摘要
采用谱方法对流体横掠多孔介质层的流动稳定特性进行了研究。分析了雷诺数变化时特征值的运动轨迹和对应的特征值速度扰动分布,并进一步研究了临界雷诺数与渗透率之间的关系。结果表明:在渗透率较大时增大雷诺数会使特征值图谱中出现新的特征值,且新增加特征值对应的速度扰动分别发生在自由流体与多孔介质区界面处以及多孔介质区内,并且在较小渗透率下,临界雷诺数的数值变化较为明显,通道内流体的流动稳定性更好。
Through adopting the spectral collocation technique, the stability characteristics of fluid flowing though the porous medium was studied and the effect of the Reynolds number on the eigenvalues＇ trajectory and their perturbation distribution was analyzed, including the relation between the critical Reynolds number and the permeability. The results show that increasing the Reynolds number can incur new eigenvalues at a larger permeability value, and their corresponding velocity perturbations can occur at the interface between free fluid layer and porous medium layer as well as within the porous medium; and at a smaller permeability, an obvious variation of the critical Reynolds number can be observed along with a better stability of the fluid flowing in the channel.
出处
《化工机械》
CAS
2015年第5期653-657,共5页
Chemical Engineering & Machinery
基金
国家自然科学基金资助项目(51376041)
国家自然科学基金委员会应急管理项目(51476192)
关键词
多孔介质
线性稳定性
渗透率
porous medium, linear stability, permeability
