https://orcid.org/0000-0001-9497-2406
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ABSTRACT
A two-dimensional numerical study of the crossflow past a staggered cylindrical tube bank with multiple splitter plates attached behind the tube was performed. Simulations were conducted by keeping the central splitter plate’s length equal to the tube diameter while varying the lengths of the other two splitter plates positioned at the top and bottom of the central one. The results were validated by means of a grid independency study and via comparison with available experimental and numerical studies in the open literature. The Nusselt number, friction factor (f), and thermal performance factor (η) variations at length ratios to tube diameter ranging from 0.1 to 1 were investigated as a function of the Reynolds number between 5500 and 14,500. The friction factor was found to be around 0.25 at low length ratio case where it increased up to 2.4 at high length ratios on average within the Reynolds number range investigated. The Nusselt number was found to be higher for all the length ratio values when compared with the use of one splitter plate, and it showed an increasing trend along with the increasing lengths of the two additional splitters. It increased from 81 to 155 on average within the Reynolds number range investigated due to the additional splitter plates. The η for the tube with additional splitters that had a length ratio of 0.4 was calculated as 1.42, which was an average of 13% higher when compared with the one splitter plate case that showed a thermal performance factor equal to 1.26. This length ratio was determined to be optimum based on the highest thermal performance factor and the increase of 35% and 8% in the Nusselt number when compared with the bare tubes and the one plate case, respectively.
Nomenclature
| A | = | area |
| BT | = | bare tube |
| D | = | diameter |
| f | = | friction factor |
| h | = | heat transfer coefficient |
| H | = | height |
| L | = | length |
| k | = | thermal conductivity |
| Nu | = | Nusselt number |
| P | = | pressure |
| Q | = | heat transfer rate |
| Re | = | Reynolds number |
| SD | = | diagonal pitch |
| SL | = | longitudinal pitch |
| ST | = | transverse pitch |
| SP | = | splitter plate |
| Ts | = | surface temperature |
| TA | = | air temperature |
| T | = | temperature |
| V | = | velocity |
| Vin | = | upstream velocity |
| Vmax | = | maximum velocity |
| ρ | = | density |
| μ | = | dynamic viscosity |
| η | = | thermal performance factor |
Acknowledgements
The author gratefully acknowledges the support provided by the Tubitak Rail Transport Technologies Institute (TUBITAK RUTE).
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Ayhan Nazmi İlikan
Ayhan Nazmi İlikan got his B.Sc. degree as a mechanical engineer from Istanbul Technical University in 2006. He got his M.Sc. and Ph.D. degrees in heat transfer and fluid dynamics from the same university in 2008 and 2014, respectively. Furthermore, he graduated from von Karman Institute for Fluid Dynamics, Turbomachinery and Propulsion Department, Master-after-Master Programme with an honour degree in 2009. He worked as an assistant professor at Isik University, between 2014 and 2016. He has been working as a chief researcher at The Scientific and Technological Research Council of Turkey (TUBITAK) Rail Transport Technologies Institute (RUTE) since 2016.