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Hydraulic Properties of Porous Media Saturated with Nanoparticle-Stabilized Air-Water Foam

Title
Hydraulic Properties of Porous Media Saturated with Nanoparticle-Stabilized Air-Water Foam
Author
장재원
Keywords
nanoparticle; air-water foam; viscosity; breakthrough pressure; hydraulic conductivity
Issue Date
2016-12
Publisher
MDPI AG
Citation
SUSTAINABILITY, v. 8, Issue 12, No.1317
Abstract
The foam generated by the mixture of air and water has a much higher viscosity and lower mobility than those of pure water or gas that constitutes the air-water foam. The possibility of using the air-water foam as a flow barrier for the purpose of groundwater and soil remediation is explored in this paper. A nanoparticle-stabilized air-water foam was fabricated by vigorously stirring the nano-fluid in pressurized condition. The foam bubble size distribution was analyzed with a microscope. The viscosities of foams generated with the solutions with several nanoparticle concentrations were measured as a function of time. The breakthrough pressure of foam-saturated microfluidicchipsandsandcolumnswereobtained. Thehydraulicconductivityofafoam-filledsand column was measured after foam breakthrough. The results show that: (1) bubble coalescence and theOstwaldripeningarebelievedtobethereasonofbubblesizedistributionchange;(2)theviscosity of nanoparticle-stabilized foam and the breakthrough pressures decreased with time once the foam was generated; (3) the hydraulic conductivity of the foam-filled sand column was almost two orders of magnitude lower than that of a water-saturated sand column even after the foam-breakthrough. Based on the results in this study, the nanoparticle-stabilized air-water foam could be injected into contaminated soils to generate vertical barriers for temporary hydraulic conductivity reduction.
URI
https://www.mdpi.com/2071-1050/8/12/1317https://repository.hanyang.ac.kr/handle/20.500.11754/101759
ISSN
2071-1050
DOI
10.3390/su8121317
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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