本文导出了基于逾渗理论并考虑温度影响的散体有效导热系数预测模型.针对孔隙中流体的传热机理,诠释了无量纲参数φ的物理意义.对SiC、SiO2和煤灰等散体材料在自行研制的实验系统上采用断电热线法测量了其在50～600℃范围内的有效导热系数.结果表明:实验值与模型预测值吻合良好,这三种散体材料的有效导热系数都随温度的增加而增大.
参考文献
| [1] | 赵晓彤 .基于分形和逾渗的散体热导率模型研究[D].保定:华北电力大学,1998. |
| [2] | Rezaei HR.;Bryant GW.;Hart JT.;Liu GS.;Bailey CW.;Wall TF. Miyamae S.;Makino K.;Endo Y.;Gupta RP. .Thermal conductivity of coal ash and slags and models used[J].Fuel,2000(13):1697-1710. |
| [3] | Park S;Hartley J G .Predicting Effective Thermal Conductivities of Unbonded and Bonded Silica Sands[J].Journal of Applied Physics,1999,86(09):5263-5269. |
| [4] | 张海林,杨善让,徐志明,王升龙,白立新.提高重整化群精度的一个尝试[J].工程热物理学报,2003(06):992-994. |
| [5] | Yang Shanrang;Zhang Hailin;Xu Zhiming.Determination of fouling thermal conductivity of ash layer on heating surface[A].,2002:423-428. |
| [6] | Zumbrunnen D A;Viskanta R;Incropera F P .Heat Transfer Through Porous Solids with Complex Internal Geometries[J].International Journal of Heat and Mass Transfer,1986,29(02):275-284. |
| [7] | Devpura A;Phelan P E;Prasher R S.Percolation Theory Applied to the Analysis of Thermal Interface Materials in Flip-Chip Technology[A].IEEE,2000:21-28. |
| [8] | Yang Shanrang;Zhang Hailin;Xu Zhiming.Thermal Conductivity of Ash Layer Including Radiative Heat Transfer[A].Guangzhou: South China University of Technology Press,2004:992-998. |
| [9] | Gouyet J F.Physics and Fractal Structure[M].Paris:Masson & Springer,1996 |
| [10] | 张忠进;郎敏 .断电热线法测试材料导热系数的研究[J].东北电力学院学报,1995,15(04):16-20. |
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