Heterogeneous nanofluids: natural convection heat transfer enhancement
<p>Abstract</p> <p>Convective heat transfer using different nanofluid types is investigated. The domain is differentially heated and nanofluids are treated as heterogeneous mixtures with weak solutal diffusivity and possible Soret separation. Owing to the pronounced Soret effect of...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2011-01-01
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| Series: | Nanoscale Research Letters |
| Online Access: | http://www.nanoscalereslett.com/content/6/1/222 |
| _version_ | 1797724583900479488 |
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| author | Bennacer Rachid Oueslati Fakhreddine |
| author_facet | Bennacer Rachid Oueslati Fakhreddine |
| author_sort | Bennacer Rachid |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Convective heat transfer using different nanofluid types is investigated. The domain is differentially heated and nanofluids are treated as heterogeneous mixtures with weak solutal diffusivity and possible Soret separation. Owing to the pronounced Soret effect of these materials in combination with a considerable solutal expansion, the resulting solutal buoyancy forces could be significant and interact with the initial thermal convection. A modified formulation taking into account the thermal conductivity, viscosity versus nanofluids type and concentration and the spatial heterogeneous concentration induced by the Soret effect is presented. The obtained results, by solving numerically the full governing equations, are found to be in good agreement with the developed solution based on the scale analysis approach. The resulting convective flows are found to be dependent on the local particle concentration <it>φ </it>and the corresponding solutal to thermal buoyancy ratio <it>N</it>. The induced nanofluid heterogeneity showed a significant heat transfer modification. The heat transfer in natural convection increases with nanoparticle concentration but remains less than the enhancement previously underlined in forced convection case.</p> |
| first_indexed | 2024-03-12T10:19:12Z |
| format | Article |
| id | doaj.art-f27f84441cdd46fdbe72ba22bd8eadec |
| institution | Directory Open Access Journal |
| issn | 1931-7573 1556-276X |
| language | English |
| last_indexed | 2024-03-12T10:19:12Z |
| publishDate | 2011-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nanoscale Research Letters |
| spelling | doaj.art-f27f84441cdd46fdbe72ba22bd8eadec2023-09-02T10:17:29ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2011-01-0161222Heterogeneous nanofluids: natural convection heat transfer enhancementBennacer RachidOueslati Fakhreddine<p>Abstract</p> <p>Convective heat transfer using different nanofluid types is investigated. The domain is differentially heated and nanofluids are treated as heterogeneous mixtures with weak solutal diffusivity and possible Soret separation. Owing to the pronounced Soret effect of these materials in combination with a considerable solutal expansion, the resulting solutal buoyancy forces could be significant and interact with the initial thermal convection. A modified formulation taking into account the thermal conductivity, viscosity versus nanofluids type and concentration and the spatial heterogeneous concentration induced by the Soret effect is presented. The obtained results, by solving numerically the full governing equations, are found to be in good agreement with the developed solution based on the scale analysis approach. The resulting convective flows are found to be dependent on the local particle concentration <it>φ </it>and the corresponding solutal to thermal buoyancy ratio <it>N</it>. The induced nanofluid heterogeneity showed a significant heat transfer modification. The heat transfer in natural convection increases with nanoparticle concentration but remains less than the enhancement previously underlined in forced convection case.</p>http://www.nanoscalereslett.com/content/6/1/222 |
| spellingShingle | Bennacer Rachid Oueslati Fakhreddine Heterogeneous nanofluids: natural convection heat transfer enhancement Nanoscale Research Letters |
| title | Heterogeneous nanofluids: natural convection heat transfer enhancement |
| title_full | Heterogeneous nanofluids: natural convection heat transfer enhancement |
| title_fullStr | Heterogeneous nanofluids: natural convection heat transfer enhancement |
| title_full_unstemmed | Heterogeneous nanofluids: natural convection heat transfer enhancement |
| title_short | Heterogeneous nanofluids: natural convection heat transfer enhancement |
| title_sort | heterogeneous nanofluids natural convection heat transfer enhancement |
| url | http://www.nanoscalereslett.com/content/6/1/222 |
| work_keys_str_mv | AT bennacerrachid heterogeneousnanofluidsnaturalconvectionheattransferenhancement AT oueslatifakhreddine heterogeneousnanofluidsnaturalconvectionheattransferenhancement |