液态泡沫铝合金泡孔长大与析液过程的数值模拟  

Numerical simulation of bubble size distribution of aluminum foams in liquid state

作　　者：解茂昭[1] 李科[1,2,3] 

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024 [2]内蒙古科技大学能源与环境学院,内蒙古包头014010 [3]清华大学航天航空学院,北京100084

出　　处：《江苏大学学报（自然科学版）》2010年第4期427-431,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50876017);内蒙古科技大学创新基金重点项目(2009NC004)

摘　　要：建立了一个描述液态泡沫铝合金中气泡分布随时间变化的数学模型,其中同时考虑了气泡间气体扩散和析液过程的影响,即耦合求解泡沫尺寸分布方程和一维析液方程,从而得出泡沫中气泡孔径分布随时间的变化规律.通过与液态铝泡沫试验结果的对比验证了该模型的正确性.计算结果表明泡径随时间以指数规律增长,这与MacPherson等人新近的理论结果相符合.研究了初始液体体积分数、表面张力、亨利常数、扩散率等因素对泡沫尺寸分布演化的影响.结果表明:表面张力越大、亨利常数越大,泡沫尺寸演化过程越剧烈.A mathematical model for predicting the evolution of bubble size distribution was presented, which took into account of the effects of both the coarsening due to gas diffusion between bubbles and the liquid drainage. A bubble size distribution equation and a one-dimensional drainage equation were solved coupled by a finite difference approach. Comparison with experimental results from the literature shows a reasonable agreement. The model predictions indicate that the bubble size increases exponentially with time which is in good agreement with MacPherson＇s theory. Further computational results reveal that bubble size distributions are dependent strongly on the drainage behavior, the Henry constant, gas diffusivity and surface tension of the aluminum foam in liquid state.

关 键 词：泡沫铝 析液 孔径分布 液体体积分数 多面体 

分 类 号：TU51[建筑科学—建筑技术科学] TK121[动力工程及工程热物理—工程热物理]