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Study of short-term evaporation in sand specimens via micro-focus Xray computed tomography

Study of short-term evaporation in sand specimens via micro-focus Xray computed tomography
Study of short-term evaporation in sand specimens via micro-focus Xray computed tomography
Water flow and heat transfer often occur simultaneously in soils, in coupled flow, for example in applications such as ground heat thermal storage and disposal of nuclear waste. It is proposed that micro-focus X-ray computed tomography (micro-XCT) can be used to investigate this phenomenon. A natural thermally-driven water flow, evaporation from an exposed soil specimen, is studied to assess the applicability of micro-XCT techniques to other problems in soil heat / moisture transfer. This paper presents studies of short-term evaporation from a sand. A series of scans were conducted on a specimen of sand during evaporation, to provide data for comparison with simultaneous gravimetric measurements made using a sensitive balance in the scanner. Both qualitative and quantitative data from the micro-XCT are presented. Drying of the specimen during each stage can be clearly seen in the image data. However, quantification of the change in water content by image analysis is more challenging, owing to the compromise between the image quality and the scanning time. To overcome this, an alternative approach to segmentation of the image data using Gaussian curve fitting is proposed and validated against global gravimetric measurements. It is concluded that this approach to the analysis of the rapid movement of moisture within the soil is promising, and it will be applied in future experiments.
Liu, Kui
eeadfb38-005d-45a0-bb01-8b8eb734918b
Loveridge, Fleur
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Boardman, Richard
5818d677-5732-4e8a-a342-7164dbb10df1
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Liu, Kui
eeadfb38-005d-45a0-bb01-8b8eb734918b
Loveridge, Fleur
fb5b7ad9-d1b8-40d3-894b-bccedf0e8a77
Boardman, Richard
5818d677-5732-4e8a-a342-7164dbb10df1
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c

Liu, Kui, Loveridge, Fleur, Boardman, Richard and Powrie, William (2017) Study of short-term evaporation in sand specimens via micro-focus Xray computed tomography. In Proceedings of the 2nd Symposium on Coupled Phenomena in Environmental Geotechnics (CPEG2). 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Water flow and heat transfer often occur simultaneously in soils, in coupled flow, for example in applications such as ground heat thermal storage and disposal of nuclear waste. It is proposed that micro-focus X-ray computed tomography (micro-XCT) can be used to investigate this phenomenon. A natural thermally-driven water flow, evaporation from an exposed soil specimen, is studied to assess the applicability of micro-XCT techniques to other problems in soil heat / moisture transfer. This paper presents studies of short-term evaporation from a sand. A series of scans were conducted on a specimen of sand during evaporation, to provide data for comparison with simultaneous gravimetric measurements made using a sensitive balance in the scanner. Both qualitative and quantitative data from the micro-XCT are presented. Drying of the specimen during each stage can be clearly seen in the image data. However, quantification of the change in water content by image analysis is more challenging, owing to the compromise between the image quality and the scanning time. To overcome this, an alternative approach to segmentation of the image data using Gaussian curve fitting is proposed and validated against global gravimetric measurements. It is concluded that this approach to the analysis of the rapid movement of moisture within the soil is promising, and it will be applied in future experiments.

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CPEG2_2017_paper_42
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CPEG2 2017 paper 42
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More information

Published date: 27 March 2017
Venue - Dates: The 2nd Symposium on Coupled Phenomena in Environmental Geotechnics (CPEG2), 2017-09-06 - 2017-09-07

Identifiers

Local EPrints ID: 425272
URI: http://eprints.soton.ac.uk/id/eprint/425272
PURE UUID: c363b894-798d-400e-93ae-39a19ff828ea
ORCID for Kui Liu: ORCID iD orcid.org/0000-0002-7533-1272
ORCID for Fleur Loveridge: ORCID iD orcid.org/0000-0002-6688-6305
ORCID for William Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 12 Oct 2018 16:30
Last modified: 07 Aug 2020 01:43

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