CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube
<div><p>Falling film evaporators are used in applications where high heat transfer coefficients are required for low liquid load and temperature difference. One such application is the lithium bromide (LiBr)-based absorber and generator. The concentration of the aqueous LiBr solution cha...
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| منشور في: |
2020
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| _version_ | 1864513524035747840 |
|---|---|
| author | Furqan Tahir (14429547) |
| author2 | Abdelnasser Mabrouk (14778283) Muammer Koç (8350053) |
| author2_role | author author |
| author_facet | Furqan Tahir (14429547) Abdelnasser Mabrouk (14778283) Muammer Koç (8350053) |
| author_role | author |
| dc.creator.none.fl_str_mv | Furqan Tahir (14429547) Abdelnasser Mabrouk (14778283) Muammer Koç (8350053) |
| dc.date.none.fl_str_mv | 2020-01-08T03:00:00Z |
| dc.identifier.none.fl_str_mv | 10.3390/en13020307 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/CFD_Analysis_of_Falling_Film_Hydrodynamics_for_a_Lithium_Bromide_LiBr_Solution_over_a_Horizontal_Tube/25347589 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Engineering Control engineering, mechatronics and robotics Electrical engineering Electronics, sensors and digital hardware falling film film thickness CFD horizontal tube lithium bromide LiBr transient analysis VOF |
| dc.title.none.fl_str_mv | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <div><p>Falling film evaporators are used in applications where high heat transfer coefficients are required for low liquid load and temperature difference. One such application is the lithium bromide (LiBr)-based absorber and generator. The concentration of the aqueous LiBr solution changes within the absorber and generator because of evaporation and vapor absorption. This causes the thermophysical properties to differ and affects the film distribution, heat, and mass transfer mechanisms. For thermal performance improvement of LiBr-based falling film evaporators, in-depth analysis at the micro level is required for film distribution and hydrodynamics. In this work, a 2D numerical model was constructed using the commercial CFD software Ansys Fluent v18.0. The influence of the liquid load corresponding to droplet and jet mode, and the concentration, on film hydrodynamics was examined. It was found that the jet mode was more stable at a higher concentration of 0.65 with ±0.5% variation compared to lower concentrations. The recirculation was stronger at a low concentration of 0.45 and existed until the angular position (θ) = 10°, whereas at 0.65 concentration it diminished after θ = 5°. The improved heat transfer is expected at lower concentrations due to lower film thickness and thermal resistance, more recirculation, and a higher velocity field.</p><p> </p></div><h2>Other Information</h2> <p> Published in: Energies<br> License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/en13020307" target="_blank">https://dx.doi.org/10.3390/en13020307</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_8d6cdc5e0cb674e35f41c57da82bec54 |
| identifier_str_mv | 10.3390/en13020307 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/25347589 |
| publishDate | 2020 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal TubeFurqan Tahir (14429547)Abdelnasser Mabrouk (14778283)Muammer Koç (8350053)EngineeringControl engineering, mechatronics and roboticsElectrical engineeringElectronics, sensors and digital hardwarefalling filmfilm thicknessCFDhorizontal tubelithium bromideLiBrtransient analysisVOF<div><p>Falling film evaporators are used in applications where high heat transfer coefficients are required for low liquid load and temperature difference. One such application is the lithium bromide (LiBr)-based absorber and generator. The concentration of the aqueous LiBr solution changes within the absorber and generator because of evaporation and vapor absorption. This causes the thermophysical properties to differ and affects the film distribution, heat, and mass transfer mechanisms. For thermal performance improvement of LiBr-based falling film evaporators, in-depth analysis at the micro level is required for film distribution and hydrodynamics. In this work, a 2D numerical model was constructed using the commercial CFD software Ansys Fluent v18.0. The influence of the liquid load corresponding to droplet and jet mode, and the concentration, on film hydrodynamics was examined. It was found that the jet mode was more stable at a higher concentration of 0.65 with ±0.5% variation compared to lower concentrations. The recirculation was stronger at a low concentration of 0.45 and existed until the angular position (θ) = 10°, whereas at 0.65 concentration it diminished after θ = 5°. The improved heat transfer is expected at lower concentrations due to lower film thickness and thermal resistance, more recirculation, and a higher velocity field.</p><p> </p></div><h2>Other Information</h2> <p> Published in: Energies<br> License: <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.3390/en13020307" target="_blank">https://dx.doi.org/10.3390/en13020307</a></p>2020-01-08T03:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.3390/en13020307https://figshare.com/articles/journal_contribution/CFD_Analysis_of_Falling_Film_Hydrodynamics_for_a_Lithium_Bromide_LiBr_Solution_over_a_Horizontal_Tube/25347589CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/253475892020-01-08T03:00:00Z |
| spellingShingle | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube Furqan Tahir (14429547) Engineering Control engineering, mechatronics and robotics Electrical engineering Electronics, sensors and digital hardware falling film film thickness CFD horizontal tube lithium bromide LiBr transient analysis VOF |
| status_str | publishedVersion |
| title | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube |
| title_full | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube |
| title_fullStr | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube |
| title_full_unstemmed | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube |
| title_short | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube |
| title_sort | CFD Analysis of Falling Film Hydrodynamics for a Lithium Bromide (LiBr) Solution over a Horizontal Tube |
| topic | Engineering Control engineering, mechatronics and robotics Electrical engineering Electronics, sensors and digital hardware falling film film thickness CFD horizontal tube lithium bromide LiBr transient analysis VOF |