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dc.contributor.authorGarcia, A.V.
dc.contributor.authorSantamarina, Carlos
dc.date.accessioned2021-04-26T08:52:52Z
dc.date.available2021-04-26T08:52:52Z
dc.date.issued2021-04-21
dc.date.submitted2020-09-25
dc.identifier.citationGarcia, A. V., & Santamarina, J. C. (2021). Heat Flow in Fractured Rocks: Stress and Moisture-Dependent Thermal Contact Resistance. Geothermics, 95, 102113. doi:10.1016/j.geothermics.2021.102113
dc.identifier.issn0375-6505
dc.identifier.doi10.1016/j.geothermics.2021.102113
dc.identifier.urihttp://hdl.handle.net/10754/668949
dc.description.abstractThe thermal conductivity of fractured rock masses is an important parameter for the analysis of energy geosystems, yet, its measurement is challenged by specimen size requirements. Fluids within fractures have lower thermal conductivities than rock minerals and heat flow lines constrict through contacting asperities. Together, heat flow constriction and phonon boundary scattering cause an apparent temperature discontinuity across the fracture, typically represented as a thermal contact resistance. We investigate the thermal contact resistance in fractured limestone and its evolution during loading and unloading (σ’=10 kPa to σ’=3000 kPa) for clean and gouge-filled fractures, under both air-dry and water-saturated conditions. The fracture thermal contact resistance decreases during loading because of the increase in the true contact area, gouge and asperity crushing, and fracture filling by produced fines that contribute new conduction pathways. These processes convey high stress sensitivity and loading hysteresis to the fracture thermal contact resistance. Water fills the fracture interstices and forms menisci at mineral contacts that significantly improve heat conduction even in partially saturated rock masses. The rock mass effective thermal conductivity can be estimated by combining the intact rock thermal conductivity with measurements of the thermal contact resistance of a single fracture under field boundary conditions.
dc.description.sponsorshipSupport for this research was provided by the KAUST endowment at King Abdullah University of Science and Technology. Our gratitude extends to Gabrielle E. Abelskamp who edited the manuscript.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0375650521000730
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Geothermics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Geothermics, [95, , (2021-04-21)] DOI: 10.1016/j.geothermics.2021.102113 . © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleHeat Flow in Fractured Rocks: Stress and Moisture-Dependent Thermal Contact Resistance
dc.typeArticle
dc.contributor.departmentKAUST, Physical Sciences and Engineering, Thuwal, 23955-6900, Saudi Arabia.
dc.contributor.departmentEnergy Resources and Petroleum Engineering Program
dc.contributor.departmentAli I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalGeothermics
dc.rights.embargodate2023-04-21
dc.eprint.versionPost-print
dc.identifier.volume95
dc.identifier.pages102113
kaust.personGarcia, A.V.
kaust.personSantamarina, Carlos
dc.date.accepted2021-04-03
dc.date.published-online2021-04-21
dc.date.published-print2021-09


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