Mass transfer within the gas-phase of porous media

被引：228

作者：

Kast, W ^{[1
]}

Hohenthanner, CR ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Inst Therm Verfahrenstech, D-64287 Darmstadt, Germany

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2000年 / 43卷 / 05期

关键词：

D O I：

10.1016/S0017-9310(99)00158-1

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The laws of various transport modes-viscous flow, diffusion and Knudsen flow-can be caused by the gradients of concentration, total and partial pressure. Their combined transports are derived and proved by selected experiments in the continuum as well as in the Knudsen region. The combination of these transport modes leads to phenomena like pressure diffusion, slip flow and diffusive slip. The three transport coefficients-the permeability, the binary diffusion coefficient and the Knudsen coefficient-can be determined by steady-state permeability and diffusion measurements. Nonsteady-state measurements deliver additional information about the pore structure of the porous medium. The presented measurements were carried out at cylindrical samples of rock salt with low porosity. Hydrogen and nitrogen were used as nonadsorbing gases. The binary diffusion experiments confirm Graham's law with good accuracy. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：807 / 823

页数：17

共 25 条

[1]

Bird R. B., 1976, TRANSPORT PHENOMENA

[2] THE FLUX-RATIO FOR BINARY COUNTERDIFFUSION OF IDEAL GASES [J].

DULLIEN, FAL ;

SCOTT, DS .

CHEMICAL ENGINEERING SCIENCE, 1962, 17 (10) :771-775

[3] GASEOUS DIFFUSION IN POROUS MEDIA AT UNIFORM PRESSURE [J].

EVANS, RB ;

WATSON, GM .

JOURNAL OF CHEMICAL PHYSICS, 1961, 35 (06) :2076-&

[4]

Graham T., 1829, Quarterly Journal of Science, Literature and Art, V2, P74

[5] DIFFUSION OF GASES IN POROUS SOLIDS OVER A THOUSAND-FOLD PRESSURE RANGE [J].

HENRY, JP ;

CUNNINGHAM, RS ;

GEANKOPLIS, CJ .

CHEMICAL ENGINEERING SCIENCE, 1967, 22 (01) :11-+

[6] Steady state and transient permeation and diffusion measurements in porous media [J].

Hohenthanner, CR ;

Kast, W ;

Fröhlich, H .

CHEMIE INGENIEUR TECHNIK, 1998, 70 (12) :1549-1553

[7]

HOHENTHANNER CR, 1996, THESIS TH DARMSTADT

[8] DIFFUSION IN POROUS CATALYSTS AND ADSORBENTS [J].

HOOGSCHAGEN, J .

INDUSTRIAL AND ENGINEERING CHEMISTRY, 1955, 47 (05) :906-913

[9]

HUGO P, 1975, BER BUNSEN PHYS CHEM, V75, P748

[10]

KAST W, 1994, WARME STOFFUBERTRAG, V29, P447, DOI 10.1007/BF01584047

← 1 2 3 →