Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions
The mixing of a single-component or multi-component hydrocarbon (HC) droplet in supercritical or near-critical water (SCW/NCW) is modeled. Transport, thermodynamics, and phase equilibrium sub-models are used to estimate the relevant physical properties. We use a generalized Maxwell–Stefan (MS) expre...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2017
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| Online Access: | http://hdl.handle.net/1721.1/109935 https://orcid.org/0000-0001-8730-272X https://orcid.org/0000-0002-2671-8657 |
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| author | Ghoniem, Ahmed F He, Ping Raghavan, Ashwin |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Ghoniem, Ahmed F He, Ping Raghavan, Ashwin |
| author_sort | Ghoniem, Ahmed F |
| collection | MIT |
| description | The mixing of a single-component or multi-component hydrocarbon (HC) droplet in supercritical or near-critical water (SCW/NCW) is modeled. Transport, thermodynamics, and phase equilibrium sub-models are used to estimate the relevant physical properties. We use a generalized Maxwell–Stefan (MS) expression to model the multi-component mass transfer and a diffusion driving force expressed in terms of fugacity gradients to account for effects of non-ideality on mass fluxes. We compare the ideal and non-ideal diffusive driving forces for different mixing conditions and different HCs, and show that when the mixing temperature is close to or greater than the upper critical solution temperature (UCST), the non-ideal driving force model predicts a much slower mixing process and higher concentrations of the heavier HC than the ideal driving force, due to the presence of a diffusion barrier captured by the non-ideal driving force model. |
| first_indexed | 2024-09-23T12:06:04Z |
| format | Article |
| id | mit-1721.1/109935 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:06:04Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1099352022-10-01T08:11:39Z Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions Ghoniem, Ahmed F He, Ping Raghavan, Ashwin Massachusetts Institute of Technology. Department of Mechanical Engineering Ghoniem, Ahmed F He, Ping Raghavan, Ashwin The mixing of a single-component or multi-component hydrocarbon (HC) droplet in supercritical or near-critical water (SCW/NCW) is modeled. Transport, thermodynamics, and phase equilibrium sub-models are used to estimate the relevant physical properties. We use a generalized Maxwell–Stefan (MS) expression to model the multi-component mass transfer and a diffusion driving force expressed in terms of fugacity gradients to account for effects of non-ideality on mass fluxes. We compare the ideal and non-ideal diffusive driving forces for different mixing conditions and different HCs, and show that when the mixing temperature is close to or greater than the upper critical solution temperature (UCST), the non-ideal driving force model predicts a much slower mixing process and higher concentrations of the heavier HC than the ideal driving force, due to the presence of a diffusion barrier captured by the non-ideal driving force model. 2017-06-16T13:48:21Z 2017-06-16T13:48:21Z 2015-04 2015-03 Article http://purl.org/eprint/type/JournalArticle 0896-8446 http://hdl.handle.net/1721.1/109935 He, Ping; Raghavan, Ashwin and Ghoniem, Ahmed F. “Impact of Non-Ideality on Mixing of Hydrocarbons and Water at Supercritical or Near-Critical Conditions.” The Journal of Supercritical Fluids 102 (July 2015): 50–65 © 2015 Elsevier B.V. https://orcid.org/0000-0001-8730-272X https://orcid.org/0000-0002-2671-8657 en_US http://dx.doi.org/10.1016/j.supflu.2015.03.017 Journal of Supercritical Fluids The Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier Prof. Ghoniem via Angie Locknar |
| spellingShingle | Ghoniem, Ahmed F He, Ping Raghavan, Ashwin Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions |
| title | Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions |
| title_full | Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions |
| title_fullStr | Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions |
| title_full_unstemmed | Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions |
| title_short | Impact of non-ideality on mixing of hydrocarbons and water at supercritical or near-critical conditions |
| title_sort | impact of non ideality on mixing of hydrocarbons and water at supercritical or near critical conditions |
| url | http://hdl.handle.net/1721.1/109935 https://orcid.org/0000-0001-8730-272X https://orcid.org/0000-0002-2671-8657 |
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