CAJ | 학술논문

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。
채용Surface Evolver포말연화동역학연건구건이상적대공극솔다공개질적궤하모형：Weaire-Phelan모형。통과대유효열도솔적계산，학정료해모형적괄용범위。재차기출상우선량조궤하삼수작위계산의거，류체상분별채용공기화수，고체상위려T-6201，통과수치모의，연구료공경、Darcy속도화류-고열확산계수비적영향。수치계산결과표명：공경월소，열미산효응월강，류체본신적열물성대미산적영향월명현；횡향분량원소우종향분량。당공질위기체시，횡향분량가이홀략불계，최후득도료계산종향여횡향열미산계수적경험관련식。
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 result shows that smaller diameter and stronger dispersion result in a more sensible dependency on thermal physical properties. In addition, the transversal component is far smaller than the longitudinal one. Empirical correlations for the longitudinal and transversal thermal dispersion are obtained in term of Peclet number.