ТЕПЛОГІДРАВЛІЧНА ЕФЕКТИВНІСТЬ ОДНО- ТА ДВОРЯДНОГО ПУЧКА ЦИЛІНДРІВ ЗІ СПІРАЛЬНОЮ КАНАВКОЮ НА ЗОВНІШНІЙ ПОВЕРХНІ ПРИ ПОПЕРЕЧНОМУ ОБТІКАННІ ПОТОКОМ ПОВІТРЯ
The results of experimental study of thermohydraulic performance of a single- and double-row of bundle of round cylinders with screw groove on the external surface at the air cross-flow are presented. The analysis was performed at the Reynolds number range from 6800 to 12000. For a single-row bundle...
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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/485 |
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| Journal Title: | Thermophysics and Thermal Power Engineering |
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Thermophysics and Thermal Power Engineering| Summary: | The results of experimental study of thermohydraulic performance of a single- and double-row of bundle of round cylinders with screw groove on the external surface at the air cross-flow are presented. The analysis was performed at the Reynolds number range from 6800 to 12000. For a single-row bundle the Reynolds Analogy Factor is more than unity for all Reynolds numbers studied, while for the double-row of cylinders it is over the inity at ReD<10000. The high thermohydraulic performance is due to the formation of the «interwined vortex structures» in the back cylinder zone. The obtained results show that when using heat exchange surfaces with spiral grooves it is necessary to prefer a beam of cylinders with an asymmetric arrangement of grooves. If the positions of the cylinders with grooves on their surface are identical, vortices from adjacent cylinders may interfere with each other in small steps of their placement in the beam. This may be the reason for the advantage of heat transfer in cylindrical surfaces with one-west grooves over similar surfaces with two-west. |
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