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Diffusion of Carbon Dioxide Through Upper Layers of Yucca Mountain

Published online by Cambridge University Press:  25 February 2011

Ajeet Singh ,
Gary Tatterson ,
Franklin G. King  and
Tevfik Bardakci
Ajeet Singh
Affiliation:
North Carolina A&T State University, Department of Chemical Engineering Greensboro, N.C. 27411
Gary Tatterson
Affiliation:
North Carolina A&T State University, Department of Chemical Engineering Greensboro, N.C. 27411
Franklin G. King
Affiliation:
North Carolina A&T State University, Department of Chemical Engineering Greensboro, N.C. 27411
Tevfik Bardakci*
Affiliation:
Akdeniz University, Faculty of Arts and Sciences 07070 Antalya - TURKEY
*
1To whom correspondence should be addressed
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Abstract

The effective diffusivities of carbon dioxide through Tiva Canyon tuff and the lower lithophysal zone of the Topopah Spring tuff (outcrop sample of the layer above the proposed nuclear repository site layer) were determined using a steady-state method (counter diffusion). The diffusivity of carbon dioxide through the Tiva Canyon and lithophysal zone tuffs increased with temperature and decreased with percent saturation. The following correlation was obtained to estimate the effective diffusivity of carbon dioxide through the Tiva Canyon tuff as a function temperature and percent saturation.

De = 1.2168×10−2 − 3.7713×10−5 T + 9.9510×10−8 T2 − 4.2220×10−5 × (Percent Saturation)

where De is in cm2/sec and T in K. These units hold for all other correlations in this paper.

The effective diffusivity of carbon dioxide through the lower lithophysal zone of the Topopah Spring tuff (layer right above the proposed repository site) also increased with temperature and decreased with percent saturation. For this layer, the following correlation was obtained to estimate the effective diffusivity of carbon dioxide as a function temperature and percent saturation.

De = − 1.119×10−3 + 1.2512×10−5 T + 1.8288×10−9 T2 × 2.0725×10−5 × (Percent Saturation)

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 617
Copyright
Copyright © Materials Research Society 1992

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References

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