摘要
研究多孔介质内部有热源的对流传热．用高阶差分研究在不同的渗流瑞利（Ｒａｙｌｅｉｇｈ）数Ｒａ下对流随时间进展的演化情况（为比较起见也适当考察倾斜角的影响）．Ｒａ计算到大约１６０００．结果表明：在Ｒａ较小时对流是稳定的，Ｒａ增大到４６００出现了非稳定的但为周期性的解．随着Ｒａ进一步增大，出现一些混沌窗口．对于有侧斜角的情形。
Convective heat transfer in a porous medium with uniform internal heat generation per unit volume q is studied. Evolution of convection with the lapse of time at various Rayleigh numbers is investigated by higher order defference techniques (effect of tilted angle is properly studied for comparison). Convection is computed up to about Ra=16 000 . The results show that the convection is stable at small Ra , and becomes periodic when Ra is increased to 4 600, as Ra is further increased there are some windows of chaos. For the tilting cases, intermittent phenomenon occurs.
出处
《力学学报》
EI
CSCD
北大核心
1997年第6期655-661,共7页
Chinese Journal of Theoretical and Applied Mechanics
基金
中国科学院渗流力学课题
关键词
自然对流
多孔介质
周期振荡
混沌
阵发性
convection, porous media, periodic oscillation, chaos, intermittent phenomenon
