不同旋转条件下多孔介质中自然对流的稳定性分析  

Stability analysis of natural convection in porous medium under different rotating conditions

作　　者：夏婕[1] 常海萍[1] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《中国科学技术大学学报》2006年第6期646-650,共5页JUSTC

基　　金：国家自然科学基金(50276027);国防基础科研项目(J1400D001)资助

摘　　要：对离心力场下多孔介质中的自然对流进行了线性稳定性分析,考虑了离心力、哥氏力与重力的共同作用.结果表明:当离心力与温度梯度垂直时,多孔介质中将发生离心力、重力与哥氏力共同驱动的无条件自然对流;当离心力与温度梯度平行时,多孔介质中将发生离心力、重力与哥氏力共同驱动的有条件自然对流,并且重力与哥氏力对自然对流的稳定性判据均无影响.The analytical method of linear stability was applied to the natural convection in porous medium considering the action of gravity, centrifugal and Coriolis forces together in a centrifugal force field. The results show that when temperature gradients are perpendicular to the centrifugal force, unconditional natural convection induced by gravity, centrifugal and Coriolis forces in porous medium will occur. However, when temperature gradients are collinear with the centrifugal force, conditional natural convection induced by gravity, centrifugal and Coriolis forces in porous medium will occur. Furthermore, gravity and Coriolis forces have no effect on the stability criterion of natural convection.

关 键 词：多孔介质 自然对流 稳定性 旋转 封闭腔体 

分 类 号：TK124[动力工程及工程热物理—工程热物理]