| DOI: | 10.1002/2013GL058075
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| 论文题名: | Critical capillary number: Desaturation studied with fast X-ray computed microtomography |
| 作者: | Armstrong R.T.; Georgiadis A.; Ott H.; Klemin D.; Berg S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10509
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| EISSN: | 1944-10240
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| 出版年: | 2014
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| 卷: | 41, 期:1 | | 起始页码: | 55
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| 结束页码: | 60
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| 语种: | 英语
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| 英文关键词: | capillary number
; desaturation
; microtomography
; multiphase flow
; pore scale
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| Scopus关键词: | Capillary force
; Capillary numbers
; Desaturation
; Micro-tomography
; Phase clusters
; Pore scale
; Subsurface Flow
; X-ray computed microtomography
; Capillarity
; Multiphase flow
; Tomography
; Calcium
; capillarity
; cluster analysis
; flow pattern
; interface
; microtopography
; parameterization
; pore space
; saturation
; subsurface flow
; tension
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| 英文摘要: | For subsurface flow, the correct definition for the balance of viscous and capillary forces, the so-called capillary number (Ca), which predicts the mobilization of nonwetting phase, has been a long-standing controversy. The most common microscopic definition results in nonwetting phase mobilization at Ca ~10-5, which is counterintuitive. Rather, mobilization should occur at Ca ≥ 1. As demonstrated herein, by using fast synchrotron-based X-ray computed microtomography and averaging of thereby accessible pore-scale parameters to macroscale values, a macroscale Ca definition is validated and shown to correctly describe mobilization at Ca ~1. The presented methodology provides a connection between desaturation and pore-scale fluid topology and gives insight into when and how Ca changes with system size. The broader implication implies that it makes a difference whether desaturation is driven by an increase in flow rate or viscosity or decrease in interfacial tension since Ca incorporates nonwetting phase cluster length, which is process-dependent. Key Points Capillary number is validated Ca is scale dependent Cluster length defines representative volume ©2013. The Authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896708164&doi=10.1002%2f2013GL058075&partnerID=40&md5=2a1c7784740775f0b41aa22284880d7c
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7773
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Shell Global Solutions International B.V., Kesslerpark 1, Rijswijk, 2288GS, Netherlands
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| Recommended Citation: | |
Armstrong R.T.,Georgiadis A.,Ott H.,et al. Critical capillary number: Desaturation studied with fast X-ray computed microtomography[J]. Geophysical Research Letters,2014-01-01,41(1).
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