A Coupled Model for Natural Convection and Condensation in HeatedSubsurface Enclosures Embedded in Fractured Rock

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In heated tunnels such as those designated for emplacementof radioactive waste at Yucca Mountain, axial temperature gradients maycause natural convection processes that can significantly influence themoisture conditions in the tunnels and in the surrounding fractured rock.Large-scale convection cells would provide an effective mechanism foraxial vapor transport, driving moisture out of the formation away fromthe heated tunnel section into cool end sections (where no waste isemplaced). To study such processes, we have developed and applied anenhanced version of TOUGH2 (Pruess et al., 1999) adding a new module thatsolves for natural convection in open cavities. The new TOUGH2 simulatorsimultaneously handles (1) the ... continued below

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Halecky, N.; Birkholzer, J.T.; Webb, S.W.; Peterson, P.F. & Bodvarsson, G.S. April 14, 2006.

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In heated tunnels such as those designated for emplacementof radioactive waste at Yucca Mountain, axial temperature gradients maycause natural convection processes that can significantly influence themoisture conditions in the tunnels and in the surrounding fractured rock.Large-scale convection cells would provide an effective mechanism foraxial vapor transport, driving moisture out of the formation away fromthe heated tunnel section into cool end sections (where no waste isemplaced). To study such processes, we have developed and applied anenhanced version of TOUGH2 (Pruess et al., 1999) adding a new module thatsolves for natural convection in open cavities. The new TOUGH2 simulatorsimultaneously handles (1) the flow and energy transport processes in thefractured rock; (2) the flow and energy transport processes in thecavity; and (3) the heat and mass exchange at the rock-cavity interface.The new module is applied to simulate the future thermal-hydrological(TH) conditions within and near a representative waste emplacement tunnelat Yucca Mountain. Particular focus is on the potential for condensationalong the emplacement section, a possible result of heat outputdifferences between individual waste packages.

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  • TOUGH Symposium 2006, Berkeley, CA, 15-17 May2006

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  • Report No.: LBNL--61235
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 920168
  • Archival Resource Key: ark:/67531/metadc900026

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  • April 14, 2006

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 29, 2016, 2:13 p.m.

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Halecky, N.; Birkholzer, J.T.; Webb, S.W.; Peterson, P.F. & Bodvarsson, G.S. A Coupled Model for Natural Convection and Condensation in HeatedSubsurface Enclosures Embedded in Fractured Rock, article, April 14, 2006; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc900026/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.