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Beyond the Salt Crust: On Combined Evaporation and Subflorescent Salt Precipitation in Porous Media
Year:
2015
Source of publication :
Transport in Porous Media
Authors :
Nachshon, Uri
;
.
Volume :
110
Co-Authors:
Nachshon, U., Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion, Israel, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Research Center, Bet-Dagan, Israel
Weisbrod, N., Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion, Israel
Facilitators :
From page:
295
To page:
310
(
Total pages:
16
)
Abstract:
The impact of salt precipitation, within or on top of porous media, on water evaporation from the media is an important issue with practical implications for agricultural practices, civil engineering and construction materials, the food industry and more. Even though the evaporation of saline solutions from porous media has been widely studied in recent years, there are still many uncertainties about the associated physical and chemical mechanisms. Moreover, most studies have focused on the impact of efflorescent salt precipitation on evaporation. This work focuses on subflorescent salt precipitation and its connection to evaporation from porous media. The different impacts of subflorescent and efflorescent salt precipitation on porous media evaporation are discussed, and the results of experiments that measured and quantified the impact of crystallization patterns on evaporation and porous media hydraulic conductivity are presented. A simple model was used to better understand the limiting factors that control liquid transport within porous media, with and without crystallized salts. The experimental results showed a major impact of efflorescent salt crust on evaporation, while for the subflorescent salt precipitation, the measured evaporation rates were similar to those measured for salt-free conditions. The model indicated that even though subflorescent-precipitated salt reduced the hydraulic conductivity of the medium by several orders of magnitude, it was not the limiting factor for evaporation as the diffusive vapor transport between the matrix surface and atmosphere was the slowest transport mechanism in the system, thus controlling evaporation rates. © 2015, Springer Science+Business Media Dordrecht.
Note:
Related Files :
limiting factor
Orders of magnitude
Saline solutions
Salt precipitation
Soil clogging
Thermal processing (foods)
Show More
Related Content
More details
DOI :
10.1007/s11242-015-0514-9
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
24545
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:08
Scientific Publication
Beyond the Salt Crust: On Combined Evaporation and Subflorescent Salt Precipitation in Porous Media
110
Nachshon, U., Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion, Israel, Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Research Center, Bet-Dagan, Israel
Weisbrod, N., Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion, Israel
Beyond the Salt Crust: On Combined Evaporation and Subflorescent Salt Precipitation in Porous Media
The impact of salt precipitation, within or on top of porous media, on water evaporation from the media is an important issue with practical implications for agricultural practices, civil engineering and construction materials, the food industry and more. Even though the evaporation of saline solutions from porous media has been widely studied in recent years, there are still many uncertainties about the associated physical and chemical mechanisms. Moreover, most studies have focused on the impact of efflorescent salt precipitation on evaporation. This work focuses on subflorescent salt precipitation and its connection to evaporation from porous media. The different impacts of subflorescent and efflorescent salt precipitation on porous media evaporation are discussed, and the results of experiments that measured and quantified the impact of crystallization patterns on evaporation and porous media hydraulic conductivity are presented. A simple model was used to better understand the limiting factors that control liquid transport within porous media, with and without crystallized salts. The experimental results showed a major impact of efflorescent salt crust on evaporation, while for the subflorescent salt precipitation, the measured evaporation rates were similar to those measured for salt-free conditions. The model indicated that even though subflorescent-precipitated salt reduced the hydraulic conductivity of the medium by several orders of magnitude, it was not the limiting factor for evaporation as the diffusive vapor transport between the matrix surface and atmosphere was the slowest transport mechanism in the system, thus controlling evaporation rates. © 2015, Springer Science+Business Media Dordrecht.
Scientific Publication
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