大孔隙率多孔介质内热弥散现象数值模拟-化工学报.PDFVIP

第65 卷 第3 期 化 工 学 报 Vol.65 No.3 March 2014 2014 年3 月 CIESC Journal ·870 · 大孔隙率多孔介质内热弥散现象数值模拟 陈仲山，解茂昭，刘宏升 （大连理工大学能源与动力工程学院，辽宁大连 116024 ） 摘要：采用Surface Evolver 泡沫演化动力学软件构建理想的大孔隙率多孔介质的几何模型：Weaire-Phelan 模型。 通过对有效热导率的计算，确定了该模型的适用范围。在此基础上优选两组几何参数作为计算依据，流体相分别 采用空气和水，固体相为铝T-6201，通过数值模拟，研究了孔径、Darcy 速度和流- 固热扩散系数比的影响。数值 计算结果表明：孔径越小，热弥散效应越强，流体本身的热物性对弥散的影响越明显；横向分量远小于纵向分量。 当工质为气体时，横向分量可以忽略不计，最后得到了计算纵向与横向热弥散系数的经验关联式。 关键词：多孔介质；数值模拟；模型；热弥散；孔隙率 DOI ：10.3969/j.issn.0438-1157.2014.03.015 中图分类号：TK 124 文献标志码：A 文章编号：0438—1157 （2014 ）03—0870—09 Numerical simulation of thermal dispersion in porous media with large porosity CHEN Zhongshan, XIE Maozhao, LIU Hongsheng (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China) Abstract: The structure of porous media with large porosity is described by a spatial periodic Weaire-Phelan model, which is built by the Surface Evolver software, and the application range of this model is determined by comparison of experimental data and simulation result for thermal effective conductivity. Based on the model, numerical computations on two specimens, with air and water as working fluids and aluminum T-6201 as solid matrix, are conducted. The effects of working parameters, such as pore size, Darcy velocity and ratio of thermal diffusion coefficient of fluid to solid, on the thermal dispersion are discussed. The simulation