| Pressure dependence of the contact angle in a CO2-H2O-coal system. | |
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MedLine Citation:
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PMID: 16376358 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Carbon dioxide injection into coal layers serves the dual purpose to enhance coal bed methane production (ECBM) and to store CO2. The efficiency of this process is expected to be much higher if water is the non-wetting phase in the coal-water-gas system. Therefore, contact angles in the coal-water-CO2 system have been measured using the captive bubble technique in the pressure range between atmospheric pressure and 141 bar at a temperature of 45 degrees C. At atmospheric pressure the contact angle of a shrinking CO2 droplet increases with time, but stays below 90 degrees . At higher pressures (>2.6 bar) the contact angle increases beyond 90 degrees . The pressure dependence of the contact can be represented by theta=(111 degrees +/-10.5 degrees )+(0.17+/-0.14)P [bar]. The exceptional behavior at atmospheric pressure is possibly related to the stability of water patches on the coal surface. It is concluded that water is the non-wetting phase in this coal-water-CO2 system. |
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Authors:
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Nikolai Siemons; Hans Bruining; Hein Castelijns; Karl-Heinz Wolf |
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Publication Detail:
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Type: Journal Article Date: 2006-01-09 |
Journal Detail:
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Title: Journal of colloid and interface science Volume: 297 ISSN: 0021-9797 ISO Abbreviation: J Colloid Interface Sci Publication Date: 2006 May |
Date Detail:
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Created Date: 2006-04-24 Completed Date: 2007-07-06 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: United States |
Other Details:
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Languages: eng Pagination: 755-61 Citation Subset: - |
Affiliation:
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Dietz Laboratory, Centre of Technical Geoscience, TU Delft, Mijnbouwstraat 120, 2628 RX Delft, The Netherlands. n.siemons@citg.tudelft.nl |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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