Three-dimensional temporal imaging of X-ray CT imaging of dissolution-driven convection in glass beads

The images in this dataset show the mixing of two liquid solutions in a random bead pack as a function of time and in three-dimensions. The working fluids used in this study are solutions of methanol and ethylene-glycol (MEG, fluid 1) and brine (fluid 2). In particular, three mixtures of ethylene-glycol and methanol were prepared that differ in wt% ethylene-glycol, namely 55 wt% (MEG55), 57 wt% (MEG57) and 59 wt% (MEG59). Measurements are conducted using in the regime of Rayleigh numbers, Ra = 2000-5000. X-ray Computed Tomography is applied to image the spatial and temporal evolution of the solute plume non -invasively. The tomograms are used to compute macroscopic quantities including the rate of dissolution and horizontally averaged concentration profiles, and enable the visualisation of the ow patterns that arise upon mixing at a spatial resolution of about (2x2x2) mm3. We observe that the mixing process evolves systematically through three stages, starting from pure diffusion, followed by convection-dominated and shutdown. A modified diffusion equation is applied to model the convective process with an onset time of convection that compares favourably with literature data and an effective diffusion coefficient that is almost two orders of magnitude larger than the molecular diffusivity of the solute. The comparison of the experimental observations of convective mixing against their numerical counterparts of the purely diffusive scenario enables the estimation of a non-dimensional convective mass flux in terms of the Sherwood number, Sh = 0.025Ra. We observe that the latter scales linearly with Ra, in agreement with observations from both experimental and numerical studies on thermal convection over the same Ra regime.

Citation proposal
qccsrc@imperial.ac.uk (Qatar Carbonates and Carbon Storage Research Centre). Three-dimensional temporal imaging of X-ray CT imaging of dissolution-driven convection in glass beads. https://metadata.bgs.ac.uk/geonetwork/srv/api/records/762484f0-e6f0-5eed-e054-002128a47908

Simple

Date ( Creation ): 2016

Identifier: http://data.bgs.ac.uk/id/dataHolding/13607381

Author

Qatar Carbonates and Carbon Storage Research Centre - qccsrc@imperial.ac.uk

United Kingdom

Point of contact

Qatar Carbonates and Carbon Storage Research Centre - qccsrc@imperial.ac.uk

United Kingdom

Point of contact

Imperial College London - Rebecca E Liyanage

London United Kingdom

Principal investigator

Imperial College London - Ronny Pini

London United Kingdom

Maintenance and update frequency: notApplicable notApplicable

GEMET - INSPIRE themes

Geology

BGS Thesaurus of Geosciences

Porosity , Carbon capture and storage

Keywords

NERC_DDC

Access constraints: otherRestrictions Other restrictions

Use constraints: otherRestrictions Other restrictions

Other constraints: The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints: Either: (i) the dataset is made freely available, e.g. via the Internet, for a restricted category of use (e.g. educational use only); or (ii) the dataset has not been formally approved by BGS for access and use by external clients under licence, but its use may be permitted under alternative formal arrangements; or (iii) the dataset contains 3rd party data or information obtained by BGS under terms and conditions that must be consulted in order to determine the permitted usage of the dataset. Refer to the BGS staff member responsible for the creation of the dataset if further advice is required. He / she should be familiar with the composition of the dataset, particularly with regard to 3rd party IPR contained in it, and any resultant use restrictions. This staff member should revert to the IPR Section (ipr@bgs.ac.uk ) for advice, should the position not be clear.

Metadata language: English English

Topic category

Geoscientific information

Supplemental Information: Liyanage et al (in review) Multidimensonal observations of dissolution-driven convection in simple porous media using X-ray CT scanning to be submitted to Transport in Porous Media

Reference System Information

No information provided.

Distribution format

Dicom ()

OnLine resource: http://www.bgs.ac.uk/ukccs/accessions/index.html#item118273

OnLine resource: http://dx.doi.org/10.5285/f18a68bf-470f-48b7-91a1-9ea412fca419

Hierarchy level: nonGeographicDataset Non geographic dataset

Other: non geographic dataset

Conformance result

Date ( Publication ): 2011

Explanation: See the referenced specification

Pass: false

Conformance result

Date ( Publication ): 2010-12-08

Explanation: See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Pass: false

Statement: The experiments have been conducted in a 3L acrylic plastic bowl packed with soda glass ballotini (dp = 0.5 mm, SiLibeads, supplied by VWR, UK). The bowl was scanned using a Universal Systems HD-350 X-ray CT scanner at an actual voxel (pixel) size of 0.47mm x 0.47mm x 2.0mm. The output images are in a proprietary dicom dataset format and include the metadata relating to the image acquisition scanner settings e.g. voxel size. The details of the sample preparation and fluid injection strategy can be found in Liyanage et al. Transport in Porous Media (in review). For image acquisition the following set of parameters was applied: field-of-view (24 x 24) cm2; energy level of radiation 120 eV; tube current 150 mA. Voxel size in the (x-y) plane is (0.4688 x 0.4688) mm2. For subsequent analysis, the latter are averaged over a 5 x 5 rectangular grid to produce (2.3 x 2.3 x 2) mm3 cubic voxels.