摘要
根据混沌对流的流动特点,基于混沌动力学中的李雅普诺夫指数的数值计算,提出了混沌对流中扩散性的数值计算方法。将此法应用于混沌结构与普通结构的混沌对流与普通流中,分析了2种流体的扩散指数,并对照其传热特性,讨论了各流态中的流体扩散特性对传热强化的影响。结果认为,混沌结构流道内的流体扩散强度随着Re的增大而线性增大,同种混沌结构内流体的扩散性随流体流速线性增大,相对于普通层流,混沌对流的扩散性提高了流体宏观运动能携带热量的能力,强化了流体间的传热。
Based on the Lyapunov exponent calculation of chaotic dynamics,the flow characteristics of chaotic convection and the numerical calculation of Lyapunov exponent in chaotic dynamics,the method for the numerical calculation of the diffusivity of chaotic convection is formulated. Applying the method to the chaotic convection and general convection of chaotic structure and general structure,the diffusive exponent of two fluids is analyzed. Referring to the heat transfer characteristics,the effect of the fluid diffusivity of different flow regimes on heat transfer reinforcement is discussed. The results indicate that,the fluid diffusion intensity in the flow channel of chaotic structure increases linearly with the Reynolds number (Re),and the fluid diffusivity of chaotic structure of the same kind increases linearly with flow rate. Compared with the general laminar flow,the diffusivity of chaotic convection increases the capacity of the fluid macroscopic motion to carry heat and reinforces the heat transfer between fluids.
出处
《石油机械》
北大核心
2009年第8期4-7,108,共4页
China Petroleum Machinery
基金
河南省杰出人才创新基金项目"高导热复合材料换热设备的研究"(0621001600)
关键词
混沌对流
扩散性
传热强化
李雅普诺夫指数
chaotic convection,diffusivity,heat transfer reinforcement,Lyapunov exponent
