【摘 要】
：
Based on fractal theory, two types of random Sierpinski carpets (RSCs) and their periodic structures are generated to model the structures of natural porous med
【机 构】
：
Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080“,”Graduate Schoo
论文部分内容阅读
Based on fractal theory, two types of random Sierpinski carpets (RSCs) and their periodic structures are generated to model the structures of natural porous media, and the heat conduction in these structures is simulated by the finite volume method. The calculated results indicate that in a certain range of length scales, the size and spatial arrangement of pores have significant influence on the effective thermal conductivity, and the heat conduction presents the aeolotropic characteristic. Above the length scale, however, the influence of size and spatial arrangement of pores on the effective thermal conductivity reduces gradually with the increasing characteristic size of porous media, the aeolotropic characteristic is weakened gradually. It is concluded that the periodicity in structures of porous media is not equal to the periodicity in heat conduction.
其他文献
走进临淄区凤凰镇广尔种植专业合作社，500亩土地的畦面上栽种着大樱桃，树下的畦面上套种着时令土豆、无休眠韭菜、荷兰菠菜、潍坊青萝卜、长腿大葱等新品蔬菜，实现了真正意义上的“立体种植”，使土地的产出效益比过去翻番了几倍甚至十几倍。 “这都得益于合作社和农商行把我们组织起来。既解决了俺们一家一户生产规模小，缺乏资金、技术、经验和市场信息的难题，又为农产品的规模生产和销售开辟了门路。”大路东村农民路书
临沂市现有人口1042万,其中60岁以上的老年人145万,占总人口的近14％.按照60岁以上的老年人占总人口的比例达到7％就进入了老年社会的标准,临沂市已经进入了老年社会.如何做好老
Composition dependence of quateary CuIn1-x Gax Se2 films on Ga content has been systematically investigated by Raman scattering. The dominant A1 mode shifts fro
We study the stochastic resonance (SR) in Hodgkin-Huxley (HH) neural systems with small-world (SW) connections under the noise synaptic current and periodic sti
Photoinduced effects on the transmission and resistivity in wide-bandwidth manganite La0.7Sr0.3MnO3 films (TC = 350 K) have been investigated at various tempera
一、TCL LCOS机芯TCL LCOS机心LCT系列液晶彩电,总线系统主控电路微处理器采用MTV212M32,数字信号处理电路采用INFOCUS光机电路等。适用机型:TCL LCT4312、LCT5212等机型。1.
Imaging properties of a two-dimensional photonic crystal (PC) slab consisting of a triangular lattice of metallic cylinders immersed in a dielectric background
Epitaxial ZnO films are grown on Al2O3 (0001) by the MOCVD method. These films are high quality wurtzite crystals with (0001) orientation. Big hexagonal crystal
ZnS films are deposited by pulsed laser deposition on porous silicon (PS) substrates formed by electrochemical anodization of p-type (100) silicon wafer. Scanni
少数民族预科班是国家出于对民族地区培养优秀的少数民族人才而采取的特殊办学形式.加强高校少数民族预科班管理工作是不断完善高校少数民族学生培养机制的重要方面,是筑牢中