Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger
Heat transfer and overall heat transfer in a double pipe heat exchanger fitted with twisted-tape elements and titanium dioxide nanofluid were studied experimentally. The inner and outer diameters of the inner tube were 8 and 16 mm, respectively, and cold and hot water were used as working fluids in...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Journal of Engineering |
| Online Access: | http://dx.doi.org/10.1155/2014/920970 |
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| author | Heydar Maddah Reza Aghayari Morshed Farokhi Shabnam Jahanizadeh Khatere Ashtary |
| author_facet | Heydar Maddah Reza Aghayari Morshed Farokhi Shabnam Jahanizadeh Khatere Ashtary |
| author_sort | Heydar Maddah |
| collection | DOAJ |
| description | Heat transfer and overall heat transfer in a double pipe heat exchanger fitted with twisted-tape elements and titanium dioxide nanofluid were studied experimentally. The inner and outer diameters of the inner tube were 8 and 16 mm, respectively, and cold and hot water were used as working fluids in shell side and tube side. The twisted tapes were made from aluminum sheet with tape thickness (d) of 1 mm, width (W) of 5 mm, and length of 120 cm. Titanium dioxide nanoparticles with a diameter of 30 nm and a volume concentration of 0.01% (v/v) were prepared. The effects of temperature, mass flow rate, and concentration of nanoparticles on the overall heat transfer coefficient, heat transfer changes in the turbulent flow regime Re≥2300, and counter current flow were investigated. When using twisted tape and nanofluid,
heat transfer coefficient was about 10 to 25 percent higher than when they were not used. It was also observed that the heat
transfer coefficient increases with operating temperature and mass flow rate. The experimental results also showed that 0.01% TiO2/water nanofluid with twisted tape has slightly higher friction factor and pressure drop when compared to 0.01% TiO2/water nanofluid without twisted tape. The empirical correlations proposed for friction factor are in good agreement with the experimental data. |
| format | Article |
| id | doaj-art-117f3bd6836649fcae2bd078afc98639 |
| institution | Kabale University |
| issn | 2314-4904 2314-4912 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Engineering |
| spelling | doaj-art-117f3bd6836649fcae2bd078afc986392025-02-03T01:32:11ZengWileyJournal of Engineering2314-49042314-49122014-01-01201410.1155/2014/920970920970Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat ExchangerHeydar Maddah0Reza Aghayari1Morshed Farokhi2Shabnam Jahanizadeh3Khatere Ashtary4Department of Chemistry, Sciences Faculty, Islamic Azad University, Arak Branch, Arak, IranDepartment of Chemistry, Sciences Faculty, Islamic Azad University, Arak Branch, Arak, IranDepartment of Chemical Engineering, Islamic Azad University, Mahshahr Branch, Mahshahr, IranDepartment of Chemistry, Sciences Faculty, Islamic Azad University, Arak Branch, Arak, IranDepartment of Chemistry, Islamic Azad University, Saveh Branch, Saveh 39197-15179, IranHeat transfer and overall heat transfer in a double pipe heat exchanger fitted with twisted-tape elements and titanium dioxide nanofluid were studied experimentally. The inner and outer diameters of the inner tube were 8 and 16 mm, respectively, and cold and hot water were used as working fluids in shell side and tube side. The twisted tapes were made from aluminum sheet with tape thickness (d) of 1 mm, width (W) of 5 mm, and length of 120 cm. Titanium dioxide nanoparticles with a diameter of 30 nm and a volume concentration of 0.01% (v/v) were prepared. The effects of temperature, mass flow rate, and concentration of nanoparticles on the overall heat transfer coefficient, heat transfer changes in the turbulent flow regime Re≥2300, and counter current flow were investigated. When using twisted tape and nanofluid, heat transfer coefficient was about 10 to 25 percent higher than when they were not used. It was also observed that the heat transfer coefficient increases with operating temperature and mass flow rate. The experimental results also showed that 0.01% TiO2/water nanofluid with twisted tape has slightly higher friction factor and pressure drop when compared to 0.01% TiO2/water nanofluid without twisted tape. The empirical correlations proposed for friction factor are in good agreement with the experimental data.http://dx.doi.org/10.1155/2014/920970 |
| spellingShingle | Heydar Maddah Reza Aghayari Morshed Farokhi Shabnam Jahanizadeh Khatere Ashtary Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger Journal of Engineering |
| title | Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger |
| title_full | Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger |
| title_fullStr | Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger |
| title_full_unstemmed | Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger |
| title_short | Effect of Twisted-Tape Turbulators and Nanofluid on Heat Transfer in a Double Pipe Heat Exchanger |
| title_sort | effect of twisted tape turbulators and nanofluid on heat transfer in a double pipe heat exchanger |
| url | http://dx.doi.org/10.1155/2014/920970 |
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