INTERDIFFUSION OF GASES IN A LOW-PERMEABILITY GRAPHITE. II. INFLUENCE OF PRESSURE GRADIENTS
A previous experimental investigation of the interdiffusion behavior of two unlike gases within a porous medium at uniform pressure was extended. The extended studies were focused on interdiffusion under the influence of pressure gradients that in turn, give rise to both viscous and diffusive components of the experimentally determined fluxes. The fact that the diffusion processes investigated occurred within the region bounded by the normal and Knudsen regimes, constituted one of the most important features of these studies. The experimentally observed flux phenomena could be readily explained within the framework of a dust-gas model. The flux equations exhibited only one major weakness and this involved the absence of viscous flow contributions resulting from the pressure gradients. However, it was possible to use these and related equations and, with associated parameters, to reconstruct the experimental curves via computations. It was found that the range of applicability of the equations was limited and that none of the parameters could be predicted beforehand. This was partially the result of the internalpore geometry of the graphite. Nevertheless, the applicability of the existing dust-gas equations to nonuniform pressure conditions was established for the transition region insofar as is possible with a medium such as graphite. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-037531
- OSTI ID:
- 4630560
- Journal Information:
- Journal of Applied Physics (U.S.), Journal Name: Journal of Applied Physics (U.S.) Vol. Vol: 34; ISSN JAPIA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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