Gas Diffusion in Fractal Porous Media

被引：40

作者：

Cao, Liyong ^{[1
]}

He, Rong ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Thermal Engn, Beijing 10084, Peoples R China

来源：

COMBUSTION SCIENCE AND TECHNOLOGY | 2010年 / 182卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Char pores; Diffusion; Fractal; TEMPERATURE COMBUSTION-RATE; COAL CHAR; COMPUTER-SIMULATION; ANOMALOUS DIFFUSION; OXIDATION BEHAVIOR; PORES; DIMENSIONS; EVOLUTION; CLUSTERS;

D O I：

10.1080/00102200903341553

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Gas diffusion in char pores or other fractal pores is anomalous diffusion that does not follow Fick's diffusion law. The authors studied gas diffusion in fractal porous media by simulating molecular movements in porous models. Through analyzing numerical results, gas diffusion equations in fractal pores have been presented. The effects of geometrical structures on pore diffusion can be described by three parameters: porosity, specific surface area, and fractal dimension. With these three parameters, the diffusion coefficient can be calculated. The steady-state diffusion equation is quantitatively determined so that it can be potentially used in modeling char combustion or other practical applications.

引用

页码：822 / 841

页数：20

共 33 条

[1] DIFFUSION IN A RANDOM MEDIUM - A MONTE-CARLO STUDY [J].

AVRAMOV, I ;

MILCHEV, A ;

ARGYRAKIS, P .

PHYSICAL REVIEW E, 1993, 47 (04) :2303-2307

[2]

Bird G., 1994, MOL GAS DYNAMICS DIR

[3] Modelling diffusion-limited gasification of carbons by branching pore models [J].

Borrelli, S ;

Giordano, M ;

Salatino, P .

CHEMICAL ENGINEERING JOURNAL, 1996, 64 (01) :77-84

[4]

Brewster B.S., 1993, FUNDAMENTALS COAL CO

[5] Numerical Simulations of gas diffusion and reaction in fractal pores during char combustion [J].

Chen, Qun ;

He, Rong ;

Liang, Zhanggang ;

Xu, Xuchang ;

Sato, Jun'ichi .

COMBUSTION SCIENCE AND TECHNOLOGY, 2007, 179 (04) :695-722

[6] Scaling behavior of diffusion and reaction processes in percolating porous media -: art. no. 061406 [J].

Costa, MHAS ;

Araújo, AD ;

da Silva, HF ;

Andrade, JS .

PHYSICAL REVIEW E, 2003, 67 (06) :5-061406

[7] FRACTAL ANALYSIS OF GAS-ADSORPTION ON SYNCRUDE COKE [J].

FAIRBRIDGE, C ;

NG, SH ;

PALMER, AD .

FUEL, 1986, 65 (12) :1759-1762

[8] On the application of the Thiele/Zeldovich analysis to porous carbon combustion [J].

Förtsch, D ;

Essenhigh, RH ;

Schnell, U ;

Hein, KRG .

ENERGY & FUELS, 2003, 17 (04) :901-906

[9] MERCURY POROSIMETRY OF UPGRADED WESTERN CANADIAN COALS [J].

FRIESEN, WI ;

OGUNSOLA, OI .

FUEL, 1995, 74 (04) :604-609

[10] ANOMALOUS DIFFUSION ON PERCOLATING CLUSTERS [J].

GEFEN, Y ;

AHARONY, A ;

ALEXANDER, S .

PHYSICAL REVIEW LETTERS, 1983, 50 (01) :77-80

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