Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parameters
Heat transfer around a conical antenna is quantified in this work. Cooling of this active electronic component is ensured by a medium of high porosity saturated by a H2O–Cu nanofluid with a volume fraction varying between 0% and 5%. The ratio between the thermal conductivity of the porous materials...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23003325 |
| _version_ | 1797808402545508352 |
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| author | N. Alilat F. Sastre A. Martín-Garín A. Velazquez A. Baïri |
| author_facet | N. Alilat F. Sastre A. Martín-Garín A. Velazquez A. Baïri |
| author_sort | N. Alilat |
| collection | DOAJ |
| description | Heat transfer around a conical antenna is quantified in this work. Cooling of this active electronic component is ensured by a medium of high porosity saturated by a H2O–Cu nanofluid with a volume fraction varying between 0% and 5%. The ratio between the thermal conductivity of the porous materials and that of the water (base fluid) ranges from 4 to 41.2, the null value corresponding to a heat transfer without porous media (only nanofluid). The conical enclosure's aspect ratio varies in the 0.2–0.6 range, being its base inclined between 0° (horizontal base with cone's top oriented upwards) and 180° range (horizontal base with cone's top oriented downwards). The associated Rayleigh number varies within the 3.32x105-6.74x107 range. Heat transfer by natural convection is quantified for any configuration combining these five parameters and presented via a correlation allowing determination of the average Nusselt number. This study shows that heat transfer increases when the cone is tilted. For a given aspect ratio, the maximum is reached when the cone is vertical with the top pointing down. This observation remains valid in the overall Rayleigh number range. The average Nusselt number enhancement varies between 20 and 70%, according on the considered cavity's aspect ratio. This study complements a recent one restricted to the case of a cone whose horizontal base is located at the bottom, being 0.2 the aspect ratio of the enclosure. |
| first_indexed | 2024-03-13T06:36:56Z |
| format | Article |
| id | doaj.art-540495404d7b46c987fd3e53847463a9 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-03-13T06:36:56Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-540495404d7b46c987fd3e53847463a92023-06-09T04:27:53ZengElsevierCase Studies in Thermal Engineering2214-157X2023-07-0147103026Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parametersN. Alilat0F. Sastre1A. Martín-Garín2A. Velazquez3A. Baïri4Université de Paris, Laboratoire Thermique Interfaces Environnement (LTIE), EA 4415, 50, Rue de Sèvres, F-92410, Ville d’Avray, France; Corresponding author.Polytechnic University of Madrid, Department of Fluid Mechanics and Aerospace Propulsion, Plaza Cardenal Cisneros 3, 28040, Madrid, SpainUniversidad del Pais Vasco UPV/EHU, ENEDI Research Group, Plaza Europa 1, E-20018, Donostia-San Sebastián, SpainPolytechnic University of Madrid, Department of Fluid Mechanics and Aerospace Propulsion, Plaza Cardenal Cisneros 3, 28040, Madrid, SpainUniversité de Paris, Laboratoire Thermique Interfaces Environnement (LTIE), EA 4415, 50, Rue de Sèvres, F-92410, Ville d’Avray, FranceHeat transfer around a conical antenna is quantified in this work. Cooling of this active electronic component is ensured by a medium of high porosity saturated by a H2O–Cu nanofluid with a volume fraction varying between 0% and 5%. The ratio between the thermal conductivity of the porous materials and that of the water (base fluid) ranges from 4 to 41.2, the null value corresponding to a heat transfer without porous media (only nanofluid). The conical enclosure's aspect ratio varies in the 0.2–0.6 range, being its base inclined between 0° (horizontal base with cone's top oriented upwards) and 180° range (horizontal base with cone's top oriented downwards). The associated Rayleigh number varies within the 3.32x105-6.74x107 range. Heat transfer by natural convection is quantified for any configuration combining these five parameters and presented via a correlation allowing determination of the average Nusselt number. This study shows that heat transfer increases when the cone is tilted. For a given aspect ratio, the maximum is reached when the cone is vertical with the top pointing down. This observation remains valid in the overall Rayleigh number range. The average Nusselt number enhancement varies between 20 and 70%, according on the considered cavity's aspect ratio. This study complements a recent one restricted to the case of a cone whose horizontal base is located at the bottom, being 0.2 the aspect ratio of the enclosure.http://www.sciencedirect.com/science/article/pii/S2214157X23003325Natural convectionInclined enclosureH2O–Cu nanofluidElectronicsHome automationPorous media |
| spellingShingle | N. Alilat F. Sastre A. Martín-Garín A. Velazquez A. Baïri Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parameters Case Studies in Thermal Engineering Natural convection Inclined enclosure H2O–Cu nanofluid Electronics Home automation Porous media |
| title | Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parameters |
| title_full | Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parameters |
| title_fullStr | Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parameters |
| title_full_unstemmed | Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parameters |
| title_short | Heat transfer in a conical gap using H2O–Cu nanofluid and porous media. Effects of the main physical parameters |
| title_sort | heat transfer in a conical gap using h2o cu nanofluid and porous media effects of the main physical parameters |
| topic | Natural convection Inclined enclosure H2O–Cu nanofluid Electronics Home automation Porous media |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X23003325 |
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