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Title: Pore-scale water dynamics during drying and the impacts of structure and surface wettability

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [2];  [2];  [4];  [3]; ORCiD logo [5]
  1. Department of Civil and Environmental Engineering, University of Connecticut, Storrs Connecticut USA
  2. Department of Physics and Engineering, Benedict College, Columbia South Carolina USA
  3. Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs Connecticut USA
  4. Department of Molecular and Cell Biology, University of Connecticut, Storrs Connecticut USA
  5. Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs Connecticut USA, Center for Environmental Sciences and Engineering, University of Connecticut, Storrs Connecticut USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1375527
Grant/Contract Number:
SC0014522; 2012-67020-19380
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Water Resources Research
Additional Journal Information:
Journal Volume: 53; Journal Issue: 7; Related Information: CHORUS Timestamp: 2018-02-09 10:30:51; Journal ID: ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English

Citation Formats

Cruz, Brian C., Furrer, Jessica M., Guo, Yi-Syuan, Dougherty, Daniel, Hinestroza, Hector F., Hernandez, Jhoan S., Gage, Daniel J., Cho, Yong Ku, and Shor, Leslie M. Pore-scale water dynamics during drying and the impacts of structure and surface wettability. United States: N. p., 2017. Web. doi:10.1002/2016WR019862.
Cruz, Brian C., Furrer, Jessica M., Guo, Yi-Syuan, Dougherty, Daniel, Hinestroza, Hector F., Hernandez, Jhoan S., Gage, Daniel J., Cho, Yong Ku, & Shor, Leslie M. Pore-scale water dynamics during drying and the impacts of structure and surface wettability. United States. doi:10.1002/2016WR019862.
Cruz, Brian C., Furrer, Jessica M., Guo, Yi-Syuan, Dougherty, Daniel, Hinestroza, Hector F., Hernandez, Jhoan S., Gage, Daniel J., Cho, Yong Ku, and Shor, Leslie M. 2017. "Pore-scale water dynamics during drying and the impacts of structure and surface wettability". United States. doi:10.1002/2016WR019862.
@article{osti_1375527,
title = {Pore-scale water dynamics during drying and the impacts of structure and surface wettability},
author = {Cruz, Brian C. and Furrer, Jessica M. and Guo, Yi-Syuan and Dougherty, Daniel and Hinestroza, Hector F. and Hernandez, Jhoan S. and Gage, Daniel J. and Cho, Yong Ku and Shor, Leslie M.},
abstractNote = {},
doi = {10.1002/2016WR019862},
journal = {Water Resources Research},
number = 7,
volume = 53,
place = {United States},
year = 2017,
month = 6
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 10, 2018
Publisher's Accepted Manuscript

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  • Understanding the physics of water evaporation from saline porous media is important in many natural and engineering applications such as durability of building materials and preservation of monuments, water quality, and mineral-fluid interactions. We applied synchrotron x-ray micro-tomography to investigate the pore-scale dynamics of dissolved salt distribution in a three dimensional drying saline porous media using a cylindrical plastic column (15 mm in height and 8 mm in diameter) packed with sand particles saturated with CaI{sub 2} solution (5% concentration by mass) with a spatial and temporal resolution of 12 μm and 30 min, respectively. Every time the drying sandmore » column was set to be imaged, two different images were recorded using distinct synchrotron x-rays energies immediately above and below the K-edge value of Iodine. Taking the difference between pixel gray values enabled us to delineate the spatial and temporal distribution of CaI{sub 2} concentration at pore scale. Results indicate that during early stages of evaporation, air preferentially invades large pores at the surface while finer pores remain saturated and connected to the wet zone at bottom via capillary-induced liquid flow acting as evaporating spots. Consequently, the salt concentration increases preferentially in finer pores where evaporation occurs. Higher salt concentration was observed close to the evaporating surface indicating a convection-driven process. The obtained salt profiles were used to evaluate the numerical solution of the convection-diffusion equation (CDE). Results show that the macro-scale CDE could capture the overall trend of the measured salt profiles but fail to produce the exact slope of the profiles. Our results shed new insight on the physics of salt transport and its complex dynamics in drying porous media and establish synchrotron x-ray tomography as an effective tool to investigate the dynamics of salt transport in porous media at high spatial and temporal resolution.« less
  • This paper describes the development and implementation of a pore-scale simulator into which pore-wettability effects have been incorporated. Relative permeability and capillary pressure curves from this steady-state model have been analyzed to allow better interpretation of experimental observations from a microscopic standpoint. The simulated capillary pressure data demonstrate that some standard wettability tests (such as Amott-Harvey and free imbibition) may give misleading results when the sample is fractionally wet in nature. Waterflood displacement efficiencies for a range of wettability conditions have been calculated, and recovery is shown to be maximum when the oil-wet pore fraction approaches 0.5. Furthermore, a novelmore » experimental test is proposed that can be used to distinguish between fractionally wet and mixed-wet porous media. To date, no such satisfactory test exists.« less