rate appreciably increases with increasing of the metal fiber thermal conductivity.A heat transfer correlation for the present study is developed and the deviation between the predicted results and the experimental data is within±7.5%.