ЗАСТОСУВАННЯ ЗАГЛИБЛЕНЬ ТА ГВИНТОВИХ КАНАВОК НА ЗОВНІШНІЙ ПОВЕРХНІ ТРУБ ДЛЯ ПІДВИЩЕННЯ ТЕПЛОГІДРАВЛІЧНОЇ ЕФЕКТИВНОСТІ ТРУБНИХ ПУЧКІВ ПРИ ПОПЕРЕЧНОМУ ОБТІКАННІ
The flow structure and thermo-hydraulic efficiency of cross flow of tube bundles with dimples and helical grooves have been analyzed. The Reynolds number range (103-104) was typical for industrial heat exсhangers. It was found that dimples and grooves decrease scientifically the cylinder wake area a...
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| Date: | 2022 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | Ukrainian |
| Published: |
Institute of Engineering Thermophysics of NAS of Ukraine
2022
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| Online Access: | https://ihe.nas.gov.ua/index.php/journal/article/view/497 |
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| Journal Title: | Thermophysics and Thermal Power Engineering |
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Thermophysics and Thermal Power Engineering| Summary: | The flow structure and thermo-hydraulic efficiency of cross flow of tube bundles with dimples and helical grooves have been analyzed. The Reynolds number range (103-104) was typical for industrial heat exсhangers. It was found that dimples and grooves decrease scientifically the cylinder wake area and reduces the hydraulic losses. The heat transfer augmentation in five-row tube bundle by dimples is 35-40% while pressure drop increase by 10-15%. The hydraulic resistance of two-row bundle of tube with helical grooves is 20% lower than that of a smooth tube bundle, while heat transfer augmentation is absent. The value of Reynolds analogy factor for tube bundles with dimples and helical grooves exceeds unity. The high thermo-hydraulic efficiency of tube bundles with dimples and helical grooves, allows us to recommend it for practical use in the development of modern heat exchange equipment of the tubular type. |
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